a loec ni ue George M Myers TUNING YOUR RECEIVER often receive another pound newsletters AMA HQ Based what read some folks overreacting possible RC interference good aware what may happen think wrong tell ourselves will always happen thereby start limiting ourselves un necessarily point fact have flying new RC channels past six months have deliberately invited kind potential interference Ive seen discussed So far using radios built 1970 1976 1978 1980 1982 setting up adjacent-channel 40 KHz interference second-order third-order intermodulation image main thing Ive discovered isnt problem test results mean anything say old radios will work fine new RC Problem AdjacentChannel Interference 2nd Order Intermodula tion 3rd Order Intermodula tion Image 7304o 730464 730454 7287 4 7287 7259 7 73045 7259 7240 CoNTRoL Ov 0 0 0 z LEAVE IT HERE George tells tune RC receiverthis isthewaytodoaniF can As example Bob Aberle Tom Hunt went out other day run another test Bob 72400 0/W Tom RC54 72870 plane RC4O 72590 stood bunch transmitters ON antennas extended plane showed us interference sent Bob out 15 ft side Tom out 15 ft opposite direction interference went away fired up engine took off flew around over headsup high down lowand landed gn trouble changed system RC56 repeated test Again no prob lems Thats typical test its result channels just use head Keep little distance between transmitters 20 ft .% sosticktotheAMARCFrequencyControl Plan keep receivers tune dont taxi QV THING FROM 72MHZ TO 73 MHZ 0SIGNALS SUMSMODULATEDSERIAL MOSTLY VHFAND DIFFRENCE455 MHZCONTROL -FREQUENCIESIFONLYPULSES ORIY SIGNALSTUNED RFMIXERAMPUFIEROETECTORDEMODULATOR OThER RCANTENNASECTION MS AI4D tAILIAI RAD DIFFERENSCONTROL PULSES TO INDIVIDUAL c0 q CALSERVOS OSCILLATORONE VERY PRECISE FREQUENCY block diagram depictS whats going RC receiver Theres lots additional explanation column 38 Model Aviation istho wasi pit area little monitoring testing necessary youll make out fine typical IF can transformer sifting metric scale Its cm George didnt notice slugs screw slot still filled beeswax until enlarged photo tuning screw slug visible through hole top can FREQLINCIES NOW AVAILABLE Academy Model Aeronautics pleased nounce sev eral years coor dination activities S Sbetween its RC Frequency Com mittee VHF/UHF Advisory Committee American Radio Relay League ARRL have re suIted agreement new set RC frequencies set aside RC oper ations amateur six-meter band new frequencies immediately available use RCers hold valid FCC Amateur Radio License Technician Class higher Specifically 200 kHz sub-band ex tending 50800 MHz 51000 MHz has designated RC use new ARRL Six-Meter Band Plan just ap proved ARRL Board Directors RC sub-band has further sub divided 10 RC channels Nos 00 09 using 20 kHz spacing between channels Note 20 kHz channel spacing identical spacing new 72 MHz frequencies cause BC equipment yet generally available will safely operate such closely-spaced adjacent channels AMA Six-Meter Phase-In Plan similar 72 MHz Phase-In Plan will effect next eight years plan see box calls use five even-numbered channels during phase-in period thus providing 40 kHz channel separation during timea separation clearly within capabilities equipment currently available amateur-licensed RCers long accustomed operating 53 MHz frequencies AMA hastens re assure continued use frequencies remains perfectly legal frequencies will continue accepted entry AMAsanctioned events However sixmeter RCers should understand background original AMA uni lateral adoption 53 MHz frequen cies RC use developments since time amateur commu nications world have begun cause increasing problems frequencies certain parts countryproblems will lieve inevitably lead gradual shift new frequencies six-meter RC fliers over next five eight years AMA firmly believes mutual recognition new 50800-51000 MHz RC sub-band both AMA ARRL marks major step forward six-meter affairs pro viding what promises relatively interference-free home six-meter fliers indefinite future AMA extend appreciation counterparts ARRL fine spirit cooperation assistance bringing action successful con clusion As usual matters sort much detailed time-consuming effort required part AMA RC Frequency Committee members primarily involved coordi nation activities ARRL Special credit goes former committee member Dick Jansson WD4FAB served principal coordinator former committee chairman Bob Aberle W2QPP played key role orga nizing effort AMAs licensed amateur RC fliers action another example ongoing efforts organization lead way improving aspects mutual hobby AMA also lieves action will benefit RC dustry urges equipment manufac turers seriously consider offering newest lines equipment new 50 MHz Phase-In channels numbers subtract rest 72400 72870 must get 470 first figure attempt make mixing product receiver 455 aware fact electrical signal IF amplifier broad enough 470 can world presented antenna get through cause interference receiver has seek out respond other hand IF properly tuned will transmitters weak little signal reject interference thats exactly consider TV signal goes out what happened Another bugaboo put thousands watts RC trans MHZ BLACK____ WHITE YELLOW*\FREQUENCY RESULT HZ 1/2nd-ORDERIM ISE TUNING two ways tune typical RC receiver right way L stagger tUned RI will allow certain types interference get system Follow Georges procedure tuning receiver avoid stagger tuning though receiver will still work mitter puts out about /2 watt see what job receiver antenna cut specific length usually meter Thus responds best VHF signals length antenna therefore performs first bit filtering tuned RF section fed mostly VHF signals antenna As conse quence way tuned TRF seeContinued page 145 / //4 /$d\\ STAGGER TUNING August 1983 39 AMA painted flat Pactra Formula U covered fuselage silk gets around compound curves easily weight adds negligible fuse lage given four coats nitrate dope final finish light coat Formula U olive drab followed light coat camouflage flat tan Before painting wiped MonoKote areas acetone remove oil dirt Decals produced Dave Platt Models very close proper size model Control rods used Suliivan Gold-NRod cable type lightweight flexible can easily positioned through fuselage bulkheads cable system moving elevator rudder makes very neat installa tion like attach cable servo arms either Du-Bro Gold berg easy connectors rig con trols setup need loosen screw connector move cable fore aft get desired result Flying Did get everything lined-up properly wing tips have cor rect amount washout Are control attachment points secure Are wheels tight Dont laugh Ive seen new ship leave wheel roll ing down runway lifted off cause pre-flight check overlooked takes small item destroy three four months work Check balance point should fall between 25% 30% wing chord Dont fly ship tail-heavy rearward balance point courting snap-roll disaster sure CC correct point model tested 13-in-dia 8-in-pitch prop did very well once trimmed out Later tried 12-8 13-incher seemed put out much thrust 530 sq wing area model handles 4-lb total weight ease During test flights motor battery closely watched bit concerned might heat up too much seems stay very cooL believe Hurricane would really perform new Cobalt motors Maybe Ill try later now Im having ball straight Astro 15 gear unit dont think will have regrets build ship took Hurri cane Valley Flyers Contest California stole show youre looking fun Scale project has great looks flyabiity SAFE FLYING IS NO ACCIDENT ************* *** ** WW***W * * * * WANDITTM * *Dealers Invited * * COn yOar warranty * ~J -K *CORD *Wet DryK * Stich AbrasivesK K *A Keen Machine' gives enceptionalK *sanding control encellent finish* * * 8995 Basic OcI 1 flat Wand 1 * ritsK *10895 Builder Special mcI 2 fIat 1 half * ano wand 5 6 grtsK *12995 Delver includes 3 flar 2 halfK * nd wauds buff wanos andK -K * 6 grits * *Addtional Wands Abrasves ava ableK * e local hobby shopK *K *80015 ELMORE Eoe No 1214 288 5780K * P 0 Box 266 uite Texas 75149K K KKKKKKKKKK*K Radio Technique/Myers Continued page 39 tion selectively amplifies signals between 72 73 MHz rest gives us second stage filtering Meanwhile crystal-controlled oscillator LO receiver running fre quency precisely 455 MHz above transmitters frequency oscil lators voltage frequency injected mixer along amplified RE voltages IRE section mixer frequency present mixed other frequency present including local oscillator mixing new fre Continued page 148 August 1983 145 INTRODUCING THE NEW FOX 36 RC Schneurle Ported Ball Bearing Main BRAND NEW 36 RC.evolved highly successful Combat Special took highly successful Fox Combat Special fitted new MarkXtype carburetor made porting head modifications get run idle well no-nitro fuel Result.the powerful 36 RC market new Fox 36 RC combines power superb idling characteristics light weight.and delivers lowest cost fuels 23900 Fox 36 RO$5995 90236 TiltUp Muffler1495 90237 Tilt-Down Muffler1495 F 0 X MANUFACTURING Co 5305 TDWSON AVEFORT SMITH ARK 72901 Hot Line SOif 686-1656 IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CID QUADRA$10950 Req 22 QUADRA $10450 Brisighelle Flywheel 012450 Req 22 QUADRA POWER ASSEMBLY ONLY 86450 QUADRA REPAIR 1000 pIes pews Jim Mesner ERCOUPEPLANS 82395 KIT $23995 Jim Messe TOMAHAWKPLANS $2395 KIT $25995 Jinx Messe 9-BALL TRAINER PLANS $1695 KIT $9995 BALSA end BASSWOOD fell siesI 35% OFF Connept FLEET PLANS $2995 KIT $15995 COWL $1995 P6W RADIAL ENGINES tar Fleet $2495 VICKERS LEWIS MACHINE GUN KITS $1495 CECONITE Podunts 10% OFF Siq J3 CUB KIT $12495 PLANS SUPER STEARMAN IGedfreyl $2095 STARDUSTER TOO IBrisighellel J3 CUB NeIit $2995 VOLKSPLANE IChinken Cherliel $2395 COCKPIT KITS Tonehewk F4U-1 Spitfire $2295 Ernoepe $2095 Steernien 82295 Citebrie $2495 