Updating Old Airtronics Eloy Marez FREQUENCY SCANNER IpIIIII Dont despair have Airtronics Scanner original 72-75 MHz frequencies mods described article can adapt new channels came use last year THIS UNIT has become common sight contest frequency control tables rightfully provides muchneeded service price well within budget small clubs some individuals However recent assign ment first batch newlyreleased frequencies has partly entirely obsoleted older fine piece equipment number simple changes can made permit scanner continue work new future frequencies fact covers seven frequencies time now have 18 available much limiting factor hard conceive situations necessary fly planes given time have pleasure meeting Airtronics RC Frequency Scanner allow introduce scanner small 45 x 45 x 175-in self-contained frequency moni tor covers seven initially-assigned 72-75 MHz frequencies automatically scans band providing both visual aural indication signal being pres ent frequencies visual indicator red LED stays lit oc cupied frequency scanning con tinues unit can also placed manual control non-scan monitoring selected frequency volume control provided ample volume available nearby monitoring meter indicates relative signal strength 32-in collapsible whip antenna folds over lays across top cabinet Left The original Airtronics RC Frequency Scannerslightly outdated obsolete article tells may simply modi fled work new channels Top Right necessary crystals available Airtronics Shown crystals molded plastic caps marked channel identification Above Right Crystal sockets smali crys tals easiiy obtained Source both types shown required herein described updates inciuded text Left The crystal bank originally seen within scanner top rear view rear scanner Donom 720W MHZ crystal first left 75640 MHz crystal last right Right Bottom view printed circuit board showing crystal connections Note seven identical sections Arrows indicate lands crystals soldered 76 Model Aviation storage transportation Airtronics Scanner can operated either internal four-6ell Ni-Cd alkaline AA battery provided external 12volt supply latter cable furnished equipped cigarette lighter plug end coaxial power plug other mates matching receptacle rear panel Extensive volt age regulation usedfirst reduce 12 volts used further power crystal oscillat6rs some other internal circuit- ry latter will always receive exactly required voltage regardless supply low batteries requirement maximum frequency stability au dio amplifier works off unregulated voltage its operation will affected lower voltage available Ni-Cds 48 com pared alkalines 60 However relatively low er voltage resulting can compensated merely advancing vol ume control wee bit length operating time per set cells diffi cult calculate exactly scanner draws 50 milliamps during periods no-signal rising about 130 whei signal heard further af fected setting volume control Theoretically set properly charged Ni-Cds good condition could last long 10 hours low volume setting though would estimate five six hours realistic figure Alkalines can expected last 1 2 times longer desired scanner could operat ed directly external large capacity 32 NEW ANTENNA SUPPRT LOCATION DRILL 1/8 HOLE // FILE TO I/B SQUARE FOR ONBOTTOMOFN i7 SUPPORTN/ 32 SPEAKER & ANTENNA BASE MOUNTING HO LES #30 PLEXIGLASS COVER HOLES DRILL & TAP FOR #2 SCREW PLEXIGLASS COVER 1/4 LARGER THAN OPENING 11D EAKER L____1 CRYSTALS - S 15 . ii 32 1 2 Full-size drawing top section scanner caseshowing location new openings required described modifications Top/bottom sections interchanged full-replaceable-Orystai mods four-cell Ni-Cd pack case power cable could brought rear unit through grommet-protected hole mated directly plug internal batteries connect use 12-volt source contemplat ed socket provided its input could rewired accept four-cell external pack Merely disconnect insulate wires already socket connect red wire its center post point connection red wire ternal battery black wire should run outside contact socket connect black wire inter nal battery correct input polarity matching plug must also maintained Minor frequency changes Lets get Left Crystal bank shown crystal socket installed allow plug-in crystal changes easiest partial conversion Right Crystai bankwlth plug-in crystal itssocket Solution thetext installing seven side-by-side plug-in crystalswith identifying capsattached November 1984 77 Lower left rear bottom main printed circuit board showing location holes required mounting crystal socket assembly 470 II OUTTO SCANNER ANTENNA INPUT I5OO~ ANTENNA 47\ DPDT SWITCH Basic RF attenuator circuitand diagram showing can switched out double-pole double-throw switch what can update scanner operate new frequencies several options depending needs Fortunately circuitry will require changes 72-75 MHz fre quencies covered equal efficien -- GROUND cy Therefore changes made mostly mechanical should scare off first step obviously take unit apart top bottom halves come off after removing four sheet metal screws side rear cover comes off instance described later taking off top bottom enough now First individual needs change frequency able monitor new system small club needs cover couple new frequencies change simple just remove replace Remove old crystal replace new too have option can just solder new crystal place can install socket fast future replace ment field subject crystals crystal other name may sometimes rose other words crystals work correctly circuits something called overtones number times fundamental crystal fre quency multiplied arrive operating frequency case funda mental frequency crystal seems used overtone crystals spares box will work So safer order whatever need Airtronics dealer directly company stocks frequencies new old $750 Left Crystal socket board position over original crystal location within scanner installed small spacers 4-40 screws piastic washers nuts Right top updated scanner showing new plug-In crystal board plastic cover new location antenna mount speaker speaker grilicloth has added 78 Model Aviation Above Perforated electronic prototype board base new crystal socket board Use cutting drilling guide Note hole sizes Right Crystal socket board sockets taching wires place Solid wires will inserted soldered holes originally used seven basic frequency crystals Specify receiver crystal order prefer solder new decide old frequencies sacrificed locate its crystal within scanner referring originallyinstalled crystals lets think fre quencies covered 1 through 7 looking front frequency-indicating LEDs Thus 72080 No 1 forth 75640 No 7 Looking photo printed circuit board lower right rear note lands crystals soldered Note nine identical sections though seven have components installed position scanner crystal positions coincide frequency LEDs No 1 left etc However looking top scanner front inver sion No 7 now first left etc Anyway remove unwanted crystals Use small iron find rated 12 watts enough Dont use 4 5/8 4 5/8 9/16 CRYSTAL PIN HOLES 7/ 3 3/8 611 *-I 1/16 X5 Layout crystal holder board used crystal caddy sandwich box Make holder 3/16-In plastic Pin spacing 192 use dividers mark holes accurately soldering gun save working radiators gutters Use solder removal wicks such Radio Shack No 64-2090 remove solder crystal pins lands Continued page 172 Left Crystal holder insert described made 3/16-in plastic labeis cut Alrtronics frequency card tached Sonic-Tronics Crazy Tape Right Anyone crystal sandwich crystal holder shown mounted inside plastic snap-cover sandwich box system crystal location identification accomplished easily Au photographs author November 1984 79 Left Rear cover turned 180 allow lower relocation 1 2V put plug bottom pansi Above newiy-lnstaiied RF attenu ator switch per text Above scanner loses sensitivity first test batteries check tuning Arrows indicate 1 RF enveiope 2 detected output pickup pointson board NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling Item 13 shown Sheet 1 plans Install hook fuselage shown Detail Install #6 x %-in screw A6-in hole drilled earlierscrew until protrudes 1A-in screw will used stop hook down position Wrap solder length A2-in music wire elevator pushrod bend hold tail hook up position Trim end wire hook will drop elevator full-down position see Detail B Item 20 Loop rubberband around hook engage screw extending round doubler Engage hook elevator pushrod recheck will drop full-down elevator Finishing Remove engine hook tail gear Cover wings silkspan equivalent material Paint upper part fuselage blue-gray lower part light gray plan shows approximate line separates colors upper part wing blue-gray bottom light gray canopy windows white Apply white fuselage lettering star insignias latter red white blue colors Apply 1 oz stick-on lead weight underside right wing tip stall engine fuel tank hook tail gear Check model balances within / center gravity CG loca tion shown Sheet 1 plans Apply nose tail weight needed achieve desired balance point Flying little Dauntless very stable flight lifts off deck very quickly settles down smooth high-speed flight Speeds 60 70 mph easily attained have flown Dauntless 70 mph take first place club contests Slowing down Dauntless lowspeed flight quite uneventful little ship requires small amount upelevator hold reduced speed practice can really get nose up correct throttle control being applied Landing best part Just pick Z495 $3295 $3995 Dealers inquiries invited spot chop throttle let settle Its easy make three-point landings model hope enjoy flying 15 Dauntless much have Happy landings ScannerlMarez Continued page 79 quickly possible crystals damaged soldering de-soldering like electronic components dont really like long sustained applica tions high temperatures Fortunately pins installed crystals cut off can re-use sockets after cleaning solder off Assuming interested couple new frequencies may opt solder new crystals point However interest cludes sockets should first talk about crystals little bit First former two types sockets available has same pin diameter spacing crystals will drop right hole printed circuit board Another has wide flat pins wider spacing will Both available Kraft Systems boardmounted type need point Part No 120-074 $300 other type use will described later Part No 120-141K $100 Small crystal sockets such something rarity dont bother looking Radio Shack small electronics supply houses Back crystals again recom mendation get Airtronics insist different source need HC-25/U type accept HC 18/U same size has long wires instead pins unless definitely intend solder Airtronics crystals come nice neat molded plastic cap identified colors channel numbers tremendous help especially have decided plug-in field changes ever cap too wide allow seven plug-in crystals space provided PC board can install sockets ProTt MO MOLDED STRONG -METAL FRAMEGREAT GIFT 5 FOAM FILLED Transmitter ection Case X PRICE $35 Include Shipping & Kondling US CA re odd 6% Send check yr 0 5 ERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 other position four plug-ins enough satisfy requirements can trim lip sides th molded cap narrows enough allow seven side-by-side crystals However previous men tion plug-in crystals will still need remove top cover whenever fre quency change required too slow involved constant changes required scanner ing used active contest situa tion will get worse new frequencies phased have developed ultimate update will now described Full-house update Basically will stall support-mounted crystal socket board high enough permit easy crystal identification changes clear plastic window will provided checking installed crystals new board being larger space initially used original crystal circuitry will require relocation speaker antenna mount Dont put off scary-sounding things recommended changes still mainly mechanical no volved electronics changes being required Start taking off top bottom covers rear panel Unsolder wires speaker antenna connec tor remove 12-volt power input jack panel Using small iron solder wick remove seven crystals board clean solder completely off pins best done applying bit paste solder flux heat wiping off melt ed solder rag careful leave solder bridges board dur ing desoldening operation make crystal socket board youll need piece 1-in spacing elec tronic prototype perforated board prefer ably epoxy-based type cheaper phenolic board acceptable though does drill cut cleanly epoxy strong Cut size 14 x 32 holes shown photo Referring again photo note locations new holes drill indicated Note 14 crystal 172 Model Aviation xket holes drilled existing ole locations other two mounting oles located between already-existing oles Two holes have drilled scan er PC board adjacent initially stalled crystals Note diagram e exact location holes hole earest corner board will cut irough unused board land dont oncerned about innermost hole rill cut land large diode nd red wire connected little irgery required Remove iode completely off board tall opposite end completely down ne board land its bent ver lead soldered Resolder clip ntis wire red wire now soldered ne top diode lead thus making same riginal connections provides ecessary room spacer ne crystal socket board rests board supported 46-in spacers 4-40 rews through holes sockets required flat pin pe Kraft No 120-141K should istalled board time using ery small drop cyanoacrylate t wick up sockets pins nien folded inward secure erf board 1-in length unin ilated solid wire No 22 24 oldered socket pin per hoto Now mate two assemblies Hold socket board above scanner board tarting inside insert first wo wires connected socket nenter pair crystal pin holes Work ucceeding pair wires respec ive holes pair tweezers good ighting necessary requirements Push board place install Y6-in pacers 4-40 bolts tighten lace make sure wires uckle bend other nylon r fiber washer should used under -40 nut land side scanner oard provide insulation scan er found couple tall apacitors located just inboard rystals installed directly board high enough inter rere new socket board run nto locate lands apacitors installed heat solder onnections push down board Lightly pull wire comes through board pair should equal length Solder clip off ex ess wire clean off remaining solder flux alcohol stiff brush cheap -in brush bristles cut off V2-in length ideal such purposes point good idea recon nect speaker battery plug crystals check scanner normal operation Note again looking scanner normal operators view indicating LEDs read left right order ascending frequen cy crystal location however right left other words crystal 72080 first LED left last crystal line right Since frequencies indicated front panel will no longer apply cases best re-label 1-7 merely help maintain relationship between installed crystals LEDs still modification consider case far wish go well help finish off will now remount antenna anten na support speaker make ac cess hole crystals First remove hardware top cover Once clean consider installing stick-on bolt-on rubber foot corner since now holding bottom scanner Yep switching top bottom holes original top lend themselves new open ings required Refer sketch dimensions locations new openings go Unfortunately covers aluminum steel however particularly hard can cut fine-tooth blade Dremel saw finished off files group has active Ham electronics hobbyist ask him has Greenlee chassis punches screw-operated devices made just purpose cut accurate clean distor tion-free holes used 1-in round punch speaker hole. rectangle made 1-in square punch used both ends middle sawed filed out After sheet metal work done grille cloth must installed over speaker hole Any light weight black material will can secured place adhesive Remount speaker antenna antenna support latter will require small square hole will see once has removed its original loca tion can reattached silicone rubber clear plastic top made A-in Plexiglas absolute re quirement does add touch class held place two No 2 machine screws tapped top contest use top left screw removed cover pivoted out way Reconnect antenna speaker wires button up go look nearest contest Signal Attenuator promised mod have al ready used Airtronics Scanner close proximity flight line know sometimes subject swamping strong signals certain frequencies will cause er ratic operation scanner should ac tually used farther away flight line practical way contests have run problem also recognized Mr Bill Hersh berger able persons provided expertise AMA dur ing recent new frequency negotiations Bill has developed signal attenuator have incorporated switch in/out feature updated scanner will need three resistors switch latter installed rear cover scanner Notice weve turned cover around 180 degrees 12-volt input socket has moved way bottom attenuator switch located over switch used C&K DPDT Model No 1201 small high-quality switch ideal RC applications However cant obtain locally small DPDT slide toggle switch fits Continued page 176 November1984 173 ScannerlMare Continued page 173 available space will Notice sketch schematic wiring dia grams attenuator Install switch out circuit High knob down Low About 30dB attenuation obtained use allow monitor strong nearby signals switch attenuator collapse antenna Remember though makes scanner less sensitive weak out-of-the-area inter ference Periodically activity permits attenuator should switched out antenna extended check possible incoming interference Crystal Holder Now youve got -SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE N ERNA ONA CATALOG48500 MC KENZIE HWY $300VIDA OREGON 97488 SILICONE tr ID 062 092 125 U S POST 10 foot coils TUBING S/coil 235 265 3 2554 CO L [ LARRY DODGE ERG INC 10210 MANNINGSTILLWATER MN 5508 NOSTALGIC FLYING NEW VERSION OF ORIGINAL CHRISTMAS CARD TRU-FLITE MODEL FROM THE PAST reje When,. Pesos to, 40s Solids isto en eSeol,telv SeeottI tflee Model ttStOoOeI I5eo5 ~ oo~s Note usa GeetssteetetoIy dose 0e 24 Istshensekpe3 p2495 Box S2mn Rosaville MI 48066 TORK-STARTER $2995 Charger 11 tV 220V 1 2V Fast Charger $2095 Without Charger CHARGERS $1295 Charger Only Ill OV 220V 1 2V Past Charger 301 464-2260 nice new modern plug-in crystal attenu ated scanner youll getting complete set crystals go youll need way store transport identify May suggest Deluxe RC Crystal Caddy after brown bag has no class caddy started life off ubiqui tous plastic sandwich box snap-on cover nearest food store come sizes shapes choice Superseal #3427 nationally avail able however similar will onehas inside dimension 5%-in square insert based use another size merely adjust outside dimensions insert ac tual crystal holder youll need piece plastic least Y16-in thick Measure mark off material per diagram drill 36 holes required #56 bit exact crystal pin spacing 192 rather difficult lay out fractional scale accurate set pair dividers right dimen sion using crystal pins guide mark hole spacing labels crystal holder cut Airtronics Frequency Card can have asking order crystals Apply some thin double-sided tape rear card before cut out individual labels find Sonic-Tronics Crazy Tape excellent other modeling chores Keep protective covering until youve trimmed labels size trimmed drilled labeled crystal holder secured case sticky tape piece foam rubber attached cover keep crystals place during drive field Neat huh Cars boats Basically weve treated update aircraft frequencies since primary RC interest However scanner works equally well 75 MHz car boat frequencies can convert channels either methods described Air tronics does have Crystals hand same price correct labels found other side card Tuning future time feel scanner losing sensitivity first thing after verifying batteries good shape check tuning photos y5TE Easy use part no mix paint system No mixing No waiting Fast drying extremely fuel proof Formulated just modeler covers surfaces paints resins Send free instruction brochure BUY IT YOULL LIKE IT SIG MFG COMontezuma IA 50171 shows proper spots PC board whici can pick up modulated waveform thl detected output Tuning should done tin middle band using antenna-down trans mitter some distance away signal source Adjust RF IF transformers maxi mum signal scope Physically lo cated line starting vicinity antennl input towards center unit Crystals once again Airtronics has graciousl agreed furnish sets new frequency crys tals special prices duly registered plane boat car clubs Included also packagt will some molded crystal caps bt used originally-installed crystals whict have Write Airtronics curren information meantime isnt nice know thal something own thought ha obsoleted technology can updated tc fly again Parts update As writing two types ol crystal sockets erroneously listed HC-1S crystals must HC-25 made former cataloged Semi conductor Surplus 2822 North 32nd St Unit 1 Phoenix AZ 85008 priced 504 actually two $100 have sia minimum also always list lot useful items getting order level difficult Ask check catalog Scale WClWlschers Continued page 91 90 four-stroke Air made its exit through dummy exhaust stacks method could successful Englands cool weather high temperatures existed during three flying days Le Bourget Mick cooling problems noticeable loss engine rpm engine spaced back 15-in shaft extension model weight 129 lb meant engines full output needed maintain flying speed Mick con centrated using enough power result speed scalelike Features model handmade aluminum wheels tires molded Devcon RTV compound paper covering over balsa structure Hobbypoxy finish over dope-and-talc filler Brian Taylors Bristol Beaufighter second-highest static score along flight reasonably high quality As can expected Brian model exceptional Surprisingly 176 Model Aviation r Rk MFG OF NI STARTER $2995 Charger PLEASE SPECIFY WHICH CHARGER WHEN ORDERING TORK-STARTER revolutionary concept power 15V glow plugs model cars boats air planes using glow fuel engines TORK-STARTERITMI has steel wrench strong enough reduce compression easier starting ft supplies power vhII dolag comes new CIlO charger has LEO indicate unit charging also has removable T handle can used Torque amplifier Over 50 consecutive starts full charge rechargeable hundreds times Clips Onto plug positive connection Send ad along pre-paymens receive free shiooino handlino 12721 HASKELL LANE BOWIE MARYLAND 20716 L STICK&TISSUEMODELSFOAM SCALE ARE GREATMODELS new sheet foam bailds easier-Peanuts difference youll enloyat& Up lowest cost Several scale de signs available antique des sic warbirds 6 homebuilts Send $1O0forlatestplanslistfoam-samples discount coupon etcflex 652AM GETAFREECO-2MOTORSt CreSt Falls SW 54024