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Ocedre FUEL TANKSlOne $695 32 en $795 FIBERGLASS ARROW SHAFTS 511$ s 32 long 61$1l1110 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 VelleY View Dr Allegeny NY 14706 AU NEW cusro SCNNEURLE cox 009 ENGINES Racing & Stunt versions special hard chrome & honing technology Also Complete inventory individual stock custom parts Cox TD 020 049 051 & 09 engines Competition parts & accessories Combat Free Fit C/L & A/C Racing Speed Stunt & Team Race Exclusive distributor Nelson 15 engIne & parts detailed catalog send 50 cents Kustom Kraftsmanshlp Box 2699 Laguna Hills CA 92653 Telephone 714 830-5162 Dynathrusts composite construction provides Unequaled Durability Saves money 100% accurate pitch results Outstanding Performance Air Counts s7OO slOO0 $1400 15x 6 18x 6- 8- 10 20x 6-8 10 _____22x 810180O Prices rclsde UPS charges LII MASTER CHARGE []VISA E]COD []CHECK []MONEY ORDER Dealers / Distributors invited THRUST PROPS ING 2541 NE lith Court Pompano Beah FL 33062 1305941 9119 Radio Technique/Myers Contmnoed oae 145 quencieS formed both sums differences originals strength mixing products depends voltages inputs frequen cies presented IF amplifier IF intermediate frequency amplifier very special kind amplifier frequency-sensitive will amplify 455 MHz Everything else rejected IF strip tuned properly Thus IF strip provides third stage filtering Please take word 455 MHz coming out IF strip carries con trol information detector strips formation out 455 MHz blocks 455 MHz voltage traveling fur ther presents control pulses decoder serial form like string box- cars decoder uncouples boxcars sending its proper servo its unique control pulse decoder provides serial-to-parallel sorting function also prunes away whatever trash may have gotten past detector providing final filter brief description should see keeping IF strip tune critically important typical IF strip holds three IF transformers little metal can about x 6 usually fitted screw inside colored black white yellow screw made compressed metal powder should too much tuning will wear edges off threads result screw wont hold adjustment Re-tune receiver necessary tune IF transformer Turn system send out someone transmitter having antenna collapsed have him walk limits control stop await instruction 2 take Ace RC 60K27 tuning wand sharpened hardwood stick rotate tuning screw turn clockwise /2 turn counter clockwise noting positions control lost Leave screw its middle position customary adjust IF transformers order yellow white blackDo three screws 3 Send friend transmitter out limit control again should further outtune again 4 Repeat till youve got maximum range helps friend keeps cycling control sticks back forth know control lost/regained Finish job dripping little melted beeswax screw keep place get beeswax sewing goods store Dritz No 623 peg-board Roll piece strip like matchstick heat sol dering iron drip drip drip e may wonder IF must ad justable precise answer lies fact crystals have real variation absolute frequency law allowed tolerance 0025% works out cycles per second 72960 MHz 835 cycles per second LO WHY SETTLE FOR LESS can have PerformaflCCOflomY 148 Model Aviation Engines Radios Mufflers Custom Carburators Gyros SUPER MINI-BOY VIDEO MINIATURE AIRCRAFT SUPPLY BRINGS YOU ANOTHER HELICOPTER FIRST Professionally produced video takes workshop professionally build set up flight trim mini-boy Includes step step building parts iden tification mechanical operational walk through radio installation balancing bench setup operational flight trimming aerobatics video better having someone else build Mini-Boy Video produced Mike Mas National Helicopter Champion Available ary 1983 BETA VHS WE CAN SUPPLY ALL OF YOUR HELICOPTER NEEDS AT UNBEATABLE PRICESI Worlds Strongest Epoxy Glues Training Stands MIni-Boy Competition Pack Wide-Landing Gear Training Aids Float Kits Video Cassettes Helicopter Tools MOVE UP TO SCNLUTER S See Dealer Call MINIATURE AIRCRAFT SUPPLY 2594 North Orange Blossom Trail ndo FL 32804 e 305 422-1531 crystals frequency 73415 MHz Thus difference between transmitters crystal receivers local oscillator crystal may anything 458659 451341 cps order pick up trans mitters signal IF has adjustable over same range Actually manu facturer will have lot crystals choose have right expect variation crystal will matchcd similar variation other re sult difference will very close nominal 455 MI-lz Ive talking about previous paragraphs same time should see reluctance some people accept idea interchangeable crystals comes might have pair crystals end range break replace another crystal having same nom inal frequency actually other end tolerance band thereby end ing up system out alignment 36% 3659 cycles out bandwidth 10000 reason specifying beeswax stays soft permitting easy removal later Candle wax sealing wax gets harder Youll probably notice other coils transformers PC board usually close August 1983 149 ORDER YOUR VIDEO NOW 5 Plus Shipping Ace AC Silver Seven receiver typical modern RC receiver George has delineated three IF cans us Most RC receivers service have similar appearance though parts may arranged different manner Krafts forthcoming 1991 Receiver shown Weak Signals show Toledo 1983 true 10 kHz narrow-band receiver dual-conversion FM signals present receivers AM block middle marked 7A N crystal filterreplaces 455 MHz IF cans used other receivers adjustable component adjustable IF cans 107 MHz IF stripwhich makes tuning pretty easy Kraft didnt quote price George knows wont cheapyet much new plane worth antenna TRF section rarely need retuning Leave alone waste lot time Some receivers dual-conversion types easily identified presence extra crystal usually 11155 MHz extra IF transformers Tuning done same way before except 107 MHz IF strip first may have trouble identifying IF transformers besides dual-conversion tuning itself pain head Most folks prefer leave professionals have proper equipment make job easier Ive included couple examples will know what am discussing own judge whether want take job Transmitters need occasional tuning dont wont have proper tools control harmonic emissions Besides Federal Law requires transmitter tuning done holders Commercial license Send back manufac turer George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 FF Old-Timers/Haught Continued page 59 problem surfacedthat softening ni trate finishes alcohol-based fuels Early solutions varnish-based hot fuel proofers created weight patch ing problems Butyrate dopes apparent solu tion modelers problems does have major disadvantage never quits shrinkine Eve observed full-size aircraft fu selage stringers flying surface trailing edges hopelessly warped distorted ravages butvrate dope variation known non-tautenine CAB exists readily available through model supply houses now youve probably concluded nitrate dope way go OldTimers powercd ignition engines Now comes question applicationto brush spray Spraying gives smoothest finish brushing good camel-hair brush will give acceptable results Initial coats least two should brushed lncoqporated 322 Sa Gallatin Rd son TN 37115 615 868-6811Mon thru Sat am 500 pm SALES ______________________ RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOS IlI Ill -- insure good bond covering Use brush tissue silkspan silk try new foam brushes flow dope Using brush silk allows dope work through cloth run down back side causing ugly blisters known cure blisters cut out apply patch Thin dope enough work undue brushing thin coats will take seal covering Spraying will re quire thinner coats Separate thinners available nitrate butyrate dope use just thinner both automotive acrylic lacquer thinner Get best three grades available Too much thinning either brush spray appli cations leads runs use sparingly spraying dope too thick finish will have orange peel effect Add thinner and/or hold spray gun far ther surface minimize effect As previously mentioned apply enough dope seal covering airtight fuelproof Build up finish clear dope add pigmented dope color desired Clear dope over colored covering works great lightweight applying color dope over clear sometimes small pin holes show up indicating covering sufficiently sealed Add clear dope try again common dope troubles blushing indicated milky film appearing surface dope dries phenomenon caused rapid evaporation highly-volatile mate rial cooling action will cause moisture condense surface freshly-applied dope resulting milky appearance Blushed dope has no gloss remedy blushing slow drying process addition 5% retarder added thinner used Retarder available automotive paint supply houses will have buy gallon Better try small amount auto body repair shop take own can retarder avail able try postponing doping until less humid day Dopes available retail hobby out lets sometimes nitrate dopes stocked may have ordered Local Fine Quality flying Models 98 RUBBER POWER KITS plus Gliders C/L RIC AccessOriCS Books Catatog 3150 4 8 4 4 * MAJESTIC MODELS 3273 West 129th Street Cleveland Ohio 44111 150 Model Aviation Magic Dragon Trainer Engine Size 25Pre Built Wing Span 55 in$9995 3 4 ChannelsPlus shipping Lives Up Toand handling Its Name__MAGIC! balsa construction Ready fine sand cover Control surfaces hinged HalIco landing gear u nose gear strut Fitted canopy Instruction booklet hardware included Fire Fox Ultimate Sport FlyingPre Built Engine Size 40$12495 Wing Span 52h inPlu shipping handling 4 Channels balsa construction Ready fine sand cover Control surfaces hinged Has bolton wire HalIco landing gear wheel pants mounted axels installed Fitted canopy Instruction booklet hardware included Designers Builders Fine PRE-BUIL T R/C Models Order Today Send check MO also accept Master Card VisaModels shipped 350 PSI carton via UPS Shipping handling $850 Fl residents add 5% sales tax AEROTECH R/C 3850 US Hwy 19 No. Palm Harbor FL 33563 81319383266 have SIX other models available Send Now free brochure Dealer Inquiries Invited REPAIR SERVICE FOR HOBBY LOBBY EK LOGICTROL FUTABA T HOBBY SNACK rROYAL LINE ATTENTION QUARTER & GIANT SCALE MQDELERS LLITSAP need iti LLIT-SAP multiple servo LONG LEAD INTERFERENCE TRAP & SERVO ALTERNATE POWER adap tor Specify radio ordering $2995 postage paid send large SSAE for literature