Edition: Model Aviation - 1984/11
Page Numbers: 76, 77, 78, 79, 172, 173, 176
Updating Old Airtronics Eloy Marez FREQUENCY SCANNER IpIIIII Dont despair have Airtronics Scanner original 72-75 MHz frequencies mods described article can adapt new channels came use last year THIS UNIT has become common sight contest frequency control tables rightfully provides muchneeded service price well within budget small clubs some individuals However recent assign ment first batch newlyreleased frequencies has partly entirely obsoleted older fine piece equipment number simple changes can made permit scanner continue work new future frequencies fact covers seven frequencies time now have 18 available much limiting factor hard conceive situations necessary fly planes given time have pleasure meeting Airtronics RC Frequency Scanner allow introduce scanner small 45 x 45 x 175-in self-contained frequency moni tor covers seven initially-assigned 72-75 MHz frequencies automatically scans band providing both visual aural indication signal being pres ent frequencies visual indicator red LED stays lit oc cupied frequency scanning con tinues unit can also placed manual control non-scan monitoring selected frequency volume control provided ample volume available nearby monitoring meter indicates relative signal strength 32-in collapsible whip antenna folds over lays across top cabinet Left The original Airtronics RC Frequency Scannerslightly outdated obsolete article tells may simply modi fled work new channels Top Right necessary crystals available Airtronics Shown crystals molded plastic caps marked channel identification Above Right Crystal sockets smali crys tals easiiy obtained Source both types shown required herein described updates inciuded text Left The crystal bank originally seen within scanner top rear view rear scanner Donom 720W MHZ crystal first left 75640 MHz crystal last right Right Bottom view printed circuit board showing crystal connections Note seven identical sections Arrows indicate lands crystals soldered 76 Model Aviation storage transportation Airtronics Scanner can operated either internal four-6ell Ni-Cd alkaline AA battery provided external 12volt supply latter cable furnished equipped cigarette lighter plug end coaxial power plug other mates matching receptacle rear panel Extensive volt age regulation usedfirst reduce 12 volts used further power crystal oscillat6rs some other internal circuit- ry latter will always receive exactly required voltage regardless supply low batteries requirement maximum frequency stability au dio amplifier works off unregulated voltage its operation will affected lower voltage available Ni-Cds 48 com pared alkalines 60 However relatively low er voltage resulting can compensated merely advancing vol ume control wee bit length operating time per set cells diffi cult calculate exactly scanner draws 50 milliamps during periods no-signal rising about 130 whei signal heard further af fected setting volume control Theoretically set properly charged Ni-Cds good condition could last long 10 hours low volume setting though would estimate five six hours realistic figure Alkalines can expected last 1 2 times longer desired scanner could operat ed directly external large capacity 32 NEW ANTENNA SUPPRT LOCATION DRILL 1/8 HOLE // FILE TO I/B SQUARE FOR ONBOTTOMOFN i7 SUPPORTN/ 32 SPEAKER & ANTENNA BASE MOUNTING HO LES #30 PLEXIGLASS COVER HOLES DRILL & TAP FOR #2 SCREW PLEXIGLASS COVER 1/4 LARGER THAN OPENING 11D EAKER L____1 CRYSTALS - S 15 . ii 32 1 2 Full-size drawing top section scanner caseshowing location new openings required described modifications Top/bottom sections interchanged full-replaceable-Orystai mods four-cell Ni-Cd pack case power cable could brought rear unit through grommet-protected hole mated directly plug internal batteries connect use 12-volt source contemplat ed socket provided its input could rewired accept four-cell external pack Merely disconnect insulate wires already socket connect red wire its center post point connection red wire ternal battery black wire should run outside contact socket connect black wire inter nal battery correct input polarity matching plug must also maintained Minor frequency changes Lets get Left Crystal bank shown crystal socket installed allow plug-in crystal changes easiest partial conversion Right Crystai bankwlth plug-in crystal itssocket Solution thetext installing seven side-by-side plug-in crystalswith identifying capsattached November 1984 77 Lower left rear bottom main printed circuit board showing location holes required mounting crystal socket assembly 470 II OUTTO SCANNER ANTENNA INPUT I5OO~ ANTENNA 47\ DPDT SWITCH Basic RF attenuator circuitand diagram showing can switched out double-pole double-throw switch what can update scanner operate new frequencies several options depending needs Fortunately circuitry will require changes 72-75 MHz fre quencies covered equal efficien -- GROUND cy Therefore changes made mostly mechanical should scare off first step obviously take unit apart top bottom halves come off after removing four sheet metal screws side rear cover comes off instance described later taking off top bottom enough now First individual needs change frequency able monitor new system small club needs cover couple new frequencies change simple just remove replace Remove old crystal replace new too have option can just solder new crystal place can install socket fast future replace ment field subject crystals crystal other name may sometimes rose other words crystals work correctly circuits something called overtones number times fundamental crystal fre quency multiplied arrive operating frequency case funda mental frequency crystal seems used overtone crystals spares box will work So safer order whatever need Airtronics dealer directly company stocks frequencies new old $750 Left Crystal socket board position over original crystal location within scanner installed small spacers 4-40 screws piastic washers nuts Right top updated scanner showing new plug-In crystal board plastic cover new location antenna mount speaker speaker grilicloth has added 78 Model Aviation Above Perforated electronic prototype board base new crystal socket board Use cutting drilling guide Note hole sizes Right Crystal socket board sockets taching wires place Solid wires will inserted soldered holes originally used seven basic frequency crystals Specify receiver crystal order prefer solder new decide old frequencies sacrificed locate its crystal within scanner referring originallyinstalled crystals lets think fre quencies covered 1 through 7 looking front frequency-indicating LEDs Thus 72080 No 1 forth 75640 No 7 Looking photo printed circuit board lower right rear note lands crystals soldered Note nine identical sections though seven have components installed position scanner crystal positions coincide frequency LEDs No 1 left etc However looking top scanner front inver sion No 7 now first left etc Anyway remove unwanted crystals Use small iron find rated 12 watts enough Dont use 4 5/8 4 5/8 9/16 CRYSTAL PIN HOLES 7/ 3 3/8 611 *-I 1/16 X5 Layout crystal holder board used crystal caddy sandwich box Make holder 3/16-In plastic Pin spacing 192 use dividers mark holes accurately soldering gun save working radiators gutters Use solder removal wicks such Radio Shack No 64-2090 remove solder crystal pins lands Continued page 172 Left Crystal holder insert described made 3/16-in plastic labeis cut Alrtronics frequency card tached Sonic-Tronics Crazy Tape Right Anyone crystal sandwich crystal holder shown mounted inside plastic snap-cover sandwich box system crystal location identification accomplished easily Au photographs author November 1984 79 Left Rear cover turned 180 allow lower relocation 1 2V put plug bottom pansi Above newiy-lnstaiied RF attenu ator switch per text Above scanner loses sensitivity first test batteries check tuning Arrows indicate 1 RF enveiope 2 detected output pickup pointson board NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling Item 13 shown Sheet 1 plans Install hook fuselage shown Detail Install #6 x %-in screw A6-in hole drilled earlierscrew until protrudes 1A-in screw will used stop hook down position Wrap solder length A2-in music wire elevator pushrod bend hold tail hook up position Trim end wire hook will drop elevator full-down position see Detail B Item 20 Loop rubberband around hook engage screw extending round doubler Engage hook elevator pushrod recheck will drop full-down elevator Finishing Remove engine hook tail gear Cover wings silkspan equivalent material Paint upper part fuselage blue-gray lower part light gray plan shows approximate line separates colors upper part wing blue-gray bottom light gray canopy windows white Apply white fuselage lettering star insignias latter red white blue colors Apply 1 oz stick-on lead weight underside right wing tip stall engine fuel tank hook tail gear Check model balances within / center gravity CG loca tion shown Sheet 1 plans Apply nose tail weight needed achieve desired balance point Flying little Dauntless very stable flight lifts off deck very quickly settles down smooth high-speed flight Speeds 60 70 mph easily attained have flown Dauntless 70 mph take first place club contests Slowing down Dauntless lowspeed flight quite uneventful little ship requires small amount upelevator hold reduced speed practice can really get nose up correct throttle control being applied Landing best part Just pick Z495 $3295 $3995 Dealers inquiries invited spot chop throttle let settle Its easy make three-point landings model hope enjoy flying 15 Dauntless much have Happy landings ScannerlMarez Continued page 79 quickly possible crystals damaged soldering de-soldering like electronic components dont really like long sustained applica tions high temperatures Fortunately pins installed crystals cut off can re-use sockets after cleaning solder off Assuming interested couple new frequencies may opt solder new crystals point However interest cludes sockets should first talk about crystals little bit First former two types sockets available has same pin diameter spacing crystals will drop right hole printed circuit board Another has wide flat pins wider spacing will Both available Kraft Systems boardmounted type need point Part No 120-074 $300 other type use will described later Part No 120-141K $100 Small crystal sockets such something rarity dont bother looking Radio Shack small electronics supply houses Back crystals again recom mendation get Airtronics insist different source need HC-25/U type accept HC 18/U same size has long wires instead pins unless definitely intend solder Airtronics crystals come nice neat molded plastic cap identified colors channel numbers tremendous help especially have decided plug-in field changes ever cap too wide allow seven plug-in crystals space provided PC board can install sockets ProTt MO MOLDED STRONG -METAL FRAMEGREAT GIFT 5 FOAM FILLED Transmitter ection Case X PRICE $35 Include Shipping & Kondling US CA re odd 6% Send check yr 0 5 ERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 other position four plug-ins enough satisfy requirements can trim lip sides th molded cap narrows enough allow seven side-by-side crystals However previous men tion plug-in crystals will still need remove top cover whenever fre quency change required too slow involved constant changes required scanner ing used active contest situa tion will get worse new frequencies phased have developed ultimate update will now described Full-house update Basically will stall support-mounted crystal socket board high enough permit easy crystal identification changes clear plastic window will provided checking installed crystals new board being larger space initially used original crystal circuitry will require relocation speaker antenna mount Dont put off scary-sounding things recommended changes still mainly mechanical no volved electronics changes being required Start taking off top bottom covers rear panel Unsolder wires speaker antenna connec tor remove 12-volt power input jack panel Using small iron solder wick remove seven crystals board clean solder completely off pins best done applying bit paste solder flux heat wiping off melt ed solder rag careful leave solder bridges board dur ing desoldening operation make crystal socket board youll need piece 1-in spacing elec tronic prototype perforated board prefer ably epoxy-based type cheaper phenolic board acceptable though does drill cut cleanly epoxy strong Cut size 14 x 32 holes shown photo Referring again photo note locations new holes drill indicated Note 14 crystal 172 Model Aviation xket holes drilled existing ole locations other two mounting oles located between already-existing oles Two holes have drilled scan er PC board adjacent initially stalled crystals Note diagram e exact location holes hole earest corner board will cut irough unused board land dont oncerned about innermost hole rill cut land large diode nd red wire connected little irgery required Remove iode completely off board tall opposite end completely down ne board land its bent ver lead soldered Resolder clip ntis wire red wire now soldered ne top diode lead thus making same riginal connections provides ecessary room spacer ne crystal socket board rests board supported 46-in spacers 4-40 rews through holes sockets required flat pin pe Kraft No 120-141K should istalled board time using ery small drop cyanoacrylate t wick up sockets pins nien folded inward secure erf board 1-in length unin ilated solid wire No 22 24 oldered socket pin per hoto Now mate two assemblies Hold socket board above scanner board tarting inside insert first wo wires connected socket nenter pair crystal pin holes Work ucceeding pair wires respec ive holes pair tweezers good ighting necessary requirements Push board place install Y6-in pacers 4-40 bolts tighten lace make sure wires uckle bend other nylon r fiber washer should used under -40 nut land side scanner oard provide insulation scan er found couple tall apacitors located just inboard rystals installed directly board high enough inter rere new socket board run nto locate lands apacitors installed heat solder onnections push down board Lightly pull wire comes through board pair should equal length Solder clip off ex ess wire clean off remaining solder flux alcohol stiff brush cheap -in brush bristles cut off V2-in length ideal such purposes point good idea recon nect speaker battery plug crystals check scanner normal operation Note again looking scanner normal operators view indicating LEDs read left right order ascending frequen cy crystal location however right left other words crystal 72080 first LED left last crystal line right Since frequencies indicated front panel will no longer apply cases best re-label 1-7 merely help maintain relationship between installed crystals LEDs still modification consider case far wish go well help finish off will now remount antenna anten na support speaker make ac cess hole crystals First remove hardware top cover Once clean consider installing stick-on bolt-on rubber foot corner since now holding bottom scanner Yep switching top bottom holes original top lend themselves new open ings required Refer sketch dimensions locations new openings go Unfortunately covers aluminum steel however particularly hard can cut fine-tooth blade Dremel saw finished off files group has active Ham electronics hobbyist ask him has Greenlee chassis punches screw-operated devices made just purpose cut accurate clean distor tion-free holes used 1-in round punch speaker hole. rectangle made 1-in square punch used both ends middle sawed filed out After sheet metal work done grille cloth must installed over speaker hole Any light weight black material will can secured place adhesive Remount speaker antenna antenna support latter will require small square hole will see once has removed its original loca tion can reattached silicone rubber clear plastic top made A-in Plexiglas absolute re quirement does add touch class held place two No 2 machine screws tapped top contest use top left screw removed cover pivoted out way Reconnect antenna speaker wires button up go look nearest contest Signal Attenuator promised mod have al ready used Airtronics Scanner close proximity flight line know sometimes subject swamping strong signals certain frequencies will cause er ratic operation scanner should ac tually used farther away flight line practical way contests have run problem also recognized Mr Bill Hersh berger able persons provided expertise AMA dur ing recent new frequency negotiations Bill has developed signal attenuator have incorporated switch in/out feature updated scanner will need three resistors switch latter installed rear cover scanner Notice weve turned cover around 180 degrees 12-volt input socket has moved way bottom attenuator switch located over switch used C&K DPDT Model No 1201 small high-quality switch ideal RC applications However cant obtain locally small DPDT slide toggle switch fits Continued page 176 November1984 173 ScannerlMare Continued page 173 available space will Notice sketch schematic wiring