Edition: Model Aviation - 1983/08
Page Numbers: 38, 39, 145, 148, 149, 150
a loec ni ue George M Myers TUNING YOUR RECEIVER often receive another pound newsletters AMA HQ Based what read some folks overreacting possible RC interference good aware what may happen think wrong tell ourselves will always happen thereby start limiting ourselves un necessarily point fact have flying new RC channels past six months have deliberately invited kind potential interference Ive seen discussed So far using radios built 1970 1976 1978 1980 1982 setting up adjacent-channel 40 KHz interference second-order third-order intermodulation image main thing Ive discovered isnt problem test results mean anything say old radios will work fine new RC Problem AdjacentChannel Interference 2nd Order Intermodula tion 3rd Order Intermodula tion Image 7304o 730464 730454 7287 4 7287 7259 7 73045 7259 7240 CoNTRoL Ov 0 0 0 z LEAVE IT HERE George tells tune RC receiverthis isthewaytodoaniF can As example Bob Aberle Tom Hunt went out other day run another test Bob 72400 0/W Tom RC54 72870 plane RC4O 72590 stood bunch transmitters ON antennas extended plane showed us interference sent Bob out 15 ft side Tom out 15 ft opposite direction interference went away fired up engine took off flew around over headsup high down lowand landed gn trouble changed system RC56 repeated test Again no prob lems Thats typical test its result channels just use head Keep little distance between transmitters 20 ft .% sosticktotheAMARCFrequencyControl Plan keep receivers tune dont taxi QV THING FROM 72MHZ TO 73 MHZ 0SIGNALS SUMSMODULATEDSERIAL MOSTLY VHFAND DIFFRENCE455 MHZCONTROL -FREQUENCIESIFONLYPULSES ORIY SIGNALSTUNED RFMIXERAMPUFIEROETECTORDEMODULATOR OThER RCANTENNASECTION MS AI4D tAILIAI RAD DIFFERENSCONTROL PULSES TO INDIVIDUAL c0 q CALSERVOS OSCILLATORONE VERY PRECISE FREQUENCY block diagram depictS whats going RC receiver Theres lots additional explanation column 38 Model Aviation istho wasi pit area little monitoring testing necessary youll make out fine typical IF can transformer sifting metric scale Its cm George didnt notice slugs screw slot still filled beeswax until enlarged photo tuning screw slug visible through hole top can FREQLINCIES NOW AVAILABLE Academy Model Aeronautics pleased nounce sev eral years coor dination activities S Sbetween its RC Frequency Com mittee VHF/UHF Advisory Committee American Radio Relay League ARRL have re suIted agreement new set RC frequencies set aside RC oper ations amateur six-meter band new frequencies immediately available use RCers hold valid FCC Amateur Radio License Technician Class higher Specifically 200 kHz sub-band ex tending 50800 MHz 51000 MHz has designated RC use new ARRL Six-Meter Band Plan just ap proved ARRL Board Directors RC sub-band has further sub divided 10 RC channels Nos 00 09 using 20 kHz spacing between channels Note 20 kHz channel spacing identical spacing new 72 MHz frequencies cause BC equipment yet generally available will safely operate such closely-spaced adjacent channels AMA Six-Meter Phase-In Plan similar 72 MHz Phase-In Plan will effect next eight years plan see box calls use five even-numbered channels during phase-in period thus providing 40 kHz channel separation during timea separation clearly within capabilities equipment currently available amateur-licensed RCers long accustomed operating 53 MHz frequencies AMA hastens re assure continued use frequencies remains perfectly legal frequencies will continue accepted entry AMAsanctioned events However sixmeter RCers should understand background original AMA uni lateral adoption 53 MHz frequen cies RC use developments since time amateur commu nications world have begun cause increasing problems frequencies certain parts countryproblems will lieve inevitably lead gradual shift new frequencies six-meter RC fliers over next five eight years AMA firmly believes mutual recognition new 50800-51000 MHz RC sub-band both AMA ARRL marks major step forward six-meter affairs pro viding what promises relatively interference-free home six-meter fliers indefinite future AMA extend appreciation counterparts ARRL fine spirit cooperation assistance bringing action successful con clusion As usual matters sort much detailed time-consuming effort required part AMA RC Frequency Committee members primarily involved coordi nation activities ARRL Special credit goes former committee member Dick Jansson WD4FAB served principal coordinator former committee chairman Bob Aberle W2QPP played key role orga nizing effort AMAs licensed amateur RC fliers action another example ongoing efforts organization lead way improving aspects mutual hobby AMA also lieves action will benefit RC dustry urges equipment manufac turers seriously consider offering newest lines equipment new 50 MHz Phase-In channels numbers subtract rest 72400 72870 must get 470 first figure attempt make mixing product receiver 455 aware fact electrical signal IF amplifier broad enough 470 can world presented antenna get through cause interference receiver has seek out respond other hand IF properly tuned will transmitters weak little signal reject interference thats exactly consider TV signal goes out what happened Another bugaboo put thousands watts RC trans MHZ BLACK____ WHITE YELLOW*\FREQUENCY RESULT HZ 1/2nd-ORDERIM ISE TUNING two ways tune typical RC receiver right way L stagger tUned RI will allow certain types interference get system Follow Georges procedure tuning receiver avoid stagger tuning though receiver will still work mitter puts out about /2 watt see what job receiver antenna cut specific length usually meter Thus responds best VHF signals length antenna therefore performs first bit filtering tuned RF section fed mostly VHF signals antenna As conse quence way tuned TRF seeContinued page 145 / //4 /$d\\ STAGGER TUNING August 1983 39 AMA painted flat Pactra Formula U covered fuselage silk gets around compound curves easily weight adds negligible fuse lage given four coats nitrate dope final finish light coat Formula U olive drab followed light coat camouflage flat tan Before painting wiped MonoKote areas acetone remove oil dirt Decals produced Dave Platt Models very close proper size model Control rods used Suliivan Gold-NRod cable type lightweight flexible can easily positioned through fuselage bulkheads cable system moving elevator rudder makes very neat installa tion like attach cable servo arms either Du-Bro Gold berg easy connectors rig con trols setup need loosen screw connector move cable fore aft get desired result Flying Did get everything lined-up properly wing tips have cor rect amount washout Are control attachment points secure Are wheels tight Dont laugh Ive seen new ship leave wheel roll ing down runway lifted off cause pre-flight check overlooked takes small item destroy three four months work Check balance point should fall between 25% 30% wing chord Dont fly ship tail-heavy rearward balance point courting snap-roll disaster sure CC correct point model tested 13-in-dia 8-in-pitch prop did very well once trimmed out Later tried 12-8 13-incher seemed put out much thrust 530 sq wing area model handles 4-lb total weight ease During test flights motor battery closely watched bit concerned might heat up too much seems stay very cooL believe Hurricane would really perform new Cobalt motors Maybe Ill try later now Im having ball straight Astro 15 gear unit dont think will have regrets build ship took Hurri cane Valley Flyers Contest California stole show youre looking fun Scale project has great looks flyabiity SAFE FLYING IS NO ACCIDENT ************* *** ** WW***W * * * * WANDITTM * *Dealers Invited * * COn yOar warranty * ~J -K *CORD *Wet DryK * Stich AbrasivesK K *A Keen Machine' gives enceptionalK *sanding control encellent finish* * * 8995 Basic OcI 1 flat Wand 1 * ritsK *10895 Builder Special mcI 2 fIat 1 half * ano wand 5 6 grtsK *12995 Delver includes 3 flar 2 halfK * nd wauds buff wanos andK -K * 6 grits * *Addtional Wands Abrasves ava ableK * e local hobby shopK *K *80015 ELMORE Eoe No 1214 288 5780K * P 0 Box 266 uite Texas 75149K K KKKKKKKKKK*K Radio Technique/Myers Continued page 39 tion selectively amplifies signals between 72 73 MHz rest gives us second stage filtering Meanwhile crystal-controlled oscillator LO receiver running fre quency precisely 455 MHz above transmitters frequency oscil lators voltage frequency injected mixer along amplified RE voltages IRE section mixer frequency present mixed other frequency present including local oscillator mixing new fre Continued page 148 August 1983 145 INTRODUCING THE NEW FOX 36 RC Schneurle Ported Ball Bearing Main BRAND NEW 36 RC.evolved highly successful Combat Special took highly successful Fox Combat Special fitted new MarkXtype carburetor made porting head modifications get run idle well no-nitro fuel Result.the powerful 36 RC market new Fox 36 RC combines power superb idling characteristics light weight.and delivers lowest cost fuels 23900 Fox 36 RO$5995 90236 TiltUp Muffler1495 90237 Tilt-Down Muffler1495 F 0 X MANUFACTURING Co 5305 TDWSON AVEFORT SMITH ARK 72901 Hot Line SOif 686-1656 IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CID QUADRA$10950 Req 22 QUADRA $10450 Brisighelle Flywheel 012450 Req 22 QUADRA POWER ASSEMBLY ONLY 86450 QUADRA REPAIR 1000 pIes pews Jim Mesner ERCOUPEPLANS 82395 KIT $23995 Jim Messe TOMAHAWKPLANS $2395 KIT $25995 Jinx Messe 9-BALL TRAINER PLANS $1695 KIT $9995 BALSA end BASSWOOD fell siesI 35% OFF Connept FLEET PLANS $2995 KIT $15995 COWL $1995 P6W RADIAL ENGINES tar Fleet $2495 VICKERS LEWIS MACHINE GUN KITS $1495 CECONITE Podunts 10% OFF Siq J3 CUB KIT $12495 PLANS SUPER STEARMAN IGedfreyl $2095 STARDUSTER TOO IBrisighellel J3 CUB NeIit $2995 VOLKSPLANE IChinken Cherliel $2395 COCKPIT KITS Tonehewk F4U-1 Spitfire $2295 Ernoepe $2095 Steernien 82295 Citebrie $2495 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Ocedre FUEL TANKSlOne $695 32 en $795 FIBERGLASS ARROW SHAFTS 511$ s 32 long 61$1l1110 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 VelleY View Dr Allegeny NY 14706 AU NEW cusro SCNNEURLE cox 009 ENGINES Racing & Stunt versions special hard chrome & honing technology Also Complete inventory individual stock custom parts Cox TD 020 049 051 & 09 engines Competition parts & accessories Combat Free Fit C/L & A/C Racing Speed Stunt & Team Race Exclusive distributor Nelson 15 engIne & parts detailed catalog send 50 cents Kustom Kraftsmanshlp Box 2699 Laguna Hills CA 92653 Telephone 714 830-5162 Dynathrusts composite construction provides Unequaled Durability Saves money 100% accurate pitch results Outstanding Performance Air Counts s7OO slOO0 $1400 15x 6 18x 6- 8- 10 20x 6-8 10 _____22x 810180O Prices rclsde UPS charges LII MASTER CHARGE []VISA E]COD []CHECK []MONEY ORDER Dealers / Distributors invited THRUST PROPS ING 2541 NE lith Court Pompano Beah FL 33062 1305941 9119 Radio Technique/Myers Contmnoed oae 145 quencieS formed both sums differences originals strength mixing products depends voltages inputs frequen cies presented IF amplifier IF intermediate frequency amplifier very special kind amplifier frequency-sensitive will amplify 455 MHz Everything else rejected IF strip tuned properly Thus IF strip provides third stage filtering Please take word 455 MHz coming out IF strip carries con trol information detector strips formation out 455 MHz blocks 455 MHz voltage traveling fur ther presents control pulses decoder serial form like string box- cars decoder uncouples boxcars sending its proper servo its unique control pulse decoder provides serial-to-parallel sorting function also prunes away whatever trash may have gotten past detector providing final filter brief description should see keeping IF strip tune critically important typical IF strip holds three IF transformers little metal can about x 6 usually fitted screw inside colored black white yellow screw made compressed metal powder should too much tuning will wear edges off threads result screw wont hold adjustment Re-tune receiver necessary tune IF transformer Turn system send out someone transmitter having antenna collapsed have him walk limits control stop await instruction 2 take Ace RC 60K27 tuning wand sharpened hardwood stick rotate tuning screw turn clockwise /2 turn counter clockwise noting positions control lost Leave screw its middle position customary adjust IF transformers order yellow white blackDo three screws 3 Send friend transmitter out limit control again should further outtune again 4 Repeat till youve got maximum range helps friend keeps cycling control sticks back forth know control lost/regained Finish job dripping little melted beeswax screw keep place get beeswax sewing goods store Dritz No 623 peg-board Roll piece strip like matchstick heat sol dering iron drip drip drip e may wonder IF must ad justable precise answer lies fact crystals have real variation absolute frequency law allowed tolerance 0025% works out cycles per second 72960 MHz 835 cycles per second LO WHY SETTLE FOR LESS can have PerformaflCCOflomY 148 Model Aviation Engines Radios Mufflers Custom Carburators Gyros SUPER MINI-BOY VIDEO MINIATURE AIRCRAFT SUPPLY BRINGS YOU ANOTHER HELICOPTER FIRST Professionally produced video takes workshop professionally build set up flight trim mini-boy Includes step step building parts iden tification mechanical operational walk through radio installation balancing bench setup operational flight trimming aerobatics video better having someone else build Mini-Boy Video produced Mike Mas National Helicopter Champion Available ary 1983 BETA VHS WE CAN SUPPLY ALL OF YOUR HELICOPTER NEEDS AT UNBEATABLE PRICESI Worlds Strongest Epoxy Glues Training Stands MIni-Boy Competition Pack Wide-Landing Gear Training Aids Float Kits Video Cassettes Helicopter Tools MOVE UP TO SCNLUTER S See Dealer Call MINIATURE AIRCRAFT SUPPLY 2594 North Orange Blossom Trail ndo FL 32804 e 305 422-1531 crystals frequency 73415 MHz Thus difference between transmitters crystal receivers local oscillator crystal may anything 458659 451341 cps order pick up trans mitters signal IF has adjustable over same range Actually manu facturer will have lot crystals choose have right expect variation crystal will matchcd similar variation other re sult difference will very close nominal 455 MI-lz Ive talking about previous paragraphs same time should see reluctance some people accept idea interchangeable crystals comes might have pair crystals end range break replace another crystal having same nom inal frequency actually other end tolerance band thereby end ing up system out alignment 36% 3659 cycles out bandwidth 10000 reason specifying beeswax stays soft permitting easy removal later Candle wax sealing wax gets harder Youll probably notice other coils transformers PC board usually close August 1983 149 ORDER YOUR VIDEO NOW 5 Plus Shipping Ace AC Silver Seven receiver typical modern RC receiver George has delineated three IF cans us Most RC receivers service have similar appearance though parts may arranged different manner Krafts forthcoming 1991 Receiver shown Weak Signals show Toledo 1983 true 10 kHz narrow-band receiver dual-conversion FM signals present receivers AM block middle marked 7A N crystal filterreplaces 455 MHz IF cans used other receivers adjustable component adjustable IF cans 107 MHz IF stripwhich makes tuning pretty easy Kraft didnt quote price George knows wont cheapyet much new plane worth antenna TRF section rarely need retuning Leave alone waste lot time Some receivers dual-conversion types easily identified presence extra crystal usually 11155 MHz extra IF transformers Tuning done same way before except 107 MHz IF strip first may have trouble identifying IF transformers besides dual-conversion tuning itself pain head Most folks prefer leave professionals have proper equipment make job easier Ive included couple examples will know what am discussing own judge whether want take job Transmitters need occasional tuning dont wont have proper tools control harmonic emissions Besides Federal Law requires transmitter tuning done holders Commercial license Send back manufac turer George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 FF Old-Timers/Haught Continued page 59 problem surfacedthat softening ni trate finishes alcohol-based fuels Early solutions varnish-based hot fuel proofers created weight patch ing problems Butyrate dopes apparent solu tion modelers problems does have major disadvantage never quits shrinkine Eve observed full-size aircraft fu selage stringers flying surface trailing edges hopelessly warped distorted ravages butvrate dope variation known non-tautenine CAB exists readily available through model supply houses now youve probably concluded nitrate dope way go OldTimers powercd ignition engines Now comes question applicationto brush spray Spraying gives smoothest finish brushing good camel-hair brush will give acceptable results Initial coats least two should brushed lncoqporated 322 Sa Gallatin Rd son TN 37115 615 868-6811Mon thru Sat am 500 pm SALES ______________________ RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOS IlI Ill -- insure good bond covering Use brush tissue silkspan silk try new foam brushes flow dope Using brush silk allows dope work through cloth run down back side causing ugly blisters known cure blisters cut out apply patch Thin dope enough work undue brushing thin coats will take seal covering Spraying will re quire thinner coats Separate thinners available nitrate butyrate dope use just thinner both automotive acrylic lacquer thinner Get best three grades available Too much thinning either brush spray appli cations leads runs use sparingly spraying dope too thick finish will have orange peel effect Add thinner and/or hold spray gun far ther surface minimize effect As previously mentioned apply enough dope seal covering airtight fuelproof Build up finish clear dope add pigmented dope color desired Clear dope over colored covering works great lightweight applying color dope over clear sometimes small pin holes show up indicating covering sufficiently sealed Add clear dope try again common dope troubles blushing indicated milky film appearing surface dope dries phenomenon caused rapid evaporation highly-volatile mate rial cooling action will cause moisture condense surface freshly-applied dope resulting milky appearance Blushed dope has no gloss remedy blushing slow drying process addition 5% retarder added thinner used Retarder available automotive paint supply houses will have buy gallon Better try small amount auto body repair shop take own can retarder avail able try postponing doping until less humid day Dopes available retail hobby out lets sometimes nitrate dopes stocked may have ordered Local Fine Quality flying Models 98 RUBBER POWER KITS plus Gliders C/L RIC AccessOriCS Books Catatog 3150 4 8 4 4 * MAJESTIC MODELS 3273 West 129th Street Cleveland Ohio 44111 150 Model Aviation Magic Dragon Trainer Engine Size 25Pre Built Wing Span 55 in$9995 3 4 ChannelsPlus shipping Lives Up Toand handling Its Name__MAGIC! balsa construction Ready fine sand cover Control surfaces hinged HalIco landing gear u nose gear strut Fitted canopy Instruction booklet hardware included Fire Fox Ultimate Sport FlyingPre Built Engine Size 40$12495 Wing Span 52h inPlu shipping handling 4 Channels balsa construction Ready fine sand cover Control surfaces hinged Has bolton wire HalIco landing gear wheel pants mounted axels installed Fitted canopy Instruction booklet hardware included Designers Builders Fine PRE-BUIL T R/C Models Order Today Send check MO also accept Master Card VisaModels shipped 350 PSI carton via UPS Shipping handling $850 Fl residents add 5% sales tax AEROTECH R/C 3850 US Hwy 19 No. Palm Harbor FL 33563 81319383266 have SIX other models available Send Now free brochure Dealer Inquiries Invited REPAIR SERVICE FOR HOBBY LOBBY EK LOGICTROL FUTABA T HOBBY SNACK rROYAL LINE ATTENTION QUARTER & GIANT SCALE MQDELERS LLITSAP need iti LLIT-SAP multiple servo LONG LEAD INTERFERENCE TRAP & SERVO ALTERNATE POWER adap tor Specify radio ordering $2995 postage paid send large SSAE for literature