dia grams attenuator Install switch out circuit High knob down Low About 30dB attenuation obtained use allow monitor strong nearby signals switch attenuator collapse antenna Remember though makes scanner less sensitive weak out-of-the-area inter ference Periodically activity permits attenuator should switched out antenna extended check possible incoming interference Crystal Holder Now youve got -SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE N ERNA ONA CATALOG48500 MC KENZIE HWY $300VIDA OREGON 97488 SILICONE tr ID 062 092 125 U S POST 10 foot coils TUBING S/coil 235 265 3 2554 CO L [ LARRY DODGE ERG INC 10210 MANNINGSTILLWATER MN 5508 NOSTALGIC FLYING NEW VERSION OF ORIGINAL CHRISTMAS CARD TRU-FLITE MODEL FROM THE PAST reje When,. Pesos to, 40s Solids isto en eSeol,telv SeeottI tflee Model ttStOoOeI I5eo5 ~ oo~s Note usa GeetssteetetoIy dose 0e 24 Istshensekpe3 p2495 Box S2mn Rosaville MI 48066 TORK-STARTER $2995 Charger 11 tV 220V 1 2V Fast Charger $2095 Without Charger CHARGERS $1295 Charger Only Ill OV 220V 1 2V Past Charger 301 464-2260 nice new modern plug-in crystal attenu ated scanner youll getting complete set crystals go youll need way store transport identify May suggest Deluxe RC Crystal Caddy after brown bag has no class caddy started life off ubiqui tous plastic sandwich box snap-on cover nearest food store come sizes shapes choice Superseal #3427 nationally avail able however similar will onehas inside dimension 5%-in square insert based use another size merely adjust outside dimensions insert ac tual crystal holder youll need piece plastic least Y16-in thick Measure mark off material per diagram drill 36 holes required #56 bit exact crystal pin spacing 192 rather difficult lay out fractional scale accurate set pair dividers right dimen sion using crystal pins guide mark hole spacing labels crystal holder cut Airtronics Frequency Card can have asking order crystals Apply some thin double-sided tape rear card before cut out individual labels find Sonic-Tronics Crazy Tape excellent other modeling chores Keep protective covering until youve trimmed labels size trimmed drilled labeled crystal holder secured case sticky tape piece foam rubber attached cover keep crystals place during drive field Neat huh Cars boats Basically weve treated update aircraft frequencies since primary RC interest However scanner works equally well 75 MHz car boat frequencies can convert channels either methods described Air tronics does have Crystals hand same price correct labels found other side card Tuning future time feel scanner losing sensitivity first thing after verifying batteries good shape check tuning photos y5TE Easy use part no mix paint system No mixing No waiting Fast drying extremely fuel proof Formulated just modeler covers surfaces paints resins Send free instruction brochure BUY IT YOULL LIKE IT SIG MFG COMontezuma IA 50171 shows proper spots PC board whici can pick up modulated waveform thl detected output Tuning should done tin middle band using antenna-down trans mitter some distance away signal source Adjust RF IF transformers maxi mum signal scope Physically lo cated line starting vicinity antennl input towards center unit Crystals once again Airtronics has graciousl agreed furnish sets new frequency crys tals special prices duly registered plane boat car clubs Included also packagt will some molded crystal caps bt used originally-installed crystals whict have Write Airtronics curren information meantime isnt nice know thal something own thought ha obsoleted technology can updated tc fly again Parts update As writing two types ol crystal sockets erroneously listed HC-1S crystals must HC-25 made former cataloged Semi conductor Surplus 2822 North 32nd St Unit 1 Phoenix AZ 85008 priced 504 actually two $100 have sia minimum also always list lot useful items getting order level difficult Ask check catalog Scale WClWlschers Continued page 91 90 four-stroke Air made its exit through dummy exhaust stacks method could successful Englands cool weather high temperatures existed during three flying days Le Bourget Mick cooling problems noticeable loss engine rpm engine spaced back 15-in shaft extension model weight 129 lb meant engines full output needed maintain flying speed Mick con centrated using enough power result speed scalelike Features model handmade aluminum wheels tires molded Devcon RTV compound paper covering over balsa structure Hobbypoxy finish over dope-and-talc filler Brian Taylors Bristol Beaufighter second-highest static score along flight reasonably high quality As can expected Brian model exceptional Surprisingly 176 Model Aviation r Rk MFG OF NI STARTER $2995 Charger PLEASE SPECIFY WHICH CHARGER WHEN ORDERING TORK-STARTER revolutionary concept power 15V glow plugs model cars boats air planes using glow fuel engines TORK-STARTERITMI has steel wrench strong enough reduce compression easier starting ft supplies power vhII dolag comes new CIlO charger has LEO indicate unit charging also has removable T handle can used Torque amplifier Over 50 consecutive starts full charge rechargeable hundreds times Clips Onto plug positive connection Send ad along pre-paymens receive free shiooino handlino 12721 HASKELL LANE BOWIE MARYLAND 20716 L STICK&TISSUEMODELSFOAM SCALE ARE GREATMODELS new sheet foam bailds easier-Peanuts difference youll enloyat& Up lowest cost Several scale de signs available antique des sic warbirds 6 homebuilts Send $1O0forlatestplanslistfoam-samples discount coupon etcflex 652AM GETAFREECO-2MOTORSt CreSt Falls SW 54024
Edition: Model Aviation - 1984/11
Page Numbers: 76, 77, 78, 79, 172, 173, 176
Updating Old Airtronics Eloy Marez FREQUENCY SCANNER IpIIIII Dont despair have Airtronics Scanner original 72-75 MHz frequencies mods described article can adapt new channels came use last year THIS UNIT has become common sight contest frequency control tables rightfully provides muchneeded service price well within budget small clubs some individuals However recent assign ment first batch newlyreleased frequencies has partly entirely obsoleted older fine piece equipment number simple changes can made permit scanner continue work new future frequencies fact covers seven frequencies time now have 18 available much limiting factor hard conceive situations necessary fly planes given time have pleasure meeting Airtronics RC Frequency Scanner allow introduce scanner small 45 x 45 x 175-in self-contained frequency moni tor covers seven initially-assigned 72-75 MHz frequencies automatically scans band providing both visual aural indication signal being pres ent frequencies visual indicator red LED stays lit oc cupied frequency scanning con tinues unit can also placed manual control non-scan monitoring selected frequency volume control provided ample volume available nearby monitoring meter indicates relative signal strength 32-in collapsible whip antenna folds over lays across top cabinet Left The original Airtronics RC Frequency Scannerslightly outdated obsolete article tells may simply modi fled work new channels Top Right necessary crystals available Airtronics Shown crystals molded plastic caps marked channel identification Above Right Crystal sockets smali crys tals easiiy obtained Source both types shown required herein described updates inciuded text Left The crystal bank originally seen within scanner top rear view rear scanner Donom 720W MHZ crystal first left 75640 MHz crystal last right Right Bottom view printed circuit board showing crystal connections Note seven identical sections Arrows indicate lands crystals soldered 76 Model Aviation storage transportation Airtronics Scanner can operated either internal four-6ell Ni-Cd alkaline AA battery provided external 12volt supply latter cable furnished equipped cigarette lighter plug end coaxial power plug other mates matching receptacle rear panel Extensive volt age regulation usedfirst reduce 12 volts used further power crystal oscillat6rs some other internal circuit- ry latter will always receive exactly required voltage regardless supply low batteries requirement maximum frequency stability au dio amplifier works off unregulated voltage its operation will affected lower voltage available Ni-Cds 48 com pared alkalines 60 However relatively low er voltage resulting can compensated merely advancing vol ume control wee bit length operating time per set cells diffi cult calculate exactly scanner draws 50 milliamps during periods no-signal rising about 130 whei signal heard further af fected setting volume control Theoretically set properly charged Ni-Cds good condition could last long 10 hours low volume setting though would estimate five six hours realistic figure Alkalines can expected last 1 2 times longer desired scanner could operat ed directly external large capacity 32 NEW ANTENNA SUPPRT LOCATION DRILL 1/8 HOLE // FILE TO I/B SQUARE FOR ONBOTTOMOFN i7 SUPPORTN/ 32 SPEAKER & ANTENNA BASE MOUNTING HO LES #30 PLEXIGLASS COVER HOLES DRILL & TAP FOR #2 SCREW PLEXIGLASS COVER 1/4 LARGER THAN OPENING 11D EAKER L____1 CRYSTALS - S 15 . ii 32 1 2 Full-size drawing top section scanner caseshowing location new openings required described modifications Top/bottom sections interchanged full-replaceable-Orystai mods four-cell Ni-Cd pack case power cable could brought rear unit through grommet-protected hole mated directly plug internal batteries connect use 12-volt source contemplat ed socket provided its input could rewired accept four-cell external pack Merely disconnect insulate wires already socket connect red wire its center post point connection red wire ternal battery black wire should run outside contact socket connect black wire inter nal battery correct input polarity matching plug must also maintained Minor frequency changes Lets get Left Crystal bank shown crystal socket installed allow plug-in crystal changes easiest partial conversion Right Crystai bankwlth plug-in crystal itssocket Solution thetext installing seven side-by-side plug-in crystalswith identifying capsattached November 1984 77 Lower left rear bottom main printed circuit board showing location holes required mounting crystal socket assembly 470 II OUTTO SCANNER ANTENNA INPUT I5OO~ ANTENNA 47\ DPDT SWITCH Basic RF attenuator circuitand diagram showing can switched out double-pole double-throw switch what can update scanner operate new frequencies several options depending needs Fortunately circuitry will require changes 72-75 MHz fre quencies covered equal efficien -- GROUND cy Therefore changes made mostly mechanical should scare off first step obviously take unit apart top bottom halves come off after removing four sheet metal screws side rear cover comes off instance described later taking off top bottom enough now First individual needs change frequency able monitor new system small club needs cover couple new frequencies change simple just remove replace Remove old crystal replace new too have option can just solder new crystal place can install socket fast future replace ment field subject crystals crystal other name may sometimes rose other words crystals work correctly circuits something called overtones number times fundamental crystal fre quency multiplied arrive operating frequency case funda mental frequency crystal seems used overtone crystals spares box will work So safer order whatever need Airtronics dealer directly company stocks frequencies new old $750 Left Crystal socket board position over original crystal location within scanner installed small spacers 4-40 screws piastic washers nuts Right top updated scanner showing new plug-In crystal board plastic cover new location antenna mount speaker speaker grilicloth has added 78 Model Aviation Above Perforated electronic prototype board base new crystal socket board Use cutting drilling guide Note hole sizes Right Crystal socket board sockets taching wires place Solid wires will inserted soldered holes originally used seven basic frequency crystals Specify receiver crystal order prefer solder new decide old frequencies sacrificed locate its crystal within scanner referring originallyinstalled crystals lets think fre quencies covered 1 through 7 looking front frequency-indicating LEDs Thus 72080 No 1 forth 75640 No 7 Looking photo printed circuit board lower right rear note lands crystals soldered Note nine identical sections though seven have components installed position scanner crystal positions coincide frequency LEDs No 1 left etc However looking top scanner front inver sion No 7 now first left etc Anyway remove unwanted crystals Use small iron find rated 12 watts enough Dont use 4 5/8 4 5/8 9/16 CRYSTAL PIN HOLES 7/ 3 3/8 611 *-I 1/16 X5 Layout crystal holder board used crystal caddy sandwich box Make holder 3/16-In plastic Pin spacing 192 use dividers mark holes accurately soldering gun save working radiators gutters Use solder removal wicks such Radio Shack No 64-2090 remove solder crystal pins lands Continued page 172 Left Crystal holder insert described made 3/16-in plastic labeis cut Alrtronics frequency card tached Sonic-Tronics Crazy Tape Right Anyone crystal sandwich crystal holder shown mounted inside plastic snap-cover sandwich box system crystal location identification accomplished easily Au photographs author November 1984 79 Left Rear cover turned 180 allow lower relocation 1 2V put plug bottom pansi Above newiy-lnstaiied RF attenu ator switch per text Above scanner loses sensitivity first test batteries check tuning Arrows indicate 1 RF enveiope 2 detected output pickup pointson board NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling Item 13 shown Sheet 1 plans Install hook fuselage shown Detail Install #6 x %-in screw A6-in hole drilled earlierscrew until protrudes 1A-in screw will used stop hook down position Wrap solder length A2-in music wire elevator pushrod bend hold tail hook up position Trim end wire hook will drop elevator full-down position see Detail B Item 20 Loop rubberband around hook engage screw extending round doubler Engage hook elevator pushrod recheck will drop full-down elevator Finishing Remove engine hook tail gear Cover wings silkspan equivalent material Paint upper part fuselage blue-gray lower part light gray plan shows approximate line separates colors upper part wing blue-gray bottom light gray canopy windows white Apply white fuselage lettering star insignias latter red white blue colors Apply 1 oz stick-on lead weight underside right wing tip stall engine fuel tank hook tail gear Check model balances within / center gravity CG loca tion shown Sheet 1 plans Apply nose tail weight needed achieve desired balance point Flying little Dauntless very stable flight lifts off deck very quickly settles down smooth high-speed flight Speeds 60 70 mph easily attained have flown Dauntless 70 mph take first place club contests Slowing down Dauntless lowspeed flight quite uneventful little ship requires small amount upelevator hold reduced speed practice can really get nose up correct throttle control being applied Landing best part Just pick Z495 $3295 $3995 Dealers inquiries invited spot chop throttle let settle Its easy make three-point landings model hope enjoy flying 15 Dauntless much have Happy landings ScannerlMarez Continued page 79 quickly possible crystals damaged soldering de-soldering like electronic components dont really like long sustained applica tions high temperatures Fortunately pins installed crystals cut off can re-use sockets after cleaning solder off Assuming interested couple new frequencies may opt solder new crystals point However interest cludes sockets should first talk about crystals little bit First former two types sockets available has same pin diameter spacing crystals will drop right hole printed circuit board Another has wide flat pins wider spacing will Both available Kraft Systems boardmounted type need point Part No 120-074 $300 other type use will described later Part No 120-141K $100 Small crystal sockets such something rarity dont bother looking Radio Shack small electronics supply houses Back crystals again recom mendation get Airtronics insist different source need HC-25/U type accept HC 18/U same size has long wires instead pins unless definitely intend solder Airtronics crystals come nice neat molded plastic cap identified colors channel numbers tremendous help especially have decided plug-in field changes ever cap too wide allow seven plug-in crystals space provided PC board can install sockets ProTt MO MOLDED STRONG -METAL FRAMEGREAT GIFT 5 FOAM FILLED Transmitter ection Case X PRICE $35 Include Shipping & Kondling US CA re odd 6% Send check yr 0 5 ERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 other position four plug-ins enough satisfy requirements can trim lip sides th molded cap narrows enough allow seven side-by-side crystals However previous men tion plug-in crystals will still need remove top cover whenever fre quency change required too slow involved constant changes required scanner ing used active contest situa tion will get worse new frequencies phased have developed ultimate update will now described Full-house update Basically will stall support-mounted crystal socket board high enough permit easy crystal identification changes clear plastic window will provided checking installed crystals new board being larger space initially used original crystal circuitry will require relocation speaker antenna mount Dont put off scary-sounding things recommended changes still mainly mechanical no volved electronics changes being required Start taking off top bottom covers rear panel Unsolder wires speaker antenna connec tor remove 12-volt power input jack panel Using small iron solder wick remove seven crystals board clean solder completely off pins best done applying bit paste solder flux heat wiping off melt ed solder rag careful leave solder bridges board dur ing desoldening operation make crystal socket board youll need piece 1-in spacing elec tronic prototype perforated board prefer ably epoxy-based type cheaper phenolic board acceptable though does drill cut cleanly epoxy strong Cut size 14 x 32 holes shown photo Referring again photo note locations new holes drill indicated Note 14 crystal 172 Model Aviation xket holes drilled existing ole locations other two mounting oles located between already-existing oles Two holes have drilled scan er PC board adjacent initially stalled crystals Note diagram e exact location holes hole earest corner board will cut irough unused board land dont oncerned about innermost hole rill cut land large diode nd red wire connected little irgery required Remove iode completely off board tall opposite end completely down ne board land its bent ver lead soldered Resolder clip ntis wire red wire now soldered ne top diode lead thus making same riginal connections provides ecessary room spacer ne crystal socket board rests board supported 46-in spacers 4-40 rews through holes sockets required flat pin pe Kraft No 120-141K should istalled board time using ery small drop cyanoacrylate t wick up sockets pins nien folded inward secure erf board 1-in length unin ilated solid wire No 22 24 oldered socket pin per hoto Now mate two assemblies Hold socket board above scanner board tarting inside insert first wo wires connected socket nenter pair crystal pin holes Work ucceeding pair wires respec ive holes pair tweezers good ighting necessary requirements Push board place install Y6-in pacers 4-40 bolts tighten lace make sure wires uckle bend other nylon r fiber washer should used under -40 nut land side scanner oard provide insulation scan er found couple tall apacitors located just inboard rystals installed directly board high enough inter rere new socket board run nto locate lands apacitors installed heat solder onnections push down board Lightly pull wire comes through board pair should equal length Solder clip off ex ess wire clean off remaining solder flux alcohol stiff brush cheap -in brush bristles cut off V2-in length ideal such purposes point good idea recon nect speaker battery plug crystals check scanner normal operation Note again looking scanner normal operators view indicating LEDs read left right order ascending frequen cy crystal location however right left other words crystal 72080 first LED left last crystal line right Since frequencies indicated front panel will no longer apply cases best re-label 1-7 merely help maintain relationship between installed crystals LEDs still modification consider case far wish go well help finish off will now remount antenna anten na support speaker make ac cess hole crystals First remove hardware top cover Once clean consider installing stick-on bolt-on rubber foot corner since now holding bottom scanner Yep switching top bottom holes original top lend themselves new open ings required Refer sketch dimensions locations new openings go Unfortunately covers aluminum steel however particularly hard can cut fine-tooth blade Dremel saw finished off files group has active Ham electronics hobbyist ask him has Greenlee chassis punches screw-operated devices made just purpose cut accurate clean distor tion-free holes used 1-in round punch speaker hole. rectangle made 1-in square punch used both ends middle sawed filed out After sheet metal work done grille cloth must installed over speaker hole Any light weight black material will can secured place adhesive Remount speaker antenna antenna support latter will require small square hole will see once has removed its original loca tion can reattached silicone rubber clear plastic top made A-in Plexiglas absolute re quirement does add touch class held place two No 2 machine screws tapped top contest use top left screw removed cover pivoted out way Reconnect antenna speaker wires button up go look nearest contest Signal Attenuator promised mod have al ready used Airtronics Scanner close proximity flight line know sometimes subject swamping strong signals certain frequencies will cause er ratic operation scanner should ac tually used farther away flight line practical way contests have run problem also recognized Mr Bill Hersh berger able persons provided expertise AMA dur ing recent new frequency negotiations Bill has developed signal attenuator have incorporated switch in/out feature updated scanner will need three resistors switch latter installed rear cover scanner Notice weve turned cover around 180 degrees 12-volt input socket has moved way bottom attenuator switch located over switch used C&K DPDT Model No 1201 small high-quality switch ideal RC applications However cant obtain locally small DPDT slide toggle switch fits Continued page 176 November1984 173 ScannerlMare Continued page 173 available space will Notice sketch schematic wiring dia grams attenuator Install switch out circuit High knob down Low About 30dB attenuation obtained use allow monitor strong nearby signals switch attenuator collapse antenna Remember though makes scanner less sensitive weak out-of-the-area inter ference Periodically activity permits attenuator should switched out antenna extended check possible incoming interference Crystal Holder Now youve got -SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE N ERNA ONA CATALOG48500 MC KENZIE HWY $300VIDA OREGON 97488 SILICONE tr ID 062 092 125 U S POST 10 foot coils TUBING S/coil 235 265 3 2554 CO L [ LARRY DODGE ERG INC 10210 MANNINGSTILLWATER MN 5508 NOSTALGIC FLYING NEW VERSION OF ORIGINAL CHRISTMAS CARD TRU-FLITE MODEL FROM THE PAST reje When,. Pesos to, 40s Solids isto en eSeol,telv SeeottI tflee Model ttStOoOeI I5eo5 ~ oo~s Note usa GeetssteetetoIy dose 0e 24 Istshensekpe3 p2495 Box S2mn Rosaville MI 48066 TORK-STARTER $2995 Charger 11 tV 220V 1 2V Fast Charger $2095 Without Charger CHARGERS $1295 Charger Only Ill OV 220V 1 2V Past Charger 301 464-2260 nice new modern plug-in crystal attenu ated scanner youll getting complete set crystals go youll need way store transport identify May suggest Deluxe RC Crystal Caddy after brown bag has no class caddy started life off ubiqui tous plastic sandwich box snap-on cover nearest food store come sizes shapes choice Superseal #3427 nationally avail able however similar will onehas inside dimension 5%-in square insert based use another size merely adjust outside dimensions insert ac tual crystal holder youll need piece plastic least Y16-in thick Measure mark off material per diagram drill 36 holes required #56 bit exact crystal pin spacing 192 rather difficult lay out fractional scale accurate set pair dividers right dimen sion using crystal pins guide mark hole spacing labels crystal holder cut Airtronics Frequency Card can have asking order crystals Apply some thin double-sided tape rear card before cut out individual labels find Sonic-Tronics Crazy Tape excellent other modeling chores Keep protective covering until youve trimmed labels size trimmed drilled labeled crystal holder secured case sticky tape piece foam rubber attached cover keep crystals place during drive field Neat huh Cars boats Basically weve treated update aircraft frequencies since primary RC interest However scanner works equally well 75 MHz car boat frequencies can convert channels either methods described Air tronics does have Crystals hand same price correct labels found other side card Tuning future time feel scanner losing sensitivity first thing after verifying batteries good shape check tuning photos y5TE Easy use part no mix paint system No mixing No waiting Fast drying extremely fuel proof Formulated just modeler covers surfaces paints resins Send free instruction brochure BUY IT YOULL LIKE IT SIG MFG COMontezuma IA 50171 shows proper spots PC board whici can pick up modulated waveform thl detected output Tuning should done tin middle band using antenna-down trans mitter some distance away signal source Adjust RF IF transformers maxi mum signal scope Physically lo cated line starting vicinity antennl input towards center unit Crystals once again Airtronics has graciousl agreed furnish sets new frequency crys tals special prices duly registered plane boat car clubs Included also packagt will some molded crystal caps bt used originally-installed crystals whict have Write Airtronics curren information meantime isnt nice know thal something own thought ha obsoleted technology can updated tc fly again Parts update As writing two types ol crystal sockets erroneously listed HC-1S crystals must HC-25 made former cataloged Semi conductor Surplus 2822 North 32nd St Unit 1 Phoenix AZ 85008 priced 504 actually two $100 have sia minimum also always list lot useful items getting order level difficult Ask check catalog Scale WClWlschers Continued page 91 90 four-stroke Air made its exit through dummy exhaust stacks method could successful Englands cool weather high temperatures existed during three flying days Le Bourget Mick cooling problems noticeable loss engine rpm engine spaced back 15-in shaft extension model weight 129 lb meant engines full output needed maintain flying speed Mick con centrated using enough power result speed scalelike Features model handmade aluminum wheels tires molded Devcon RTV compound paper covering over balsa structure Hobbypoxy finish over dope-and-talc filler Brian Taylors Bristol Beaufighter second-highest static score along flight reasonably high quality As can expected Brian model exceptional Surprisingly 176 Model Aviation r Rk MFG OF NI STARTER $2995 Charger PLEASE SPECIFY WHICH CHARGER WHEN ORDERING TORK-STARTER revolutionary concept power 15V glow plugs model cars boats air planes using glow fuel engines TORK-STARTERITMI has steel wrench strong enough reduce compression easier starting ft supplies power vhII dolag comes new CIlO charger has LEO indicate unit charging also has removable T handle can used Torque amplifier Over 50 consecutive starts full charge rechargeable hundreds times Clips Onto plug positive connection Send ad along pre-paymens receive free shiooino handlino 12721 HASKELL LANE BOWIE MARYLAND 20716 L STICK&TISSUEMODELSFOAM SCALE ARE GREATMODELS new sheet foam bailds easier-Peanuts difference youll enloyat& Up lowest cost Several scale de signs available antique des sic warbirds 6 homebuilts Send $1O0forlatestplanslistfoam-samples discount coupon etcflex 652AM GETAFREECO-2MOTORSt CreSt Falls SW 54024
Edition: Model Aviation - 1984/11
Page Numbers: 76, 77, 78, 79, 172, 173, 176
Updating Old Airtronics Eloy Marez FREQUENCY SCANNER IpIIIII Dont despair have Airtronics Scanner original 72-75 MHz frequencies mods described article can adapt new channels came use last year THIS UNIT has become common sight contest frequency control tables rightfully provides muchneeded service price well within budget small clubs some individuals However recent assign ment first batch newlyreleased frequencies has partly entirely obsoleted older fine piece equipment number simple changes can made permit scanner continue work new future frequencies fact covers seven frequencies time now have 18 available much limiting factor hard conceive situations necessary fly planes given time have pleasure meeting Airtronics RC Frequency Scanner allow introduce scanner small 45 x 45 x 175-in self-contained frequency moni tor covers seven initially-assigned 72-75 MHz frequencies automatically scans band providing both visual aural indication signal being pres ent frequencies visual indicator red LED stays lit oc cupied frequency scanning con tinues unit can also placed manual control non-scan monitoring selected frequency volume control provided ample volume available nearby monitoring meter indicates relative signal strength 32-in collapsible whip antenna folds over lays across top cabinet Left The original Airtronics RC Frequency Scannerslightly outdated obsolete article tells may simply modi fled work new channels Top Right necessary crystals available Airtronics Shown crystals molded plastic caps marked channel identification Above Right Crystal sockets smali crys tals easiiy obtained Source both types shown required herein described updates inciuded text Left The crystal bank originally seen within scanner top rear view rear scanner Donom 720W MHZ crystal first left 75640 MHz crystal last right Right Bottom view printed circuit board showing crystal connections Note seven identical sections Arrows indicate lands crystals soldered 76 Model Aviation storage transportation Airtronics Scanner can operated either internal four-6ell Ni-Cd alkaline AA battery provided external 12volt supply latter cable furnished equipped cigarette lighter plug end coaxial power plug other mates matching receptacle rear panel Extensive volt age regulation usedfirst reduce 12 volts used further power crystal oscillat6rs some other internal circuit- ry latter will always receive exactly required voltage regardless supply low batteries requirement maximum frequency stability au dio amplifier works off unregulated voltage its operation will affected lower voltage available Ni-Cds 48 com pared alkalines 60 However relatively low er voltage resulting can compensated merely advancing vol ume control wee bit length operating time per set cells diffi cult calculate exactly scanner draws 50 milliamps during periods no-signal rising about 130 whei signal heard further af fected setting volume control Theoretically set properly charged Ni-Cds good condition could last long 10 hours low volume setting though would estimate five six hours realistic figure Alkalines can expected last 1 2 times longer desired scanner could operat ed directly external large capacity 32 NEW ANTENNA SUPPRT LOCATION DRILL 1/8 HOLE // FILE TO I/B SQUARE FOR ONBOTTOMOFN i7 SUPPORTN/ 32 SPEAKER & ANTENNA BASE MOUNTING HO LES #30 PLEXIGLASS COVER HOLES DRILL & TAP FOR #2 SCREW PLEXIGLASS COVER 1/4 LARGER THAN OPENING 11D EAKER L____1 CRYSTALS - S 15 . ii 32 1 2 Full-size drawing top section scanner caseshowing location new openings required described modifications Top/bottom sections interchanged full-replaceable-Orystai mods four-cell Ni-Cd pack case power cable could brought rear unit through grommet-protected hole mated directly plug internal batteries connect use 12-volt source contemplat ed socket provided its input could rewired accept four-cell external pack Merely disconnect insulate wires already socket connect red wire its center post point connection red wire ternal battery black wire should run outside contact socket connect black wire inter nal battery correct input polarity matching plug must also maintained Minor frequency changes Lets get Left Crystal bank shown crystal socket installed allow plug-in crystal changes easiest partial conversion Right Crystai bankwlth plug-in crystal itssocket Solution thetext installing seven side-by-side plug-in crystalswith identifying capsattached November 1984 77 Lower left rear bottom main printed circuit board showing location holes required mounting crystal socket assembly 470 II OUTTO SCANNER ANTENNA INPUT I5OO~ ANTENNA 47\ DPDT SWITCH Basic RF attenuator circuitand diagram showing can switched out double-pole double-throw switch what can update scanner operate new frequencies several options depending needs Fortunately circuitry will require changes 72-75 MHz fre quencies covered equal efficien -- GROUND cy Therefore changes made mostly mechanical should scare off first step obviously take unit apart top bottom halves come off after removing four sheet metal screws side rear cover comes off instance described later taking off top bottom enough now First individual needs change frequency able monitor new system small club needs cover couple new frequencies change simple just remove replace Remove old crystal replace new too have option can just solder new crystal place can install socket fast future replace ment field subject crystals crystal other name may sometimes rose other words crystals work correctly circuits something called overtones number times fundamental crystal fre quency multiplied arrive operating frequency case funda mental frequency crystal seems used overtone crystals spares box will work So safer order whatever need Airtronics dealer directly company stocks frequencies new old $750 Left Crystal socket board position over original crystal location within scanner installed small spacers 4-40 screws piastic washers nuts Right top updated scanner showing new plug-In crystal board plastic cover new location antenna mount speaker speaker grilicloth has added 78 Model Aviation Above Perforated electronic prototype board base new crystal socket board Use cutting drilling guide Note hole sizes Right Crystal socket board sockets taching wires place Solid wires will inserted soldered holes originally used seven basic frequency crystals Specify receiver crystal order prefer solder new decide old frequencies sacrificed locate its crystal within scanner referring originallyinstalled crystals lets think fre quencies covered 1 through 7 looking front frequency-indicating LEDs Thus 72080 No 1 forth 75640 No 7 Looking photo printed circuit board lower right rear note lands crystals soldered Note nine identical sections though seven have components installed position scanner crystal positions coincide frequency LEDs No 1 left etc However looking top scanner front inver sion No 7 now first left etc Anyway remove unwanted crystals Use small iron find rated 12 watts enough Dont use 4 5/8 4 5/8 9/16 CRYSTAL PIN HOLES 7/ 3 3/8 611 *-I 1/16 X5 Layout crystal holder board used crystal caddy sandwich box Make holder 3/16-In plastic Pin spacing 192 use dividers mark holes accurately soldering gun save working radiators gutters Use solder removal wicks such Radio Shack No 64-2090 remove solder crystal pins lands Continued page 172 Left Crystal holder insert described made 3/16-in plastic labeis cut Alrtronics frequency card tached Sonic-Tronics Crazy Tape Right Anyone crystal sandwich crystal holder shown mounted inside plastic snap-cover sandwich box system crystal location identification accomplished easily Au photographs author November 1984 79 Left Rear cover turned 180 allow lower relocation 1 2V put plug bottom pansi Above newiy-lnstaiied RF attenu ator switch per text Above scanner loses sensitivity first test batteries check tuning Arrows indicate 1 RF enveiope 2 detected output pickup pointson board NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling Item 13 shown Sheet 1 plans Install hook fuselage shown Detail Install #6 x %-in screw A6-in hole drilled earlierscrew until protrudes 1A-in screw will used stop hook down position Wrap solder length A2-in music wire elevator pushrod bend hold tail hook up position Trim end wire hook will drop elevator full-down position see Detail B Item 20 Loop rubberband around hook engage screw extending round doubler Engage hook elevator pushrod recheck will drop full-down elevator Finishing Remove engine hook tail gear Cover wings silkspan equivalent material Paint upper part fuselage blue-gray lower part light gray plan shows approximate line separates colors upper part wing blue-gray bottom light gray canopy windows white Apply white fuselage lettering star insignias latter red white blue colors Apply 1 oz stick-on lead weight underside right wing tip stall engine fuel tank hook tail gear Check model balances within / center gravity CG loca tion shown Sheet 1 plans Apply nose tail weight needed achieve desired balance point Flying little Dauntless very stable flight lifts off deck very quickly settles down smooth high-speed flight Speeds 60 70 mph easily attained have flown Dauntless 70 mph take first place club contests Slowing down Dauntless lowspeed flight quite uneventful little ship requires small amount upelevator hold reduced speed practice can really get nose up correct throttle control being applied Landing best part Just pick Z495 $3295 $3995 Dealers inquiries invited spot chop throttle let settle Its easy make three-point landings model hope enjoy flying 15 Dauntless much have Happy landings ScannerlMarez Continued page 79 quickly possible crystals damaged soldering de-soldering like electronic components dont really like long sustained applica tions high temperatures Fortunately pins installed crystals cut off can re-use sockets after cleaning solder off Assuming interested couple new frequencies may opt solder new crystals point However interest cludes sockets should first talk about crystals little bit First former two types sockets available has same pin diameter spacing crystals will drop right hole printed circuit board Another has wide flat pins wider spacing will Both available Kraft Systems boardmounted type need point Part No 120-074 $300 other type use will described later Part No 120-141K $100 Small crystal sockets such something rarity dont bother looking Radio Shack small electronics supply houses Back crystals again recom mendation get Airtronics insist different source need HC-25/U type accept HC 18/U same size has long wires instead pins unless definitely intend solder Airtronics crystals come nice neat molded plastic cap identified colors channel numbers tremendous help especially have decided plug-in field changes ever cap too wide allow seven plug-in crystals space provided PC board can install sockets ProTt MO MOLDED STRONG -METAL FRAMEGREAT GIFT 5 FOAM FILLED Transmitter ection Case X PRICE $35 Include Shipping & Kondling US CA re odd 6% Send check yr 0 5 ERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 other position four plug-ins enough satisfy requirements can trim lip sides th molded cap narrows enough allow seven side-by-side crystals However previous men tion plug-in crystals will still need remove top cover whenever fre quency change required too slow involved constant changes required scanner ing used active contest situa tion will get worse new frequencies phased have developed ultimate update will now described Full-house