Edition: Model Aviation - 1983/08
Page Numbers: 38, 39, 145, 148, 149, 150
a loec ni ue George M Myers TUNING YOUR RECEIVER often receive another pound newsletters AMA HQ Based what read some folks overreacting possible RC interference good aware what may happen think wrong tell ourselves will always happen thereby start limiting ourselves un necessarily point fact have flying new RC channels past six months have deliberately invited kind potential interference Ive seen discussed So far using radios built 1970 1976 1978 1980 1982 setting up adjacent-channel 40 KHz interference second-order third-order intermodulation image main thing Ive discovered isnt problem test results mean anything say old radios will work fine new RC Problem AdjacentChannel Interference 2nd Order Intermodula tion 3rd Order Intermodula tion Image 7304o 730464 730454 7287 4 7287 7259 7 73045 7259 7240 CoNTRoL Ov 0 0 0 z LEAVE IT HERE George tells tune RC receiverthis isthewaytodoaniF can As example Bob Aberle Tom Hunt went out other day run another test Bob 72400 0/W Tom RC54 72870 plane RC4O 72590 stood bunch transmitters ON antennas extended plane showed us interference sent Bob out 15 ft side Tom out 15 ft opposite direction interference went away fired up engine took off flew around over headsup high down lowand landed gn trouble changed system RC56 repeated test Again no prob lems Thats typical test its result channels just use head Keep little distance between transmitters 20 ft .% sosticktotheAMARCFrequencyControl Plan keep receivers tune dont taxi QV THING FROM 72MHZ TO 73 MHZ 0SIGNALS SUMSMODULATEDSERIAL MOSTLY VHFAND DIFFRENCE455 MHZCONTROL -FREQUENCIESIFONLYPULSES ORIY SIGNALSTUNED RFMIXERAMPUFIEROETECTORDEMODULATOR OThER RCANTENNASECTION MS AI4D tAILIAI RAD DIFFERENSCONTROL PULSES TO INDIVIDUAL c0 q CALSERVOS OSCILLATORONE VERY PRECISE FREQUENCY block diagram depictS whats going RC receiver Theres lots additional explanation column 38 Model Aviation istho wasi pit area little monitoring testing necessary youll make out fine typical IF can transformer sifting metric scale Its cm George didnt notice slugs screw slot still filled beeswax until enlarged photo tuning screw slug visible through hole top can FREQLINCIES NOW AVAILABLE Academy Model Aeronautics pleased nounce sev eral years coor dination activities S Sbetween its RC Frequency Com mittee VHF/UHF Advisory Committee American Radio Relay League ARRL have re suIted agreement new set RC frequencies set aside RC oper ations amateur six-meter band new frequencies immediately available use RCers hold valid FCC Amateur Radio License Technician Class higher Specifically 200 kHz sub-band ex tending 50800 MHz 51000 MHz has designated RC use new ARRL Six-Meter Band Plan just ap proved ARRL Board Directors RC sub-band has further sub divided 10 RC channels Nos 00 09 using 20 kHz spacing between channels Note 20 kHz channel spacing identical spacing new 72 MHz frequencies cause BC equipment yet generally available will safely operate such closely-spaced adjacent channels AMA Six-Meter Phase-In Plan similar 72 MHz Phase-In Plan will effect next eight years plan see box calls use five even-numbered channels during phase-in period thus providing 40 kHz channel separation during timea separation clearly within capabilities equipment currently available amateur-licensed RCers long accustomed operating 53 MHz frequencies AMA hastens re assure continued use frequencies remains perfectly legal frequencies will continue accepted entry AMAsanctioned events However sixmeter RCers should understand background original AMA uni lateral adoption 53 MHz frequen cies RC use developments since time amateur commu nications world have begun cause increasing problems frequencies certain parts countryproblems will lieve inevitably lead gradual shift new frequencies six-meter RC fliers over next five eight years AMA firmly believes mutual recognition new 50800-51000 MHz RC sub-band both AMA ARRL marks major step forward six-meter affairs pro viding what promises relatively interference-free home six-meter fliers indefinite future AMA extend appreciation counterparts ARRL fine spirit cooperation assistance bringing action successful con clusion As usual matters sort much detailed time-consuming effort required part AMA RC Frequency Committee members primarily involved coordi nation activities ARRL Special credit goes former committee member Dick Jansson WD4FAB served principal coordinator former committee chairman Bob Aberle W2QPP played key role orga nizing effort AMAs licensed amateur RC fliers action another example ongoing efforts organization lead way improving aspects mutual hobby AMA also lieves action will benefit RC dustry urges equipment manufac turers seriously consider offering newest lines equipment new 50 MHz Phase-In channels numbers subtract rest 72400 72870 must get 470 first figure attempt make mixing product receiver 455 aware fact electrical signal IF amplifier broad enough 470 can world presented antenna get through cause interference receiver has seek out respond other hand IF properly tuned will transmitters weak little signal reject interference thats exactly consider TV signal goes out what happened Another bugaboo put thousands watts RC trans MHZ BLACK____ WHITE YELLOW*\FREQUENCY RESULT HZ 1/2nd-ORDERIM ISE TUNING two ways tune typical RC receiver right way L stagger tUned RI will allow certain types interference get system Follow Georges procedure tuning receiver avoid stagger tuning though receiver will still work mitter puts out about /2 watt see what job receiver antenna cut specific length usually meter Thus responds best VHF signals length antenna therefore performs first bit filtering tuned RF section fed mostly VHF signals antenna As conse quence way tuned TRF seeContinued page 145 / //4 /$d\\ STAGGER TUNING August 1983 39 AMA painted flat Pactra Formula U covered fuselage silk gets around compound curves easily weight adds negligible fuse lage given four coats nitrate dope final finish light coat Formula U olive drab followed light coat camouflage flat tan Before painting wiped MonoKote areas acetone remove oil dirt Decals produced Dave Platt Models very close proper size model Control rods used Suliivan Gold-NRod cable type lightweight flexible can easily positioned through fuselage bulkheads cable system moving elevator rudder makes very neat installa tion like attach cable servo arms either Du-Bro Gold berg easy connectors rig con trols setup need loosen screw connector move cable fore aft get desired result Flying Did get everything lined-up properly wing tips have cor rect amount washout Are control attachment points secure Are wheels tight Dont laugh Ive seen new ship leave wheel roll ing down runway lifted off cause pre-flight check overlooked takes small item destroy three four months work Check balance point should fall between 25% 30% wing chord Dont fly ship tail-heavy rearward balance point courting snap-roll disaster sure CC correct point model tested 13-in-dia 8-in-pitch prop did very well once trimmed out Later tried 12-8 13-incher seemed put out much thrust 530 sq wing area model handles 4-lb total weight ease During test flights motor battery closely watched bit concerned might heat up too much seems stay very cooL believe Hurricane would really perform new Cobalt motors Maybe Ill try later now Im having ball straight Astro 15 gear unit dont think will have regrets build ship took Hurri cane Valley Flyers Contest California stole show youre looking fun Scale project has great looks flyabiity SAFE FLYING IS NO ACCIDENT ************* *** ** WW***W * * * * WANDITTM * *Dealers Invited * * COn yOar warranty * ~J -K *CORD *Wet DryK * Stich AbrasivesK K *A Keen Machine' gives enceptionalK *sanding control encellent finish* * * 8995 Basic OcI 1 flat Wand 1 * ritsK *10895 Builder Special mcI 2 fIat 1 half * ano wand 5 6 grtsK *12995 Delver includes 3 flar 2 halfK * nd wauds buff wanos andK -K * 6 grits * *Addtional Wands Abrasves ava ableK * e local hobby shopK *K *80015 ELMORE Eoe No 1214 288 5780K * P 0 Box 266 uite Texas 75149K K KKKKKKKKKK*K Radio Technique/Myers Continued page 39 tion selectively amplifies signals between 72 73 MHz rest gives us second stage filtering Meanwhile crystal-controlled oscillator LO receiver running fre quency precisely 455 MHz above transmitters frequency oscil lators voltage frequency injected mixer along amplified RE voltages IRE section mixer frequency present mixed other frequency present including local oscillator mixing new fre Continued page 148 August 1983 145 INTRODUCING THE NEW FOX 36 RC Schneurle Ported Ball Bearing Main BRAND NEW 36 RC.evolved