update Basically will stall support-mounted crystal socket board high enough permit easy crystal identification changes clear plastic window will provided checking installed crystals new board being larger space initially used original crystal circuitry will require relocation speaker antenna mount Dont put off scary-sounding things recommended changes still mainly mechanical no volved electronics changes being required Start taking off top bottom covers rear panel Unsolder wires speaker antenna connec tor remove 12-volt power input jack panel Using small iron solder wick remove seven crystals board clean solder completely off pins best done applying bit paste solder flux heat wiping off melt ed solder rag careful leave solder bridges board dur ing desoldening operation make crystal socket board youll need piece 1-in spacing elec tronic prototype perforated board prefer ably epoxy-based type cheaper phenolic board acceptable though does drill cut cleanly epoxy strong Cut size 14 x 32 holes shown photo Referring again photo note locations new holes drill indicated Note 14 crystal 172 Model Aviation xket holes drilled existing ole locations other two mounting oles located between already-existing oles Two holes have drilled scan er PC board adjacent initially stalled crystals Note diagram e exact location holes hole earest corner board will cut irough unused board land dont oncerned about innermost hole rill cut land large diode nd red wire connected little irgery required Remove iode completely off board tall opposite end completely down ne board land its bent ver lead soldered Resolder clip ntis wire red wire now soldered ne top diode lead thus making same riginal connections provides ecessary room spacer ne crystal socket board rests board supported 46-in spacers 4-40 rews through holes sockets required flat pin pe Kraft No 120-141K should istalled board time using ery small drop cyanoacrylate t wick up sockets pins nien folded inward secure erf board 1-in length unin ilated solid wire No 22 24 oldered socket pin per hoto Now mate two assemblies Hold socket board above scanner board tarting inside insert first wo wires connected socket nenter pair crystal pin holes Work ucceeding pair wires respec ive holes pair tweezers good ighting necessary requirements Push board place install Y6-in pacers 4-40 bolts tighten lace make sure wires uckle bend other nylon r fiber washer should used under -40 nut land side scanner oard provide insulation scan er found couple tall apacitors located just inboard rystals installed directly board high enough inter rere new socket board run nto locate lands apacitors installed heat solder onnections push down board Lightly pull wire comes through board pair should equal length Solder clip off ex ess wire clean off remaining solder flux alcohol stiff brush cheap -in brush bristles cut off V2-in length ideal such purposes point good idea recon nect speaker battery plug crystals check scanner normal operation Note again looking scanner normal operators view indicating LEDs read left right order ascending frequen cy crystal location however right left other words crystal 72080 first LED left last crystal line right Since frequencies indicated front panel will no longer apply cases best re-label 1-7 merely help maintain relationship between installed crystals LEDs still modification consider case far wish go well help finish off will now remount antenna anten na support speaker make ac cess hole crystals First remove hardware top cover Once clean consider installing stick-on bolt-on rubber foot corner since now holding bottom scanner Yep switching top bottom holes original top lend themselves new open ings required Refer sketch dimensions locations new openings go Unfortunately covers aluminum steel however particularly hard can cut fine-tooth blade Dremel saw finished off files group has active Ham electronics hobbyist ask him has Greenlee chassis punches screw-operated devices made just purpose cut accurate clean distor tion-free holes used 1-in round punch speaker hole. rectangle made 1-in square punch used both ends middle sawed filed out After sheet metal work done grille cloth must installed over speaker hole Any light weight black material will can secured place adhesive Remount speaker antenna antenna support latter will require small square hole will see once has removed its original loca tion can reattached silicone rubber clear plastic top made A-in Plexiglas absolute re quirement does add touch class held place two No 2 machine screws tapped top contest use top left screw removed cover pivoted out way Reconnect antenna speaker wires button up go look nearest contest Signal Attenuator promised mod have al ready used Airtronics Scanner close proximity flight line know sometimes subject swamping strong signals certain frequencies will cause er ratic operation scanner should ac tually used farther away flight line practical way contests have run problem also recognized Mr Bill Hersh berger able persons provided expertise AMA dur ing recent new frequency negotiations Bill has developed signal attenuator have incorporated switch in/out feature updated scanner will need three resistors switch latter installed rear cover scanner Notice weve turned cover around 180 degrees 12-volt input socket has moved way bottom attenuator switch located over switch used C&K DPDT Model No 1201 small high-quality switch ideal RC applications However cant obtain locally small DPDT slide toggle switch fits Continued page 176 November1984 173 ScannerlMare Continued page 173 available space will Notice sketch schematic wiring dia grams attenuator Install switch out circuit High knob down Low About 30dB attenuation obtained use allow monitor strong nearby signals switch attenuator collapse antenna Remember though makes scanner less sensitive weak out-of-the-area inter ference Periodically activity permits attenuator should switched out antenna extended check possible incoming interference Crystal Holder Now youve got -SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE N ERNA ONA CATALOG48500 MC KENZIE HWY $300VIDA OREGON 97488 SILICONE tr ID 062 092 125 U S POST 10 foot coils TUBING S/coil 235 265 3 2554 CO L [ LARRY DODGE ERG INC 10210 MANNINGSTILLWATER MN 5508 NOSTALGIC FLYING NEW VERSION OF ORIGINAL CHRISTMAS CARD TRU-FLITE MODEL FROM THE PAST reje When,. Pesos to, 40s Solids isto en eSeol,telv SeeottI tflee Model ttStOoOeI I5eo5 ~ oo~s Note usa GeetssteetetoIy dose 0e 24 Istshensekpe3 p2495 Box S2mn Rosaville MI 48066 TORK-STARTER $2995 Charger 11 tV 220V 1 2V Fast Charger $2095 Without Charger CHARGERS $1295 Charger Only Ill OV 220V 1 2V Past Charger 301 464-2260 nice new modern plug-in crystal attenu ated scanner youll getting complete set crystals go youll need way store transport identify May suggest Deluxe RC Crystal Caddy after brown bag has no class caddy started life off ubiqui tous plastic sandwich box snap-on cover nearest food store come sizes shapes choice Superseal #3427 nationally avail able however similar will onehas inside dimension 5%-in square insert based use another size merely adjust outside dimensions insert ac tual crystal holder youll need piece plastic least Y16-in thick Measure mark off material per diagram drill 36 holes required #56 bit exact crystal pin spacing 192 rather difficult lay out fractional scale accurate set pair dividers right dimen sion using crystal pins guide mark hole spacing labels crystal holder cut Airtronics Frequency Card can have asking order crystals Apply some thin double-sided tape rear card before cut out individual labels find Sonic-Tronics Crazy Tape excellent other modeling chores Keep protective covering until youve trimmed labels size trimmed drilled labeled crystal holder secured case sticky tape piece foam rubber attached cover keep crystals place during drive field Neat huh Cars boats Basically weve treated update aircraft frequencies since primary RC interest However scanner works equally well 75 MHz car boat frequencies can convert channels either methods described Air tronics does have Crystals hand same price correct labels found other side card Tuning future time feel scanner losing sensitivity first thing after verifying batteries good shape check tuning photos y5TE Easy use part no mix paint system No mixing No waiting Fast drying extremely fuel proof Formulated just modeler covers surfaces paints resins Send free instruction brochure BUY IT YOULL LIKE IT SIG MFG COMontezuma IA 50171 shows proper spots PC board whici can pick up modulated waveform thl detected output Tuning should done tin middle band using antenna-down trans mitter some distance away signal source Adjust RF IF transformers maxi mum signal scope Physically lo cated line starting vicinity antennl input towards center unit Crystals once again Airtronics has graciousl agreed furnish sets new frequency crys tals special prices duly registered plane boat car clubs Included also packagt will some molded crystal caps bt used originally-installed crystals whict have Write Airtronics curren information meantime isnt nice know thal something own thought ha obsoleted technology can updated tc fly again Parts update As writing two types ol crystal sockets erroneously listed HC-1S crystals must HC-25 made former cataloged Semi conductor Surplus 2822 North 32nd St Unit 1 Phoenix AZ 85008 priced 504 actually two $100 have sia minimum also always list lot useful items getting order level difficult Ask check catalog Scale WClWlschers Continued page 91 90 four-stroke Air made its exit through dummy exhaust stacks method could successful Englands cool weather high temperatures existed during three flying days Le Bourget Mick cooling problems noticeable loss engine rpm engine spaced back 15-in shaft extension model weight 129 lb meant engines full output needed maintain flying speed Mick con centrated using enough power result speed scalelike Features model handmade aluminum wheels tires molded Devcon RTV compound paper covering over balsa structure Hobbypoxy finish over dope-and-talc filler Brian Taylors Bristol Beaufighter second-highest static score along flight reasonably high quality As can expected Brian model exceptional Surprisingly 176 Model Aviation r Rk MFG OF NI STARTER $2995 Charger PLEASE SPECIFY WHICH CHARGER WHEN ORDERING TORK-STARTER revolutionary concept power 15V glow plugs model cars boats air planes using glow fuel engines TORK-STARTERITMI has steel wrench strong enough reduce compression easier starting ft supplies power vhII dolag comes new CIlO charger has LEO indicate unit charging also has removable T handle can used Torque amplifier Over 50 consecutive starts full charge rechargeable hundreds times Clips Onto plug positive connection Send ad along pre-paymens receive free shiooino handlino 12721 HASKELL LANE BOWIE MARYLAND 20716 L STICK&TISSUEMODELSFOAM SCALE ARE GREATMODELS new sheet foam bailds easier-Peanuts difference youll enloyat& Up lowest cost Several scale de signs available antique des sic warbirds 6 homebuilts Send $1O0forlatestplanslistfoam-samples discount coupon etcflex 652AM GETAFREECO-2MOTORSt CreSt Falls SW 54024
Edition: Model Aviation - 1984/11
Page Numbers: 76, 77, 78, 79, 172, 173, 176
Updating Old Airtronics Eloy Marez FREQUENCY SCANNER IpIIIII Dont despair have Airtronics Scanner original 72-75 MHz frequencies mods described article can adapt new channels came use last year THIS UNIT has become common sight contest frequency control tables rightfully provides muchneeded service price well within budget small clubs some individuals However recent assign ment first batch newlyreleased frequencies has partly entirely obsoleted older fine piece equipment number simple changes can made permit scanner continue work new future frequencies fact covers seven frequencies time now have 18 available much limiting factor hard conceive situations necessary fly planes given time have pleasure meeting Airtronics RC Frequency Scanner allow introduce scanner small 45 x 45 x 175-in self-contained frequency moni tor covers seven initially-assigned 72-75 MHz frequencies automatically scans band providing both visual aural indication signal being pres ent frequencies visual indicator red LED stays lit oc cupied frequency scanning con tinues unit can also placed manual control non-scan monitoring selected frequency volume control provided ample volume available nearby monitoring meter indicates relative signal strength 32-in collapsible whip antenna folds over lays across top cabinet Left The original Airtronics RC Frequency Scannerslightly outdated obsolete article tells may simply modi fled work new channels Top Right necessary crystals available Airtronics Shown crystals molded plastic caps marked channel identification Above Right Crystal sockets smali crys tals easiiy obtained Source both types shown required herein described updates inciuded text Left The crystal bank originally seen within scanner top rear view rear scanner Donom 720W MHZ crystal first left 75640 MHz crystal last right Right Bottom view printed circuit board showing crystal connections Note seven identical sections Arrows indicate lands crystals soldered 76 Model Aviation storage transportation Airtronics Scanner can operated either internal four-6ell Ni-Cd alkaline AA battery provided external 12volt supply latter cable furnished equipped cigarette lighter plug end coaxial power plug other mates matching receptacle rear panel Extensive volt age regulation usedfirst reduce 12 volts used further power crystal oscillat6rs some other internal circuit- ry latter will always receive exactly required voltage regardless supply low batteries requirement maximum frequency stability au dio amplifier works off unregulated voltage its operation will affected lower voltage available Ni-Cds 48 com pared alkalines 60 However relatively low er voltage resulting can compensated merely advancing vol ume control wee bit length operating time per set cells diffi cult calculate exactly scanner draws 50 milliamps during periods no-signal rising about 130 whei signal heard further af fected setting volume control Theoretically set properly charged Ni-Cds good condition could last long 10 hours low volume setting though would estimate five six hours realistic figure Alkalines can expected last 1 2 times longer desired scanner could operat ed directly external large capacity 32 NEW ANTENNA SUPPRT LOCATION DRILL 1/8 HOLE // FILE TO I/B SQUARE FOR ONBOTTOMOFN i7 SUPPORTN/ 32 SPEAKER & ANTENNA BASE MOUNTING HO LES #30 PLEXIGLASS COVER HOLES DRILL & TAP FOR #2 SCREW PLEXIGLASS COVER 1/4 LARGER THAN OPENING 11D EAKER L____1 CRYSTALS - S 15 . ii 32 1 2 Full-size drawing top section scanner caseshowing location new openings required described modifications Top/bottom sections interchanged full-replaceable-Orystai mods four-cell Ni-Cd pack case power cable could brought rear unit through grommet-protected hole mated directly plug internal batteries connect use 12-volt source contemplat ed socket provided its input could rewired accept four-cell external pack Merely disconnect insulate wires already socket connect red wire its center post point connection red wire ternal battery black wire should run outside contact socket connect black wire inter nal battery correct input polarity matching plug must also maintained Minor frequency changes Lets get Left Crystal bank shown crystal socket installed allow plug-in crystal changes easiest partial conversion Right Crystai bankwlth plug-in crystal itssocket Solution thetext installing seven side-by-side plug-in crystalswith identifying capsattached November 1984 77 Lower left rear bottom main printed circuit board showing location holes required mounting crystal socket assembly 470 II OUTTO SCANNER ANTENNA INPUT I5OO~ ANTENNA 47\ DPDT SWITCH Basic RF attenuator circuitand diagram showing can switched out double-pole double-throw switch what can update scanner operate new frequencies several options depending needs Fortunately circuitry will require changes 72-75 MHz fre quencies covered equal efficien -- GROUND cy Therefore changes made mostly mechanical should scare off first step obviously take unit apart top bottom halves come off after removing four sheet metal screws side rear cover comes off instance described later taking off top bottom enough now First individual needs change frequency able monitor new system small club needs cover couple new frequencies change simple just remove replace Remove old crystal replace new too have option can just solder new crystal place can install socket fast future replace ment field subject crystals crystal other name may sometimes rose other words crystals work correctly circuits something called overtones number times fundamental crystal fre quency multiplied arrive operating frequency case funda mental frequency crystal seems used overtone crystals spares box will work So safer order whatever need Airtronics dealer directly company stocks frequencies new old $750 Left Crystal socket board position over original crystal location within scanner installed small spacers 4-40 screws piastic washers nuts Right top updated scanner showing new plug-In crystal board plastic cover new location antenna mount speaker speaker grilicloth has added 78 Model Aviation Above Perforated electronic prototype board base new crystal socket board Use cutting drilling guide Note hole sizes Right Crystal socket board sockets taching wires place Solid wires will inserted soldered holes originally used seven basic frequency crystals Specify receiver crystal order prefer solder new decide old frequencies sacrificed locate its crystal within scanner referring originallyinstalled crystals lets think fre quencies covered 1 through 7 looking front frequency-indicating LEDs Thus 72080 No 1 forth 75640 No 7 Looking photo printed circuit board lower right rear note lands crystals soldered Note nine identical sections though seven have components installed position scanner crystal positions coincide frequency LEDs No 1 left etc However looking top scanner front inver sion No 7 now first left etc Anyway remove unwanted crystals Use small iron find rated 12 watts enough Dont use 4 5/8 4 5/8 9/16 CRYSTAL PIN HOLES 7/ 3 3/8 611 *-I 1/16 X5 Layout crystal holder board used crystal caddy sandwich box Make holder 3/16-In plastic Pin spacing 192 use dividers mark holes accurately soldering gun save working radiators gutters Use solder removal wicks such Radio Shack No 64-2090 remove solder crystal pins lands Continued page 172 Left Crystal holder insert described made 3/16-in plastic labeis cut Alrtronics frequency card tached Sonic-Tronics Crazy Tape Right Anyone crystal sandwich crystal holder shown mounted inside plastic snap-cover sandwich box system crystal location identification accomplished easily Au photographs author November 1984 79 Left Rear cover turned 180 allow lower relocation 1 2V put plug bottom pansi Above newiy-lnstaiied RF attenu ator switch per text Above scanner loses sensitivity first test batteries check tuning Arrows indicate 1 RF enveiope 2 detected output pickup pointson board NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling Item 13 shown Sheet 1 plans Install hook fuselage shown Detail Install #6 x %-in screw A6-in hole drilled earlierscrew until protrudes 1A-in screw will used stop hook down position Wrap solder length A2-in music wire elevator pushrod bend hold tail hook up position Trim end wire hook will drop elevator full-down position see Detail B Item 20 Loop rubberband around hook engage screw extending round doubler Engage hook elevator pushrod recheck will drop full-down elevator Finishing Remove engine hook tail gear Cover wings silkspan equivalent material Paint upper part fuselage blue-gray lower part light gray plan shows approximate line separates colors upper part wing blue-gray bottom light gray canopy windows white Apply white fuselage lettering star insignias latter red white blue colors Apply 1 oz stick-on lead weight underside right wing tip stall engine fuel tank hook tail gear Check model balances within / center gravity CG loca tion shown Sheet 1 plans Apply nose tail weight needed achieve desired balance point Flying little Dauntless very stable flight lifts off deck very quickly settles down smooth high-speed flight Speeds 60 70 mph easily attained have flown Dauntless 70 mph take first place club contests Slowing down Dauntless lowspeed flight quite uneventful little ship requires small amount upelevator hold reduced speed practice can really get nose up correct throttle control being applied Landing best part Just pick Z495 $3295 $3995 Dealers inquiries invited spot chop throttle let settle Its easy make three-point landings model hope enjoy flying 15 Dauntless much have Happy landings ScannerlMarez Continued page 79 quickly possible crystals damaged soldering de-soldering like electronic components dont really like long sustained applica tions high temperatures Fortunately pins installed crystals cut off can re-use sockets after cleaning solder off Assuming interested couple new frequencies may opt solder new crystals point However interest cludes sockets should first talk about crystals little bit First former two types sockets available has same pin diameter spacing crystals will drop right hole printed circuit board Another has wide flat pins wider spacing will Both available Kraft Systems boardmounted type need point Part No 120-074 $300 other type use will described later Part No 120-141K $100 Small crystal sockets such something rarity dont bother looking Radio Shack small electronics supply houses Back crystals again recom mendation get Airtronics insist different source need HC-25/U type accept HC 18/U same size has long wires instead pins unless definitely intend solder Airtronics crystals come nice neat molded plastic cap identified colors channel numbers tremendous help especially have decided plug-in field changes ever cap too wide allow seven plug-in crystals space provided PC board can install sockets ProTt MO MOLDED STRONG -METAL FRAMEGREAT GIFT 5 FOAM FILLED Transmitter ection Case X PRICE $35 Include Shipping & Kondling US CA re odd 6% Send check yr 0 5 ERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 other position four plug-ins enough satisfy requirements can trim lip sides th molded cap narrows enough allow seven side-by-side crystals However previous men tion plug-in crystals will still need remove top cover whenever fre quency change required too slow involved constant changes required scanner ing used active contest situa tion will get worse new frequencies phased have developed ultimate update will now described Full-house update Basically will stall support-mounted crystal socket board high enough permit easy crystal identification changes clear plastic window will provided checking installed crystals new board being larger space initially used original crystal circuitry will require relocation speaker antenna mount Dont put off scary-sounding things recommended changes still mainly mechanical no volved electronics changes being required Start taking off top bottom covers rear panel Unsolder wires speaker antenna connec tor remove 12-volt power input jack panel Using small iron solder wick remove seven crystals board clean solder completely off pins best done applying bit paste solder flux heat wiping off melt ed solder rag careful leave solder bridges board dur ing desoldening operation make crystal socket board youll need piece 1-in spacing elec tronic prototype perforated board prefer ably epoxy-based type cheaper phenolic board acceptable though does drill cut cleanly epoxy strong Cut size 14 x 32 holes shown photo Referring again photo note locations new holes drill indicated Note 14 crystal 172 Model Aviation xket holes drilled existing ole locations other two mounting oles located between already-existing oles Two holes have drilled scan er PC board adjacent initially stalled crystals Note diagram e exact location holes hole earest corner board will cut irough unused board land dont oncerned about innermost hole rill cut land large diode nd red wire connected little irgery required Remove iode completely off board tall opposite end completely down ne board land its bent ver lead soldered Resolder clip ntis wire red wire now soldered ne top diode lead thus making same riginal connections provides ecessary room spacer ne crystal socket board rests board supported 46-in spacers 4-40 rews through holes sockets required flat pin pe Kraft No 120-141K should istalled board time using ery small drop cyanoacrylate t wick up sockets pins nien folded inward secure erf board 1-in length unin ilated solid wire No 22 24 oldered socket pin per hoto Now mate two assemblies Hold socket board above scanner board tarting inside insert first wo wires connected socket nenter pair crystal pin holes Work ucceeding pair wires respec ive holes pair tweezers good ighting necessary requirements Push board place install Y6-in pacers 4-40 bolts tighten lace make sure wires uckle bend other nylon r fiber washer should used under -40 nut land side scanner oard provide insulation scan er found couple tall apacitors located just inboard rystals installed directly board high enough inter rere new socket board run nto locate lands apacitors installed heat solder onnections push down board Lightly pull wire comes through board pair should equal length Solder clip off ex ess wire clean off remaining solder flux alcohol stiff brush cheap -in brush bristles cut off V2-in length ideal such purposes point good idea recon nect speaker battery plug crystals check scanner normal operation Note again looking scanner normal operators view indicating LEDs read left right order ascending frequen cy crystal location however right left other words crystal 72080 first LED left last crystal line right Since frequencies indicated front panel will no longer apply cases best re-label 1-7 merely help maintain relationship between installed crystals LEDs still modification consider case far wish go well help finish off will now remount antenna anten na support speaker make ac cess hole crystals First remove hardware top cover Once clean consider installing stick-on bolt-on rubber foot corner since now holding bottom scanner Yep switching top bottom holes original top lend themselves new open ings required Refer sketch dimensions locations new openings go Unfortunately covers aluminum steel however particularly hard can cut fine-tooth blade Dremel saw finished off files group has active Ham electronics hobbyist ask him has Greenlee chassis punches screw-operated devices made just purpose cut accurate clean distor tion-free holes used 1-in round punch speaker hole. rectangle made 1-in square punch used both ends middle sawed filed out After sheet metal work done grille cloth must installed over speaker hole Any light weight black material will can secured place adhesive Remount speaker antenna antenna support latter will require small square hole will see once has removed its original loca tion can reattached silicone rubber clear plastic top made A-in Plexiglas absolute re quirement does add touch class held place two No 2 machine screws tapped top contest use top left screw removed cover pivoted out way Reconnect antenna speaker wires button up go look nearest contest Signal Attenuator promised mod have al ready used Airtronics Scanner close proximity flight line know sometimes subject swamping strong signals certain frequencies will cause er ratic operation scanner should ac tually used farther away flight line practical way contests have run problem also recognized Mr Bill Hersh berger able persons provided expertise AMA dur ing recent new frequency negotiations Bill has developed signal attenuator have incorporated switch in/out feature updated scanner will need three resistors switch latter installed rear cover scanner Notice weve turned cover around 180 degrees 12-volt input socket has moved way bottom attenuator switch located over switch used C&K DPDT Model No 1201 small high-quality switch ideal RC applications However cant obtain locally small DPDT slide toggle switch fits Continued page 176 November1984 173 ScannerlMare Continued page 173 available space will Notice sketch schematic wiring dia grams attenuator Install switch out circuit High knob down Low About 30dB attenuation obtained use allow monitor strong nearby signals switch attenuator collapse antenna Remember though makes scanner less sensitive weak out-of-the-area inter ference Periodically activity permits attenuator should switched out antenna extended check possible incoming interference Crystal Holder Now youve got -SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE N ERNA ONA CATALOG48500 MC KENZIE HWY $300VIDA OREGON 97488 SILICONE tr ID 062 092 125 U S POST 10 foot coils TUBING S/coil 235 265 3 2554 CO L [ LARRY DODGE ERG INC 10210 MANNINGSTILLWATER MN 5508 NOSTALGIC FLYING NEW VERSION OF ORIGINAL CHRISTMAS CARD TRU-FLITE MODEL FROM THE PAST reje When,. Pesos to, 40s Solids isto en eSeol,telv SeeottI tflee Model ttStOoOeI I5eo5 ~ oo~s Note usa GeetssteetetoIy dose 0e 24 Istshensekpe3 p2495 Box S2mn Rosaville MI 48066 TORK-STARTER $2995 Charger 11 tV 220V 1 2V Fast Charger $2095 Without Charger CHARGERS $1295 Charger Only Ill OV 220V 1 2V Past Charger 301 464-2260 nice new modern plug-in crystal attenu ated scanner youll getting complete set crystals go youll need way store transport identify May suggest Deluxe RC Crystal Caddy after brown bag has no class caddy started life off ubiqui tous plastic sandwich box snap-on cover nearest food store come sizes shapes choice Superseal #3427 nationally avail able however similar will onehas inside dimension 5%-in square insert based use another size merely adjust outside dimensions insert ac tual crystal holder youll need piece plastic least Y16-in thick Measure mark off material per diagram drill 36 holes required #56 bit exact crystal pin spacing 192 rather difficult lay out fractional scale accurate set pair dividers right dimen sion using crystal pins guide mark hole spacing labels crystal holder cut Airtronics Frequency Card can have asking order crystals Apply some thin double-sided tape rear card before cut out individual labels find Sonic-Tronics Crazy Tape excellent other modeling chores Keep protective covering until youve trimmed labels size trimmed drilled labeled crystal holder secured case sticky tape piece foam rubber attached cover keep crystals place during drive field Neat huh Cars boats Basically weve treated update aircraft frequencies since primary RC interest However scanner works equally well 75 MHz car boat frequencies can convert channels either methods described Air tronics does have Crystals hand same price correct labels found other side card Tuning future time feel scanner losing sensitivity first thing after verifying batteries good shape check tuning photos y5TE Easy use part no mix paint system No mixing No waiting Fast drying extremely fuel proof Formulated just modeler covers surfaces paints resins Send free instruction brochure BUY IT YOULL LIKE IT SIG MFG COMontezuma IA 50171 shows proper spots PC board whici can pick up modulated waveform thl detected output Tuning should done tin middle band using antenna-down trans mitter some distance away signal source Adjust RF IF transformers maxi mum signal scope Physically lo cated line starting vicinity antennl input towards center unit Crystals once again Airtronics has graciousl agreed furnish sets new frequency crys tals special prices duly registered plane boat car clubs Included also packagt will some molded crystal caps bt used originally-installed crystals whict have Write Airtronics curren information meantime isnt nice know thal something own thought ha obsoleted technology can updated tc fly again Parts update As writing two types ol crystal sockets erroneously listed HC-1S crystals must HC-25 made former cataloged Semi conductor Surplus 2822 North 32nd St Unit 1 Phoenix AZ 85008 priced 504 actually two $100 have sia minimum also always list lot useful items getting order level difficult Ask check catalog Scale WClWlschers Continued page 91 90 four-stroke Air made its exit through dummy exhaust stacks method could successful Englands cool weather high temperatures existed during three flying days Le Bourget Mick cooling problems noticeable loss engine rpm engine spaced back 15-in shaft extension model weight 129 lb meant engines full output needed maintain flying speed Mick con centrated using enough power result speed scalelike Features model handmade aluminum wheels tires molded Devcon RTV compound paper covering over balsa structure Hobbypoxy finish over dope-and-talc filler Brian Taylors Bristol Beaufighter second-highest static score along flight reasonably high quality As can expected Brian model exceptional Surprisingly 176 Model Aviation r Rk MFG OF NI STARTER $2995 Charger PLEASE SPECIFY WHICH CHARGER WHEN ORDERING TORK-STARTER revolutionary concept power 15V glow plugs model cars boats air planes using glow fuel engines TORK-STARTERITMI has steel wrench strong enough reduce compression easier starting ft supplies power vhII dolag comes new CIlO charger has LEO indicate unit charging also has removable T handle can used Torque amplifier Over 50 consecutive starts full charge rechargeable hundreds times Clips Onto plug positive connection Send ad along pre-paymens receive free shiooino handlino 12721 HASKELL LANE BOWIE MARYLAND 20716 L STICK&TISSUEMODELSFOAM SCALE ARE GREATMODELS new sheet foam bailds easier-Peanuts difference youll enloyat& Up lowest cost Several scale de signs available antique des sic warbirds 6 homebuilts Send $1O0forlatestplanslistfoam-samples discount coupon etcflex 652AM GETAFREECO-2MOTORSt CreSt Falls SW 54024
Edition: Model Aviation - 1984/11
Page Numbers: 76, 77, 78, 79, 172, 173, 176
Updating Old Airtronics Eloy Marez FREQUENCY SCANNER IpIIIII Dont despair have Airtronics Scanner original 72-75 MHz frequencies mods described article can adapt new channels came use last year THIS UNIT has become common sight contest frequency control tables rightfully provides muchneeded service price well within budget small clubs some individuals However recent assign ment first batch newlyreleased frequencies has partly entirely obsoleted older fine piece equipment number simple changes can made permit scanner continue work new future frequencies fact covers seven frequencies time now have 18 available much limiting factor hard conceive situations necessary fly planes given time have pleasure meeting Airtronics RC Frequency Scanner allow introduce scanner small 45 x 45 x 175-in self-contained frequency moni tor covers seven initially-assigned 72-75 MHz frequencies automatically scans band providing both visual aural indication signal being pres ent frequencies visual indicator red LED stays lit oc cupied frequency scanning con tinues unit can also placed manual control non-scan monitoring selected frequency volume control provided ample volume available nearby monitoring meter indicates relative signal strength 32-in collapsible whip antenna folds over lays across top cabinet Left The original Airtronics RC Frequency Scannerslightly outdated obsolete article tells may simply modi fled work new channels Top Right necessary crystals available Airtronics Shown crystals molded plastic caps marked channel identification Above Right Crystal sockets smali crys tals easiiy obtained Source both types shown required herein described updates inciuded text Left The crystal bank originally seen within scanner top rear view rear scanner Donom 720W MHZ crystal first left 75640 MHz crystal last right Right Bottom view printed circuit board showing crystal connections Note seven identical sections Arrows indicate lands crystals soldered 76 Model Aviation storage transportation Airtronics Scanner can operated either internal four-6ell Ni-Cd alkaline AA battery provided external 12volt supply latter cable furnished equipped cigarette lighter plug end coaxial power plug other mates matching receptacle rear panel Extensive volt age regulation usedfirst reduce 12 volts used further power crystal oscillat6rs some other internal circuit- ry latter will always receive exactly required voltage regardless supply low batteries requirement maximum frequency stability au dio amplifier works off unregulated voltage its operation will affected lower voltage available Ni-Cds 48 com pared alkalines 60 However relatively low er voltage resulting can compensated merely advancing vol ume control wee bit length operating time per set cells diffi cult calculate exactly scanner draws 50 milliamps during periods no-signal rising about 130 whei signal heard further af fected setting volume control Theoretically set properly charged Ni-Cds good condition could last long 10 hours low volume setting though would estimate five six hours realistic figure Alkalines can expected last 1 2 times longer desired scanner could operat ed directly external large capacity 32 NEW ANTENNA SUPPRT LOCATION DRILL 1/8 HOLE // FILE TO I/B SQUARE FOR ONBOTTOMOFN i7 SUPPORTN/ 32 SPEAKER & ANTENNA BASE MOUNTING HO LES #30 PLEXIGLASS COVER HOLES DRILL & TAP FOR #2 SCREW PLEXIGLASS COVER 1/4 LARGER THAN OPENING 11D EAKER L____1 CRYSTALS - S 15 . ii 32 1 2 Full-size drawing top section scanner caseshowing location new openings required described modifications Top/bottom sections interchanged full-replaceable-Orystai mods four-cell Ni-Cd pack case power cable could brought rear unit through grommet-protected hole mated directly plug internal batteries connect use 12-volt source contemplat ed socket provided its input could rewired accept four-cell external pack Merely disconnect insulate wires already socket connect red wire its center post point connection red wire ternal battery black wire should run outside contact socket connect black wire inter nal battery correct input polarity matching plug must also maintained Minor frequency changes Lets get Left Crystal bank shown crystal socket installed allow plug-in crystal changes easiest partial conversion Right Crystai bankwlth plug-in crystal itssocket Solution thetext installing seven side-by-side plug-in crystalswith identifying capsattached November 1984 77 Lower left rear bottom main printed circuit board showing location holes required mounting crystal socket assembly 470 II OUTTO SCANNER ANTENNA INPUT I5OO~ ANTENNA 47\ DPDT SWITCH Basic RF attenuator circuitand diagram showing can switched out double-pole double-throw switch what can update scanner operate new frequencies several options depending needs Fortunately circuitry will require changes 72-75 MHz fre quencies covered equal efficien -- GROUND cy Therefore changes made mostly mechanical should scare off first step obviously take unit apart top bottom halves come off after removing four sheet metal screws side rear cover comes off instance described later taking off top bottom enough now First individual needs change frequency able monitor new system small club needs cover couple new frequencies change simple just remove replace Remove old crystal replace new too have option can just solder new crystal place can install socket fast future replace ment field subject crystals crystal other name may sometimes rose other words crystals work correctly circuits something called overtones number times fundamental crystal fre quency multiplied arrive operating frequency case funda mental frequency crystal seems used overtone crystals spares box will work So safer order whatever need Airtronics dealer directly company stocks frequencies new old $750 Left Crystal socket board position over original crystal location within scanner