highly successful Combat Special took highly successful Fox Combat Special fitted new MarkXtype carburetor made porting head modifications get run idle well no-nitro fuel Result.the powerful 36 RC market new Fox 36 RC combines power superb idling characteristics light weight.and delivers lowest cost fuels 23900 Fox 36 RO$5995 90236 TiltUp Muffler1495 90237 Tilt-Down Muffler1495 F 0 X MANUFACTURING Co 5305 TDWSON AVEFORT SMITH ARK 72901 Hot Line SOif 686-1656 IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CID QUADRA$10950 Req 22 QUADRA $10450 Brisighelle Flywheel 012450 Req 22 QUADRA POWER ASSEMBLY ONLY 86450 QUADRA REPAIR 1000 pIes pews Jim Mesner ERCOUPEPLANS 82395 KIT $23995 Jim Messe TOMAHAWKPLANS $2395 KIT $25995 Jinx Messe 9-BALL TRAINER PLANS $1695 KIT $9995 BALSA end BASSWOOD fell siesI 35% OFF Connept FLEET PLANS $2995 KIT $15995 COWL $1995 P6W RADIAL ENGINES tar Fleet $2495 VICKERS LEWIS MACHINE GUN KITS $1495 CECONITE Podunts 10% OFF Siq J3 CUB KIT $12495 PLANS SUPER STEARMAN IGedfreyl $2095 STARDUSTER TOO IBrisighellel J3 CUB NeIit $2995 VOLKSPLANE IChinken Cherliel $2395 COCKPIT KITS Tonehewk F4U-1 Spitfire $2295 Ernoepe $2095 Steernien 82295 Citebrie $2495 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Ocedre FUEL TANKSlOne $695 32 en $795 FIBERGLASS ARROW SHAFTS 511$ s 32 long 61$1l1110 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 VelleY View Dr Allegeny NY 14706 AU NEW cusro SCNNEURLE cox 009 ENGINES Racing & Stunt versions special hard chrome & honing technology Also Complete inventory individual stock custom parts Cox TD 020 049 051 & 09 engines Competition parts & accessories Combat Free Fit C/L & A/C Racing Speed Stunt & Team Race Exclusive distributor Nelson 15 engIne & parts detailed catalog send 50 cents Kustom Kraftsmanshlp Box 2699 Laguna Hills CA 92653 Telephone 714 830-5162 Dynathrusts composite construction provides Unequaled Durability Saves money 100% accurate pitch results Outstanding Performance Air Counts s7OO slOO0 $1400 15x 6 18x 6- 8- 10 20x 6-8 10 _____22x 810180O Prices rclsde UPS charges LII MASTER CHARGE []VISA E]COD []CHECK []MONEY ORDER Dealers / Distributors invited THRUST PROPS ING 2541 NE lith Court Pompano Beah FL 33062 1305941 9119 Radio Technique/Myers Contmnoed oae 145 quencieS formed both sums differences originals strength mixing products depends voltages inputs frequen cies presented IF amplifier IF intermediate frequency amplifier very special kind amplifier frequency-sensitive will amplify 455 MHz Everything else rejected IF strip tuned properly Thus IF strip provides third stage filtering Please take word 455 MHz coming out IF strip carries con trol information detector strips formation out 455 MHz blocks 455 MHz voltage traveling fur ther presents control pulses decoder serial form like string box- cars decoder uncouples boxcars sending its proper servo its unique control pulse decoder provides serial-to-parallel sorting function also prunes away whatever trash may have gotten past detector providing final filter brief description should see keeping IF strip tune critically important typical IF strip holds three IF transformers little metal can about x 6 usually fitted screw inside colored black white yellow screw made compressed metal powder should too much tuning will wear edges off threads result screw wont hold adjustment Re-tune receiver necessary tune IF transformer Turn system send out someone transmitter having antenna collapsed have him walk limits control stop await instruction 2 take Ace RC 60K27 tuning wand sharpened hardwood stick rotate tuning screw turn clockwise /2 turn counter clockwise noting positions control lost Leave screw its middle position customary adjust IF transformers order yellow white blackDo three screws 3 Send friend transmitter out limit control again should further outtune again 4 Repeat till youve got maximum range helps friend keeps cycling control sticks back forth know control lost/regained Finish job dripping little melted beeswax screw keep place get beeswax sewing goods store Dritz No 623 peg-board Roll piece strip like matchstick heat sol dering iron drip drip drip e may wonder IF must ad justable precise answer lies fact crystals have real variation absolute frequency law allowed tolerance 0025% works out cycles per second 72960 MHz 835 cycles per second LO WHY SETTLE FOR LESS can have PerformaflCCOflomY 148 Model Aviation Engines Radios Mufflers Custom Carburators Gyros SUPER MINI-BOY VIDEO MINIATURE AIRCRAFT SUPPLY BRINGS YOU ANOTHER HELICOPTER FIRST Professionally produced video takes workshop professionally build set up flight trim mini-boy Includes step step building parts iden tification mechanical operational walk through radio installation balancing bench setup operational flight trimming aerobatics video better having someone else build Mini-Boy Video produced Mike Mas National Helicopter Champion Available ary 1983 BETA VHS WE CAN SUPPLY ALL OF YOUR HELICOPTER NEEDS AT UNBEATABLE PRICESI Worlds Strongest Epoxy Glues Training Stands MIni-Boy Competition Pack Wide-Landing Gear Training Aids Float Kits Video Cassettes Helicopter Tools MOVE UP TO SCNLUTER S See Dealer Call MINIATURE AIRCRAFT SUPPLY 2594 North Orange Blossom Trail ndo FL 32804 e 305 422-1531 crystals frequency 73415 MHz Thus difference between transmitters crystal receivers local oscillator crystal may anything 458659 451341 cps order pick up trans mitters signal IF has adjustable over same range Actually manu facturer will have lot crystals choose have right expect variation crystal will matchcd similar variation other re sult difference will very close nominal 455 MI-lz Ive talking about previous paragraphs same time should see reluctance some people accept idea interchangeable crystals comes might have pair crystals end range break replace another crystal having same nom inal frequency actually other end tolerance band thereby end ing up system out alignment 36% 3659 cycles out bandwidth 10000 reason specifying beeswax stays soft permitting easy removal later Candle wax sealing wax gets harder Youll probably notice other coils transformers PC board usually close August 1983 149 ORDER YOUR VIDEO NOW 5 Plus Shipping Ace AC Silver Seven receiver typical modern RC receiver George has delineated three IF cans us Most RC receivers service have similar appearance though parts may arranged different manner Krafts forthcoming 1991 Receiver shown Weak Signals show Toledo 1983 true 10 kHz narrow-band receiver dual-conversion FM signals present receivers AM block middle marked 7A N crystal filterreplaces 455 MHz IF cans used other receivers adjustable component adjustable IF cans 107 MHz IF stripwhich makes tuning pretty easy Kraft didnt quote price George knows wont cheapyet much new plane worth antenna TRF section rarely need retuning Leave alone waste lot time Some receivers dual-conversion types easily identified presence extra crystal usually 11155 MHz extra IF transformers Tuning done same way before except 107 MHz IF strip first may have trouble identifying IF transformers besides dual-conversion tuning itself pain head Most folks prefer leave professionals have proper equipment make job easier Ive included couple examples will know what am discussing own judge whether want take job Transmitters need occasional tuning dont wont have proper tools control harmonic emissions Besides Federal Law requires transmitter tuning done holders Commercial license Send back manufac turer George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 FF Old-Timers/Haught Continued page 59 problem surfacedthat softening ni trate finishes alcohol-based fuels Early solutions varnish-based hot fuel proofers created weight patch ing problems Butyrate dopes apparent solu tion modelers problems does have major disadvantage never quits shrinkine Eve observed full-size aircraft fu selage stringers flying surface trailing edges hopelessly warped distorted ravages butvrate dope variation known non-tautenine CAB exists readily available through model supply houses now youve probably concluded nitrate dope way go OldTimers powercd ignition engines Now comes question applicationto brush spray Spraying gives smoothest finish brushing good camel-hair brush will give acceptable results Initial coats least two should brushed lncoqporated 322 Sa Gallatin Rd son TN 37115 615 868-6811Mon thru Sat am 500 pm SALES ______________________ RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOS IlI Ill -- insure good bond covering Use brush tissue silkspan silk try new foam brushes flow dope Using brush silk allows dope work through cloth run down back side causing ugly blisters known cure blisters cut out apply patch Thin dope enough work undue brushing thin coats will take seal covering Spraying will re quire thinner coats Separate thinners available nitrate butyrate dope use just thinner both automotive acrylic lacquer thinner Get best three grades available Too much thinning either brush spray appli cations leads runs use sparingly spraying dope too thick finish will have orange peel effect Add thinner and/or hold spray gun far ther surface minimize effect As previously mentioned apply enough dope seal covering airtight fuelproof Build up finish clear dope add pigmented dope color desired Clear dope over colored covering works great lightweight applying color dope over clear sometimes small pin holes show up indicating covering sufficiently sealed Add clear dope try again common dope troubles blushing indicated milky film appearing surface dope dries phenomenon caused rapid evaporation highly-volatile mate rial cooling action will cause moisture condense surface freshly-applied dope resulting milky appearance Blushed dope has no gloss remedy blushing slow drying process addition 