installed small spacers 4-40 screws piastic washers nuts Right top updated scanner showing new plug-In crystal board plastic cover new location antenna mount speaker speaker grilicloth has added 78 Model Aviation Above Perforated electronic prototype board base new crystal socket board Use cutting drilling guide Note hole sizes Right Crystal socket board sockets taching wires place Solid wires will inserted soldered holes originally used seven basic frequency crystals Specify receiver crystal order prefer solder new decide old frequencies sacrificed locate its crystal within scanner referring originallyinstalled crystals lets think fre quencies covered 1 through 7 looking front frequency-indicating LEDs Thus 72080 No 1 forth 75640 No 7 Looking photo printed circuit board lower right rear note lands crystals soldered Note nine identical sections though seven have components installed position scanner crystal positions coincide frequency LEDs No 1 left etc However looking top scanner front inver sion No 7 now first left etc Anyway remove unwanted crystals Use small iron find rated 12 watts enough Dont use 4 5/8 4 5/8 9/16 CRYSTAL PIN HOLES 7/ 3 3/8 611 *-I 1/16 X5 Layout crystal holder board used crystal caddy sandwich box Make holder 3/16-In plastic Pin spacing 192 use dividers mark holes accurately soldering gun save working radiators gutters Use solder removal wicks such Radio Shack No 64-2090 remove solder crystal pins lands Continued page 172 Left Crystal holder insert described made 3/16-in plastic labeis cut Alrtronics frequency card tached Sonic-Tronics Crazy Tape Right Anyone crystal sandwich crystal holder shown mounted inside plastic snap-cover sandwich box system crystal location identification accomplished easily Au photographs author November 1984 79 Left Rear cover turned 180 allow lower relocation 1 2V put plug bottom pansi Above newiy-lnstaiied RF attenu ator switch per text Above scanner loses sensitivity first test batteries check tuning Arrows indicate 1 RF enveiope 2 detected output pickup pointson board NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling Item 13 shown Sheet 1 plans Install hook fuselage shown Detail Install #6 x %-in screw A6-in hole drilled earlierscrew until protrudes 1A-in screw will used stop hook down position Wrap solder length A2-in music wire elevator pushrod bend hold tail hook up position Trim end wire hook will drop elevator full-down position see Detail B Item 20 Loop rubberband around hook engage screw extending round doubler Engage hook elevator pushrod recheck will drop full-down elevator Finishing Remove engine hook tail gear Cover wings silkspan equivalent material Paint upper part fuselage blue-gray lower part light gray plan shows approximate line separates colors upper part wing blue-gray bottom light gray canopy windows white Apply white fuselage lettering star insignias latter red white blue colors Apply 1 oz stick-on lead weight underside right wing tip stall engine fuel tank hook tail gear Check model balances within / center gravity CG loca tion shown Sheet 1 plans Apply nose tail weight needed achieve desired balance point Flying little Dauntless very stable flight lifts off deck very quickly settles down smooth high-speed flight Speeds 60 70 mph easily attained have flown Dauntless 70 mph take first place club contests Slowing down Dauntless lowspeed flight quite uneventful little ship requires small amount upelevator hold reduced speed practice can really get nose up correct throttle control being applied Landing best part Just pick Z495 $3295 $3995 Dealers inquiries invited spot chop throttle let settle Its easy make three-point landings model hope enjoy flying 15 Dauntless much have Happy landings ScannerlMarez Continued page 79 quickly possible crystals damaged soldering de-soldering like electronic components dont really like long sustained applica tions high temperatures Fortunately pins installed crystals cut off can re-use sockets after cleaning solder off Assuming interested couple new frequencies may opt solder new crystals point However interest cludes sockets should first talk about crystals little bit First former two types sockets available has same pin diameter spacing crystals will drop right hole printed circuit board Another has wide flat pins wider spacing will Both available Kraft Systems boardmounted type need point Part No 120-074 $300 other type use will described later Part No 120-141K $100 Small crystal sockets such something rarity dont bother looking Radio Shack small electronics supply houses Back crystals again recom mendation get Airtronics insist different source need HC-25/U type accept HC 18/U same size has long wires instead pins unless definitely intend solder Airtronics crystals come nice neat molded plastic cap identified colors channel numbers tremendous help especially have decided plug-in field changes ever cap too wide allow seven plug-in crystals space provided PC board can install sockets ProTt MO MOLDED STRONG -METAL FRAMEGREAT GIFT 5 FOAM FILLED Transmitter ection Case X PRICE $35 Include Shipping & Kondling US CA re odd 6% Send check yr 0 5 ERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 other position four plug-ins enough satisfy requirements can trim lip sides th molded cap narrows enough allow seven side-by-side crystals However previous men tion plug-in crystals will still need remove top cover whenever fre quency change required too slow involved constant changes required scanner ing used active contest situa tion will get worse new frequencies phased have developed ultimate update will now described Full-house update Basically will stall support-mounted crystal socket board high enough permit easy crystal identification changes clear plastic window will provided checking installed crystals new board being larger space initially used original crystal circuitry will require relocation speaker antenna mount Dont put off scary-sounding things recommended changes still mainly mechanical no volved electronics changes being required Start taking off top bottom covers rear panel Unsolder wires speaker antenna connec tor remove 12-volt power input jack panel Using small iron solder wick remove seven crystals board clean solder completely off pins best done applying bit paste solder flux heat wiping off melt ed solder rag careful leave solder bridges board dur ing desoldening operation make crystal socket board youll need piece 1-in spacing elec tronic prototype perforated board prefer ably epoxy-based type cheaper phenolic board acceptable though does drill cut cleanly epoxy strong Cut size 14 x 32 holes shown photo Referring again photo note locations new holes drill indicated Note 14 crystal 172 Model Aviation xket holes drilled existing ole locations other two mounting oles located between already-existing oles Two holes have drilled scan er PC board adjacent initially stalled crystals Note diagram e exact location holes hole earest corner board will cut irough unused board land dont oncerned about innermost hole rill cut land large diode nd red wire connected little irgery required Remove iode completely off board tall opposite end completely down ne board land its bent ver lead soldered Resolder clip ntis wire red wire now soldered ne top diode lead thus making same riginal connections provides ecessary room spacer ne crystal socket board rests board supported 46-in spacers 4-40 rews through holes sockets required flat pin pe Kraft No 120-141K should istalled board time using ery small drop cyanoacrylate t wick up sockets pins nien folded inward secure erf board 1-in length unin ilated solid wire No 22 24 oldered socket pin per hoto Now mate two assemblies Hold socket board above scanner board tarting inside insert first wo wires connected socket nenter pair crystal pin holes Work ucceeding pair wires respec ive holes pair tweezers good ighting necessary requirements Push board place install Y6-in pacers 4-40 bolts tighten lace make sure wires uckle bend other nylon r fiber washer should used under -40 nut land side scanner oard provide insulation scan er found couple tall apacitors located just inboard rystals installed directly board high enough inter rere new socket board run nto locate lands apacitors installed heat solder onnections push down board Lightly pull wire comes through board pair should equal length Solder clip off ex ess wire clean off remaining solder flux alcohol stiff brush cheap -in brush bristles cut off V2-in length ideal such purposes point good idea recon nect speaker battery plug crystals check scanner normal operation Note again looking scanner normal operators view indicating LEDs read left right order ascending frequen cy crystal location however right left other words crystal 72080 first LED left last crystal line right Since frequencies indicated front panel will no longer apply cases best re-label 1-7 merely help maintain relationship between installed crystals LEDs still modification consider case far wish go well help finish off will now remount antenna anten na support speaker make ac cess hole crystals First remove hardware top cover Once clean consider installing stick-on bolt-on rubber foot corner since now holding bottom scanner Yep switching top bottom holes original top lend themselves new open ings required Refer sketch dimensions locations new openings go Unfortunately covers aluminum steel however particularly hard can cut fine-tooth blade Dremel saw finished off files group has active Ham electronics hobbyist ask him has Greenlee chassis punches screw-operated devices made just purpose cut accurate clean distor tion-free holes used 1-in round punch speaker hole. rectangle made 1-in square punch used both ends middle sawed filed out After sheet metal work done grille cloth must installed over speaker hole Any light weight black material will can secured place adhesive Remount speaker antenna antenna support latter will require small square hole will see once has removed its original loca tion can reattached silicone rubber clear plastic top made A-in Plexiglas absolute re quirement does add touch class held place two No 2 machine screws tapped top contest use top left screw removed cover pivoted out way Reconnect antenna speaker wires button up go look nearest contest Signal Attenuator promised mod have al ready used Airtronics Scanner close proximity flight line know sometimes subject swamping strong signals certain frequencies will cause er ratic operation scanner should ac tually used farther away flight line practical way contests have run problem also recognized Mr Bill Hersh berger able persons provided expertise AMA dur ing recent new frequency negotiations Bill has developed signal attenuator have incorporated switch in/out feature updated scanner will need three resistors switch latter installed rear cover scanner Notice weve turned cover around 180 degrees 12-volt input socket has moved way bottom attenuator switch located over switch used C&K DPDT Model No 1201 small high-quality switch ideal RC applications However cant obtain locally small DPDT slide toggle switch fits Continued page 176 November1984 173 ScannerlMare Continued page 173 available space will Notice sketch schematic wiring dia grams attenuator Install switch out circuit High knob down Low About 30dB attenuation obtained use allow monitor strong nearby signals switch attenuator collapse antenna Remember though makes scanner less sensitive weak out-of-the-area inter ference Periodically activity permits attenuator should switched out antenna extended check possible incoming interference Crystal Holder Now youve got -SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE N ERNA ONA CATALOG48500 MC KENZIE HWY $300VIDA OREGON 97488 SILICONE tr ID 062 092 125 U S POST 10 foot coils TUBING S/coil 235 265 3 2554 CO L [ LARRY DODGE ERG INC 10210 MANNINGSTILLWATER MN 5508 NOSTALGIC FLYING NEW VERSION OF ORIGINAL CHRISTMAS CARD TRU-FLITE MODEL FROM THE PAST reje When,. Pesos to, 40s Solids isto en eSeol,telv SeeottI tflee Model ttStOoOeI I5eo5 ~ oo~s Note usa GeetssteetetoIy dose 0e 24 Istshensekpe3 p2495 Box S2mn Rosaville MI 48066 TORK-STARTER $2995 Charger 11 tV 220V 1 2V Fast Charger $2095 Without Charger CHARGERS $1295 Charger Only Ill OV 220V 1 2V Past Charger 301 464-2260 nice new modern plug-in crystal attenu ated scanner youll getting complete set crystals go youll need way store transport identify May suggest Deluxe RC Crystal Caddy after brown bag has no class caddy started life off ubiqui tous plastic sandwich box snap-on cover nearest food store come sizes shapes choice Superseal #3427 nationally avail able however similar will onehas inside dimension 5%-in square insert based use another size merely adjust outside dimensions insert ac tual crystal holder youll need piece plastic least Y16-in thick Measure mark off material per diagram drill 36 holes required #56 bit exact crystal pin spacing 192 rather difficult lay out fractional scale accurate set pair dividers right dimen sion using crystal pins guide mark hole spacing labels crystal holder cut Airtronics Frequency Card can have asking order crystals Apply some thin double-sided tape rear card before cut out individual labels find Sonic-Tronics Crazy Tape excellent other modeling chores Keep protective covering until youve trimmed labels size trimmed drilled labeled crystal holder secured case sticky tape piece foam rubber attached cover keep crystals place during drive field Neat huh Cars boats Basically weve treated update aircraft frequencies since primary RC interest However scanner works equally well 75 MHz car boat frequencies can convert channels either methods described Air tronics does have Crystals hand same price correct labels found other side card Tuning future time feel scanner losing sensitivity first thing after verifying batteries good shape check tuning photos y5TE Easy use part no mix paint system No mixing No waiting Fast drying extremely fuel proof Formulated just modeler covers surfaces paints resins Send free instruction brochure BUY IT YOULL LIKE IT SIG MFG COMontezuma IA 50171 shows proper spots PC board whici can pick up modulated waveform thl detected output Tuning should done tin middle band using antenna-down trans mitter some distance away signal source Adjust RF IF transformers maxi mum signal scope Physically lo cated line starting vicinity antennl input towards center unit Crystals once again Airtronics has graciousl agreed furnish sets new frequency crys tals special prices duly registered plane boat car clubs Included also packagt will some molded crystal caps bt used originally-installed crystals whict have Write Airtronics curren information meantime isnt nice know thal something own thought ha obsoleted technology can updated tc fly again Parts update As writing two types ol crystal sockets erroneously listed HC-1S crystals must HC-25 made former cataloged Semi conductor Surplus 2822 North 32nd St Unit 1 Phoenix AZ 85008 priced 504 actually two $100 have sia minimum also always list lot useful items getting order level difficult Ask check catalog Scale WClWlschers Continued page 91 90 four-stroke Air made its exit through dummy exhaust stacks method could successful Englands cool weather high temperatures existed during three flying days Le Bourget Mick cooling problems noticeable loss engine rpm engine spaced back 15-in shaft extension model weight 129 lb meant engines full output needed maintain flying speed Mick con centrated using enough power result speed scalelike Features model handmade aluminum wheels tires molded Devcon RTV compound paper covering over balsa structure Hobbypoxy finish over dope-and-talc filler Brian Taylors Bristol Beaufighter second-highest static score along flight reasonably high quality As can expected Brian model exceptional Surprisingly 176 Model Aviation r Rk MFG OF NI STARTER $2995 Charger PLEASE SPECIFY WHICH CHARGER WHEN ORDERING TORK-STARTER revolutionary concept power 15V glow plugs model cars boats air planes using glow fuel engines TORK-STARTERITMI has steel wrench strong enough reduce compression easier starting ft supplies power vhII dolag comes new CIlO charger has LEO indicate unit charging also has removable T handle can used Torque amplifier Over 50 consecutive starts full charge rechargeable hundreds times Clips Onto plug positive connection Send ad along pre-paymens receive free shiooino handlino 12721 HASKELL LANE BOWIE MARYLAND 20716 L STICK&TISSUEMODELSFOAM SCALE ARE GREATMODELS new sheet foam bailds easier-Peanuts difference youll enloyat& Up lowest cost Several scale de signs available antique des sic warbirds 6 homebuilts Send $1O0forlatestplanslistfoam-samples discount coupon etcflex 652AM GETAFREECO-2MOTORSt CreSt Falls SW 54024
Edition: Model Aviation - 1984/11
Page Numbers: 76, 77, 78, 79, 172, 173, 176
Updating Old Airtronics Eloy Marez FREQUENCY SCANNER IpIIIII Dont despair have Airtronics Scanner original 72-75 MHz frequencies mods described article can adapt new channels came use last year THIS UNIT has become common sight contest frequency control tables rightfully provides muchneeded service price well within budget small clubs some individuals However recent assign ment first batch newlyreleased frequencies has partly entirely obsoleted older fine piece equipment number simple changes can made permit scanner continue work new future frequencies fact covers seven frequencies time now have 18 available much limiting factor hard conceive situations necessary fly planes given time have pleasure meeting Airtronics RC Frequency Scanner allow introduce scanner small 45 x 45 x 175-in self-contained frequency moni tor covers seven initially-assigned 72-75 MHz frequencies automatically scans band providing both visual aural indication signal being pres ent frequencies visual indicator red LED stays lit oc cupied frequency scanning con tinues unit can also placed manual control non-scan monitoring selected frequency volume control provided ample volume available nearby monitoring meter indicates relative signal strength 32-in collapsible whip antenna folds over lays across top cabinet Left The original Airtronics RC Frequency Scannerslightly outdated obsolete article tells may simply modi fled work new channels Top Right necessary crystals available Airtronics Shown crystals molded plastic caps marked channel identification Above Right Crystal sockets smali crys tals easiiy obtained Source both types shown required herein described updates inciuded text Left The crystal bank originally seen within scanner top rear view rear scanner Donom 720W MHZ crystal first left 75640 MHz crystal last right Right Bottom view printed circuit board showing crystal connections Note seven identical sections Arrows indicate lands crystals soldered 76 Model Aviation storage transportation Airtronics Scanner can operated either internal four-6ell Ni-Cd alkaline AA battery provided external 12volt supply latter cable furnished equipped cigarette lighter plug end coaxial power plug other mates matching receptacle rear panel Extensive volt age regulation usedfirst reduce 12 volts used further power crystal oscillat6rs some other internal circuit- ry latter will always receive exactly required voltage regardless supply low batteries requirement maximum frequency stability au dio amplifier works off unregulated voltage its operation will affected lower voltage available Ni-Cds 48 com pared alkalines 60 However relatively low er voltage resulting can compensated merely advancing vol ume control wee bit length operating time per set cells diffi cult calculate exactly scanner draws 50 milliamps during periods no-signal rising about 130 whei signal heard further af fected setting volume control Theoretically set properly charged Ni-Cds good condition could last long 10 hours low volume setting though would estimate five six hours