5% retarder added thinner used Retarder available automotive paint supply houses will have buy gallon Better try small amount auto body repair shop take own can retarder avail able try postponing doping until less humid day Dopes available retail hobby out lets sometimes nitrate dopes stocked may have ordered Local Fine Quality flying Models 98 RUBBER POWER KITS plus Gliders C/L RIC AccessOriCS Books Catatog 3150 4 8 4 4 * MAJESTIC MODELS 3273 West 129th Street Cleveland Ohio 44111 150 Model Aviation Magic Dragon Trainer Engine Size 25Pre Built Wing Span 55 in$9995 3 4 ChannelsPlus shipping Lives Up Toand handling Its Name__MAGIC! balsa construction Ready fine sand cover Control surfaces hinged HalIco landing gear u nose gear strut Fitted canopy Instruction booklet hardware included Fire Fox Ultimate Sport FlyingPre Built Engine Size 40$12495 Wing Span 52h inPlu shipping handling 4 Channels balsa construction Ready fine sand cover Control surfaces hinged Has bolton wire HalIco landing gear wheel pants mounted axels installed Fitted canopy Instruction booklet hardware included Designers Builders Fine PRE-BUIL T R/C Models Order Today Send check MO also accept Master Card VisaModels shipped 350 PSI carton via UPS Shipping handling $850 Fl residents add 5% sales tax AEROTECH R/C 3850 US Hwy 19 No. Palm Harbor FL 33563 81319383266 have SIX other models available Send Now free brochure Dealer Inquiries Invited REPAIR SERVICE FOR HOBBY LOBBY EK LOGICTROL FUTABA T HOBBY SNACK rROYAL LINE ATTENTION QUARTER & GIANT SCALE MQDELERS LLITSAP need iti LLIT-SAP multiple servo LONG LEAD INTERFERENCE TRAP & SERVO ALTERNATE POWER adap tor Specify radio ordering $2995 postage paid send large SSAE for literature
Edition: Model Aviation - 1983/08
Page Numbers: 38, 39, 145, 148, 149, 150
a loec ni ue George M Myers TUNING YOUR RECEIVER often receive another pound newsletters AMA HQ Based what read some folks overreacting possible RC interference good aware what may happen think wrong tell ourselves will always happen thereby start limiting ourselves un necessarily point fact have flying new RC channels past six months have deliberately invited kind potential interference Ive seen discussed So far using radios built 1970 1976 1978 1980 1982 setting up adjacent-channel 40 KHz interference second-order third-order intermodulation image main thing Ive discovered isnt problem test results mean anything say old radios will work fine new RC Problem AdjacentChannel Interference 2nd Order Intermodula tion 3rd Order Intermodula tion Image 7304o 730464 730454 7287 4 7287 7259 7 73045 7259 7240 CoNTRoL Ov 0 0 0 z LEAVE IT HERE George tells tune RC receiverthis isthewaytodoaniF can As example Bob Aberle Tom Hunt went out other day run another test Bob 72400 0/W Tom RC54 72870 plane RC4O 72590 stood bunch transmitters ON antennas extended plane showed us interference sent Bob out 15 ft side Tom out 15 ft opposite direction interference went away fired up engine took off flew around over headsup high down lowand landed gn trouble changed system RC56 repeated test Again no prob lems Thats typical test its result channels just use head Keep little distance between transmitters 20 ft .% sosticktotheAMARCFrequencyControl Plan keep receivers tune dont taxi QV THING FROM 72MHZ TO 73 MHZ 0SIGNALS SUMSMODULATEDSERIAL MOSTLY VHFAND DIFFRENCE455 MHZCONTROL -FREQUENCIESIFONLYPULSES ORIY SIGNALSTUNED RFMIXERAMPUFIEROETECTORDEMODULATOR OThER RCANTENNASECTION MS AI4D tAILIAI RAD DIFFERENSCONTROL PULSES TO INDIVIDUAL c0 q CALSERVOS OSCILLATORONE VERY PRECISE FREQUENCY block diagram depictS whats going RC receiver Theres lots additional explanation column 38 Model Aviation istho wasi pit area little monitoring testing necessary youll make out fine typical IF can transformer sifting metric scale Its cm George didnt notice slugs screw slot still filled beeswax until enlarged photo tuning screw slug visible through hole top can FREQLINCIES NOW AVAILABLE Academy Model Aeronautics pleased nounce sev eral years coor dination activities S Sbetween its RC Frequency Com mittee VHF/UHF Advisory Committee American Radio Relay League ARRL have re suIted agreement new set RC frequencies set aside RC oper ations amateur six-meter band new frequencies immediately available use RCers hold valid FCC Amateur Radio License Technician Class higher Specifically 200 kHz sub-band ex tending 50800 MHz 51000 MHz has designated RC use new ARRL Six-Meter Band Plan just ap proved ARRL Board Directors RC sub-band has further sub divided 10 RC channels Nos 00 09 using 20 kHz spacing between channels Note 20 kHz channel spacing identical spacing new 72 MHz frequencies cause BC equipment yet generally available will safely operate such closely-spaced adjacent channels AMA Six-Meter Phase-In Plan similar 72 MHz Phase-In Plan will effect next eight years plan see box calls use five even-numbered channels during phase-in period thus providing 40 kHz channel separation during timea separation clearly within capabilities equipment currently available amateur-licensed RCers long accustomed operating 53 MHz frequencies AMA hastens re assure continued use frequencies remains perfectly legal frequencies will continue accepted entry AMAsanctioned events However sixmeter RCers should understand background original AMA uni lateral adoption 53 MHz frequen cies RC use developments since time amateur commu nications world have begun cause increasing problems frequencies certain parts countryproblems will lieve inevitably lead gradual shift new frequencies six-meter RC fliers over next five eight years AMA firmly believes mutual recognition new 50800-51000 MHz RC sub-band both AMA ARRL marks major step forward six-meter affairs pro viding what promises relatively interference-free home six-meter fliers indefinite future AMA extend appreciation counterparts ARRL fine spirit cooperation assistance bringing action successful con clusion As usual matters sort much detailed time-consuming effort required part AMA RC Frequency Committee members primarily involved coordi nation activities ARRL Special credit goes former committee member Dick Jansson WD4FAB served principal coordinator former committee chairman Bob Aberle W2QPP played key role orga nizing effort AMAs licensed amateur RC fliers action another example ongoing efforts organization lead way improving aspects mutual hobby AMA also lieves action will benefit RC dustry urges equipment manufac turers seriously consider offering newest lines equipment new 50 MHz Phase-In channels numbers subtract rest 72400 72870 must get 470 first figure attempt make mixing product receiver 455 aware fact electrical signal IF amplifier broad enough 470 can world presented antenna get through cause interference receiver has seek out respond other hand IF properly tuned will transmitters weak little signal reject interference thats exactly consider TV signal goes out what happened Another bugaboo put thousands watts RC trans MHZ BLACK____ WHITE YELLOW*\FREQUENCY RESULT HZ 1/2nd-ORDERIM ISE TUNING two ways tune typical RC receiver right way L stagger tUned RI will allow certain types interference get system Follow Georges procedure tuning receiver avoid stagger tuning though receiver will still work mitter puts out about /2 watt see what job receiver antenna cut specific length usually meter Thus responds best VHF signals length antenna therefore performs first bit filtering tuned RF section fed mostly VHF signals antenna As conse quence way tuned TRF seeContinued page 145 / //4 /$d\\ STAGGER TUNING August 1983 39 AMA painted flat Pactra Formula U covered fuselage silk gets around compound curves easily weight adds negligible fuse lage given four coats nitrate dope final finish light coat Formula U olive drab followed light coat camouflage flat tan Before painting wiped MonoKote areas acetone remove oil dirt Decals produced Dave Platt Models very close proper size model Control rods used Suliivan Gold-NRod cable type lightweight flexible can easily positioned through fuselage bulkheads cable system moving elevator rudder makes very neat installa tion like attach cable servo arms either Du-Bro Gold berg easy connectors rig con trols setup need loosen screw connector move cable fore aft get desired result Flying Did get everything lined-up properly wing tips have cor rect amount washout Are control attachment points secure Are wheels tight Dont laugh Ive seen new ship leave wheel roll ing down runway lifted off cause pre-flight check overlooked takes small item destroy three four months work Check balance point should fall between 25% 30% wing chord Dont fly ship tail-heavy rearward balance point courting snap-roll disaster sure CC correct point model tested 13-in-dia 8-in-pitch prop did very well once trimmed out Later tried 12-8 13-incher seemed put out much thrust 530 sq wing area model handles 4-lb total weight ease During test flights motor battery closely watched bit concerned might heat up too much seems stay very cooL believe Hurricane would really perform new Cobalt motors Maybe Ill try later now Im having ball straight Astro 15 gear unit dont think will have regrets build ship took Hurri cane Valley Flyers Contest California stole show youre looking fun Scale project has great looks flyabiity SAFE FLYING IS NO ACCIDENT ************* *** ** WW***W * * * * WANDITTM * *Dealers Invited * * COn yOar warranty * ~J -K *CORD *Wet DryK * Stich AbrasivesK K *A Keen Machine' gives enceptionalK *sanding control encellent finish* * * 8995 Basic OcI 1 flat Wand 1 * ritsK *10895 Builder Special mcI 2 fIat 1 half * ano wand 5 6 grtsK *12995 Delver includes 3 flar 2 halfK * nd wauds buff wanos andK -K * 6 grits * *Addtional Wands Abrasves ava ableK * e local hobby shopK *K *80015 ELMORE Eoe No 1214 288 5780K * P 0 