realistic figure Alkalines can expected last 1 2 times longer desired scanner could operat ed directly external large capacity 32 NEW ANTENNA SUPPRT LOCATION DRILL 1/8 HOLE // FILE TO I/B SQUARE FOR ONBOTTOMOFN i7 SUPPORTN/ 32 SPEAKER & ANTENNA BASE MOUNTING HO LES #30 PLEXIGLASS COVER HOLES DRILL & TAP FOR #2 SCREW PLEXIGLASS COVER 1/4 LARGER THAN OPENING 11D EAKER L____1 CRYSTALS - S 15 . ii 32 1 2 Full-size drawing top section scanner caseshowing location new openings required described modifications Top/bottom sections interchanged full-replaceable-Orystai mods four-cell Ni-Cd pack case power cable could brought rear unit through grommet-protected hole mated directly plug internal batteries connect use 12-volt source contemplat ed socket provided its input could rewired accept four-cell external pack Merely disconnect insulate wires already socket connect red wire its center post point connection red wire ternal battery black wire should run outside contact socket connect black wire inter nal battery correct input polarity matching plug must also maintained Minor frequency changes Lets get Left Crystal bank shown crystal socket installed allow plug-in crystal changes easiest partial conversion Right Crystai bankwlth plug-in crystal itssocket Solution thetext installing seven side-by-side plug-in crystalswith identifying capsattached November 1984 77 Lower left rear bottom main printed circuit board showing location holes required mounting crystal socket assembly 470 II OUTTO SCANNER ANTENNA INPUT I5OO~ ANTENNA 47\ DPDT SWITCH Basic RF attenuator circuitand diagram showing can switched out double-pole double-throw switch what can update scanner operate new frequencies several options depending needs Fortunately circuitry will require changes 72-75 MHz fre quencies covered equal efficien -- GROUND cy Therefore changes made mostly mechanical should scare off first step obviously take unit apart top bottom halves come off after removing four sheet metal screws side rear cover comes off instance described later taking off top bottom enough now First individual needs change frequency able monitor new system small club needs cover couple new frequencies change simple just remove replace Remove old crystal replace new too have option can just solder new crystal place can install socket fast future replace ment field subject crystals crystal other name may sometimes rose other words crystals work correctly circuits something called overtones number times fundamental crystal fre quency multiplied arrive operating frequency case funda mental frequency crystal seems used overtone crystals spares box will work So safer order whatever need Airtronics dealer directly company stocks frequencies new old $750 Left Crystal socket board position over original crystal location within scanner installed small spacers 4-40 screws piastic washers nuts Right top updated scanner showing new plug-In crystal board plastic cover new location antenna mount speaker speaker grilicloth has added 78 Model Aviation Above Perforated electronic prototype board base new crystal socket board Use cutting drilling guide Note hole sizes Right Crystal socket board sockets taching wires place Solid wires will inserted soldered holes originally used seven basic frequency crystals Specify receiver crystal order prefer solder new decide old frequencies sacrificed locate its crystal within scanner referring originallyinstalled crystals lets think fre quencies covered 1 through 7 looking front frequency-indicating LEDs Thus 72080 No 1 forth 75640 No 7 Looking photo printed circuit board lower right rear note lands crystals soldered Note nine identical sections though seven have components installed position scanner crystal positions coincide frequency LEDs No 1 left etc However looking top scanner front inver sion No 7 now first left etc Anyway remove unwanted crystals Use small iron find rated 12 watts enough Dont use 4 5/8 4 5/8 9/16 CRYSTAL PIN HOLES 7/ 3 3/8 611 *-I 1/16 X5 Layout crystal holder board used crystal caddy sandwich box Make holder 3/16-In plastic Pin spacing 192 use dividers mark holes accurately soldering gun save working radiators gutters Use solder removal wicks such Radio Shack No 64-2090 remove solder crystal pins lands Continued page 172 Left Crystal holder insert described made 3/16-in plastic labeis cut Alrtronics frequency card tached Sonic-Tronics Crazy Tape Right Anyone crystal sandwich crystal holder shown mounted inside plastic snap-cover sandwich box system crystal location identification accomplished easily Au photographs author November 1984 79 Left Rear cover turned 180 allow lower relocation 1 2V put plug bottom pansi Above newiy-lnstaiied RF attenu ator switch per text Above scanner loses sensitivity first test batteries check tuning Arrows indicate 1 RF enveiope 2 detected output pickup pointson board NEW MK 2 H & K SUPER STARTERS Look before leap original still best Has new larger clutch fully supported applications 90 day warranty new lower prices MODEL 1 Q-35 Q-50 ZENOAH ROPER MODEL 2Super Hustler MAG II MODEL 3Tartan Twin Super Twin Glow Manufactured Distributed P K Products PO Box 62260 Hayward CA 945400 415 581-4277 Add $150 postage handling Item 13 shown Sheet 1 plans Install hook fuselage shown Detail Install #6 x %-in screw A6-in hole drilled earlierscrew until protrudes 1A-in screw will used stop hook down position Wrap solder length A2-in music wire elevator pushrod bend hold tail hook up position Trim end wire hook will drop elevator full-down position see Detail B Item 20 Loop rubberband around hook engage screw extending round doubler Engage hook elevator pushrod recheck will drop full-down elevator Finishing Remove engine hook tail gear Cover wings silkspan equivalent material Paint upper part fuselage blue-gray lower part light gray plan shows approximate line separates colors upper part wing blue-gray bottom light gray canopy windows white Apply white fuselage lettering star insignias latter red white blue colors Apply 1 oz stick-on lead weight underside right wing tip stall engine fuel tank hook tail gear Check model balances within / center gravity CG loca tion shown Sheet 1 plans Apply nose tail weight needed achieve desired balance point Flying little Dauntless very stable flight lifts off deck very quickly settles down smooth high-speed flight Speeds 60 70 mph easily attained have flown Dauntless 70 mph take first place club contests Slowing down Dauntless lowspeed flight quite uneventful little ship requires small amount upelevator hold reduced speed practice can really get nose up correct throttle control being applied Landing best part Just pick Z495 $3295 $3995 Dealers inquiries invited spot chop throttle let settle Its easy make three-point landings model hope enjoy flying 15 Dauntless much have Happy landings ScannerlMarez Continued page 79 quickly possible crystals damaged soldering de-soldering like electronic components dont really like long sustained applica tions high temperatures Fortunately pins installed crystals cut off can re-use sockets after cleaning solder off Assuming interested couple new frequencies may opt solder new crystals point However interest cludes sockets should first talk about crystals little bit First former two types sockets available has same pin diameter spacing crystals will drop right hole printed circuit board Another has wide flat pins wider spacing will Both available Kraft Systems boardmounted type need point Part No 120-074 $300 other type use will described later Part No 120-141K $100 Small crystal sockets such something rarity dont bother looking Radio Shack small electronics supply houses Back crystals again recom mendation get Airtronics insist different source need HC-25/U type accept HC 18/U same size has long wires instead pins unless definitely intend solder Airtronics crystals come nice neat molded plastic cap identified colors channel numbers tremendous help especially have decided plug-in field changes ever cap too wide allow seven plug-in crystals space provided PC board can install sockets ProTt MO MOLDED STRONG -METAL FRAMEGREAT GIFT 5 FOAM FILLED Transmitter ection Case X PRICE $35 Include Shipping & Kondling US CA re odd 6% Send check yr 0 5 ERON ENTERPRISES 443 ROBERTAFULLERTON CA 92632 other position four plug-ins enough satisfy requirements can trim lip sides th molded cap narrows enough allow seven side-by-side crystals However previous men tion plug-in crystals will still need remove top cover whenever fre quency change required too slow involved constant changes required scanner ing used active contest situa tion will get worse new frequencies phased have developed ultimate update will now described Full-house update Basically will stall support-mounted crystal socket board high enough permit easy crystal identification changes clear plastic window will provided checking installed crystals new board being larger space initially used original crystal circuitry will require relocation speaker antenna mount Dont put off scary-sounding things recommended changes still mainly mechanical no volved electronics changes being required Start taking off top bottom covers rear panel Unsolder wires speaker antenna connec tor remove 12-volt power input jack panel Using small iron solder wick remove seven crystals board clean solder completely off pins best done applying bit paste solder flux heat wiping off melt ed solder rag careful leave solder bridges board dur ing desoldening operation make crystal socket board youll need piece 1-in spacing elec tronic prototype perforated board prefer ably epoxy-based type cheaper phenolic board acceptable though does drill cut cleanly epoxy strong Cut size 14 x 32 holes shown photo Referring again photo note locations new holes drill indicated Note 14 crystal 172 Model Aviation xket holes drilled existing ole locations other two mounting oles located between already-existing oles Two holes have drilled scan er PC board adjacent initially stalled crystals Note diagram e exact location holes hole earest corner board will cut irough unused board land dont oncerned about innermost hole rill cut land large diode nd red wire connected little irgery required Remove iode completely off board tall opposite end completely down ne board land its bent ver lead soldered Resolder clip ntis wire red wire now soldered ne top diode lead thus making same riginal connections provides ecessary room spacer ne crystal socket board rests board supported 46-in spacers 4-40 rews through holes sockets required flat pin pe Kraft No 120-141K should istalled board time using ery small drop cyanoacrylate t wick up sockets pins nien folded inward secure erf board 1-in length unin ilated solid wire No 22 24 oldered socket pin per hoto Now mate two assemblies Hold socket board above scanner board tarting inside insert first wo wires connected socket nenter pair crystal pin holes Work ucceeding pair wires respec ive holes pair tweezers good ighting necessary requirements Push board place install Y6-in pacers 4-40 bolts tighten lace make sure wires uckle bend other nylon r fiber washer should used under -40 nut land side scanner oard provide insulation scan er found couple tall apacitors located just inboard rystals installed directly board high enough inter rere new socket board run nto locate lands apacitors installed heat solder onnections push down board Lightly pull wire comes through board pair should equal length Solder clip off ex ess wire clean off remaining solder flux alcohol stiff brush cheap -in brush bristles cut off V2-in length ideal such purposes point good idea recon nect speaker battery plug crystals check scanner normal operation Note again looking scanner normal operators view indicating LEDs read left right order ascending frequen cy crystal location however right left other words crystal 72080 first LED left last crystal line right Since frequencies indicated front panel will no longer apply cases best re-label 1-7 merely help maintain relationship between installed crystals LEDs still modification consider case far wish go well help finish off will now remount antenna anten na support speaker make ac cess hole crystals First remove hardware top cover Once clean consider installing stick-on bolt-on rubber foot corner since now holding bottom scanner Yep switching top bottom holes original top lend themselves new open ings required Refer sketch dimensions locations new openings go Unfortunately covers aluminum steel however particularly hard can cut fine-tooth blade Dremel saw finished off files group has active Ham electronics hobbyist ask him has Greenlee chassis punches screw-operated devices made just purpose cut accurate clean distor tion-free holes used 1-in round punch speaker hole. rectangle made 1-in square punch used both ends middle sawed filed out After sheet metal work done grille cloth must installed over speaker hole Any light weight black material will can secured place adhesive Remount speaker antenna antenna support latter will require small square hole will see once has removed its original loca tion can reattached silicone rubber clear plastic top made A-in Plexiglas absolute re quirement does add touch class held place two No 2 machine screws tapped top contest use top left screw removed cover pivoted out way Reconnect antenna speaker wires button up go look nearest contest Signal Attenuator promised mod have al ready used Airtronics Scanner close proximity flight line know sometimes subject swamping strong signals certain frequencies will cause er ratic operation scanner should ac tually used farther away flight line practical way contests have run problem also recognized Mr Bill Hersh berger able persons provided expertise AMA dur ing recent new frequency negotiations Bill has developed signal attenuator have incorporated switch in/out feature updated scanner will need three resistors switch latter installed rear cover scanner Notice weve turned cover around 180 degrees 12-volt input socket has moved way bottom attenuator switch located over switch used C&K DPDT Model No 1201 small high-quality switch ideal RC applications However cant obtain locally small DPDT slide toggle switch fits Continued page 176 November1984 173 ScannerlMare Continued page 173 available space will Notice sketch schematic wiring dia grams attenuator Install switch out circuit High knob down Low About 30dB attenuation obtained use allow monitor strong nearby signals switch attenuator collapse antenna Remember though makes scanner less sensitive weak out-of-the-area inter ference Periodically activity permits attenuator should switched out antenna extended check possible incoming interference Crystal Holder Now youve got -SCALE DOCUMENTATION SCALE DRAWINGSMODEL PLANS PHOTOS BOOKS EPLA TECH 1984 AIRPLANE N ERNA ONA CATALOG48500 MC KENZIE HWY $300VIDA OREGON 97488 SILICONE tr ID 062 092 125 U S POST 10 foot coils TUBING S/coil 235 265 3 2554 CO L [ LARRY DODGE ERG INC 10210 MANNINGSTILLWATER MN 5508 NOSTALGIC FLYING NEW VERSION OF ORIGINAL CHRISTMAS CARD TRU-FLITE MODEL FROM THE PAST reje When,. Pesos to, 40s Solids isto en eSeol,telv SeeottI tflee Model ttStOoOeI I5eo5 ~ oo~s Note usa GeetssteetetoIy dose 0e 24 Istshensekpe3 p2495 Box S2mn Rosaville MI 48066 TORK-STARTER $2995 Charger 11 tV 220V 1 2V Fast Charger $2095 Without Charger CHARGERS $1295 Charger Only Ill OV 220V 1 2V Past Charger 301 464-2260 nice new modern plug-in crystal attenu ated scanner youll getting complete set crystals go youll need way store transport identify May suggest Deluxe RC Crystal Caddy after brown bag has no class caddy started life off ubiqui tous plastic sandwich box snap-on cover nearest food store come sizes shapes choice Superseal #3427 nationally avail able however similar will onehas inside dimension 5%-in square insert based use another size merely adjust outside dimensions insert ac tual crystal holder youll need piece plastic least Y16-in thick Measure mark off material per diagram drill 36 holes required #56 bit exact crystal pin spacing 192 rather difficult lay out fractional scale accurate set pair dividers right dimen sion using crystal pins guide mark hole spacing labels crystal holder cut Airtronics Frequency Card can have asking order crystals Apply some thin double-sided tape rear card before cut out individual labels find Sonic-Tronics Crazy Tape excellent other modeling chores Keep protective covering until youve trimmed labels size trimmed drilled labeled crystal holder secured case sticky tape piece foam rubber attached cover keep crystals place during drive field Neat huh Cars boats Basically weve treated update aircraft frequencies since primary RC interest However scanner works equally well 75 MHz car boat frequencies can convert channels either methods described Air tronics does have Crystals hand same price correct labels found other side card Tuning future time feel scanner losing sensitivity first thing after verifying batteries good shape check tuning photos y5TE Easy use part no mix paint system No mixing No waiting Fast drying extremely fuel proof Formulated just modeler covers surfaces paints resins Send free instruction brochure BUY IT YOULL LIKE IT SIG MFG COMontezuma IA 50171 shows proper spots PC board whici can pick up modulated waveform thl detected output Tuning should done tin middle band using antenna-down trans mitter some distance away signal source Adjust RF IF transformers maxi mum signal scope Physically lo cated line starting vicinity antennl input towards center unit Crystals once again Airtronics has graciousl agreed furnish sets new frequency crys tals special prices duly registered plane boat car clubs Included also packagt will some molded crystal caps bt used originally-installed crystals whict have Write Airtronics curren information meantime isnt nice know thal something own thought ha obsoleted technology can updated tc fly again Parts update As writing two types ol crystal sockets erroneously listed HC-1S crystals must HC-25 made former cataloged Semi conductor Surplus 2822 North 32nd St Unit 1 Phoenix AZ 85008 priced 504 actually two $100 have sia minimum also always list lot useful items getting order level difficult Ask check catalog Scale WClWlschers Continued page 91 90 four-stroke Air made its exit through dummy exhaust stacks method could successful Englands cool weather high temperatures existed during three flying days Le Bourget Mick cooling problems noticeable loss engine rpm engine spaced back 15-in shaft extension model weight 129 lb meant engines full output needed maintain flying speed Mick con centrated using enough power result speed scalelike Features model handmade aluminum wheels tires molded Devcon RTV compound paper covering over balsa structure Hobbypoxy finish over dope-and-talc filler Brian Taylors Bristol Beaufighter second-highest static score along flight reasonably high quality As can expected Brian model exceptional Surprisingly 176 Model Aviation r Rk MFG OF NI STARTER $2995 Charger PLEASE SPECIFY WHICH CHARGER WHEN ORDERING TORK-STARTER revolutionary concept power 15V glow plugs model cars boats air planes using glow fuel engines TORK-STARTERITMI has steel wrench strong enough reduce compression easier starting ft supplies power vhII dolag comes new CIlO charger has LEO indicate unit charging also has removable T handle can used Torque amplifier Over 50 consecutive starts full charge rechargeable hundreds times Clips Onto plug positive connection Send ad along pre-paymens receive free shiooino handlino 12721 HASKELL LANE BOWIE MARYLAND 20716 L STICK&TISSUEMODELSFOAM SCALE ARE GREATMODELS new sheet foam bailds easier-Peanuts difference youll enloyat& Up lowest cost Several scale de signs available antique des sic warbirds 6 homebuilts Send $1O0forlatestplanslistfoam-samples discount coupon etcflex 652AM GETAFREECO-2MOTORSt CreSt Falls SW 54024