Box 266 uite Texas 75149K K KKKKKKKKKK*K Radio Technique/Myers Continued page 39 tion selectively amplifies signals between 72 73 MHz rest gives us second stage filtering Meanwhile crystal-controlled oscillator LO receiver running fre quency precisely 455 MHz above transmitters frequency oscil lators voltage frequency injected mixer along amplified RE voltages IRE section mixer frequency present mixed other frequency present including local oscillator mixing new fre Continued page 148 August 1983 145 INTRODUCING THE NEW FOX 36 RC Schneurle Ported Ball Bearing Main BRAND NEW 36 RC.evolved highly successful Combat Special took highly successful Fox Combat Special fitted new MarkXtype carburetor made porting head modifications get run idle well no-nitro fuel Result.the powerful 36 RC market new Fox 36 RC combines power superb idling characteristics light weight.and delivers lowest cost fuels 23900 Fox 36 RO$5995 90236 TiltUp Muffler1495 90237 Tilt-Down Muffler1495 F 0 X MANUFACTURING Co 5305 TDWSON AVEFORT SMITH ARK 72901 Hot Line SOif 686-1656 IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CID QUADRA$10950 Req 22 QUADRA $10450 Brisighelle Flywheel 012450 Req 22 QUADRA POWER ASSEMBLY ONLY 86450 QUADRA REPAIR 1000 pIes pews Jim Mesner ERCOUPEPLANS 82395 KIT $23995 Jim Messe TOMAHAWKPLANS $2395 KIT $25995 Jinx Messe 9-BALL TRAINER PLANS $1695 KIT $9995 BALSA end BASSWOOD fell siesI 35% OFF Connept FLEET PLANS $2995 KIT $15995 COWL $1995 P6W RADIAL ENGINES tar Fleet $2495 VICKERS LEWIS MACHINE GUN KITS $1495 CECONITE Podunts 10% OFF Siq J3 CUB KIT $12495 PLANS SUPER STEARMAN IGedfreyl $2095 STARDUSTER TOO IBrisighellel J3 CUB NeIit $2995 VOLKSPLANE IChinken Cherliel $2395 COCKPIT KITS Tonehewk F4U-1 Spitfire $2295 Ernoepe $2095 Steernien 82295 Citebrie $2495 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Ocedre FUEL TANKSlOne $695 32 en $795 FIBERGLASS ARROW SHAFTS 511$ s 32 long 61$1l1110 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 VelleY View Dr Allegeny NY 14706 AU NEW cusro SCNNEURLE cox 009 ENGINES Racing & Stunt versions special hard chrome & honing technology Also Complete inventory individual stock custom parts Cox TD 020 049 051 & 09 engines Competition parts & accessories Combat Free Fit C/L & A/C Racing Speed Stunt & Team Race Exclusive distributor Nelson 15 engIne & parts detailed catalog send 50 cents Kustom Kraftsmanshlp Box 2699 Laguna Hills CA 92653 Telephone 714 830-5162 Dynathrusts composite construction provides Unequaled Durability Saves money 100% accurate pitch results Outstanding Performance Air Counts s7OO slOO0 $1400 15x 6 18x 6- 8- 10 20x 6-8 10 _____22x 810180O Prices rclsde UPS charges LII MASTER CHARGE []VISA E]COD []CHECK []MONEY ORDER Dealers / Distributors invited THRUST PROPS ING 2541 NE lith Court Pompano Beah FL 33062 1305941 9119 Radio Technique/Myers Contmnoed oae 145 quencieS formed both sums differences originals strength mixing products depends voltages inputs frequen cies presented IF amplifier IF intermediate frequency amplifier very special kind amplifier frequency-sensitive will amplify 455 MHz Everything else rejected IF strip tuned properly Thus IF strip provides third stage filtering Please take word 455 MHz coming out IF strip carries con trol information detector strips formation out 455 MHz blocks 455 MHz voltage traveling fur ther presents control pulses decoder serial form like string box- cars decoder uncouples boxcars sending its proper servo its unique control pulse decoder provides serial-to-parallel sorting function also prunes away whatever trash may have gotten past detector providing final filter brief description should see keeping IF strip tune critically important typical IF strip holds three IF transformers little metal can about x 6 usually fitted screw inside colored black white yellow screw made compressed metal powder should too much tuning will wear edges off threads result screw wont hold adjustment Re-tune receiver necessary tune IF transformer Turn system send out someone transmitter having antenna collapsed have him walk limits control stop await instruction 2 take Ace RC 60K27 tuning wand sharpened hardwood stick rotate tuning screw turn clockwise /2 turn counter clockwise noting positions control lost Leave screw its middle position customary adjust IF transformers order yellow white blackDo three screws 3 Send friend transmitter out limit control again should further outtune again 4 Repeat till youve got maximum range helps friend keeps cycling control sticks back forth know control lost/regained Finish job dripping little melted beeswax screw keep place get beeswax sewing goods store Dritz No 623 peg-board Roll piece strip like matchstick heat sol dering iron drip drip drip e may wonder IF must ad justable precise answer lies fact crystals have real variation absolute frequency law allowed tolerance 0025% works out cycles per second 72960 MHz 835 cycles per second LO WHY SETTLE FOR LESS can have PerformaflCCOflomY 148 Model Aviation Engines Radios Mufflers Custom Carburators Gyros SUPER MINI-BOY VIDEO MINIATURE AIRCRAFT SUPPLY BRINGS YOU ANOTHER HELICOPTER FIRST Professionally produced video takes workshop professionally build set up flight trim mini-boy Includes step step building parts iden tification mechanical operational walk through radio installation balancing bench setup operational flight trimming aerobatics video better having someone else build Mini-Boy Video produced Mike Mas National Helicopter Champion Available ary 1983 BETA VHS WE CAN SUPPLY ALL OF YOUR HELICOPTER NEEDS AT UNBEATABLE PRICESI Worlds Strongest Epoxy Glues Training Stands MIni-Boy Competition Pack Wide-Landing Gear Training Aids Float Kits Video Cassettes Helicopter Tools MOVE UP TO SCNLUTER S See Dealer Call MINIATURE AIRCRAFT SUPPLY 2594 North Orange Blossom Trail ndo FL 32804 e 305 422-1531 crystals frequency 73415 MHz Thus difference between transmitters crystal receivers local oscillator crystal may anything 458659 451341 cps order pick up trans mitters signal IF has adjustable over same range Actually manu facturer will have lot crystals choose have right expect variation crystal will matchcd similar variation other re sult difference will very close nominal 455 MI-lz Ive talking about previous paragraphs same time should see reluctance some people accept idea interchangeable crystals comes might have pair crystals end range break replace another crystal having same nom inal frequency actually other end tolerance band thereby end ing up system out alignment 36% 3659 cycles out bandwidth 10000 reason specifying beeswax stays soft permitting easy removal later Candle wax sealing wax gets harder Youll probably notice other coils transformers PC board usually close August 1983 149 ORDER YOUR VIDEO NOW 5 Plus Shipping Ace AC Silver Seven receiver typical modern RC receiver George has delineated three IF cans us Most RC receivers service have similar appearance though parts may arranged different manner Krafts forthcoming 1991 Receiver shown Weak Signals show Toledo 1983 true 10 kHz narrow-band receiver dual-conversion FM signals present receivers AM block middle marked 7A N crystal filterreplaces 455 MHz IF cans used other receivers adjustable component adjustable IF cans 107 MHz IF stripwhich makes tuning pretty easy Kraft didnt quote price George knows wont cheapyet much new plane worth antenna TRF section rarely need retuning Leave alone waste lot time Some receivers dual-conversion types easily identified presence extra crystal usually 11155 MHz extra IF transformers Tuning done same way before except 107 MHz IF strip first may have trouble identifying IF transformers besides dual-conversion tuning itself pain head Most folks prefer leave professionals have proper equipment make job easier Ive included couple examples will know what am discussing own judge whether want take job Transmitters need occasional tuning dont wont have proper tools control harmonic emissions Besides Federal Law requires transmitter tuning done holders Commercial license Send back manufac turer George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 FF Old-Timers/Haught Continued page 59 problem surfacedthat softening ni trate finishes alcohol-based fuels Early solutions varnish-based hot fuel proofers created weight patch ing problems Butyrate dopes apparent solu tion modelers problems does have major disadvantage never quits shrinkine Eve observed full-size aircraft fu selage stringers flying surface trailing edges hopelessly warped distorted ravages butvrate dope variation known non-tautenine CAB exists readily available through model supply houses now youve probably concluded nitrate dope way go OldTimers powercd ignition engines Now comes question applicationto brush spray Spraying gives smoothest finish brushing good camel-hair brush will give acceptable results Initial coats least two should brushed lncoqporated 322 Sa Gallatin Rd son TN 37115 615 868-6811Mon thru Sat am 500 pm SALES ______________________ RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOS IlI Ill -- insure good bond covering Use brush tissue silkspan silk try new foam brushes flow dope Using brush silk allows dope work through cloth run down back side causing ugly blisters known cure blisters cut out apply patch Thin dope enough work undue brushing thin coats will take seal covering Spraying will re quire thinner coats Separate thinners available nitrate butyrate dope use just thinner both automotive acrylic lacquer thinner Get best three grades available Too much thinning either brush spray appli cations leads runs use sparingly spraying dope too thick finish will have orange peel effect Add thinner and/or hold spray gun far ther surface minimize effect As previously mentioned apply enough dope seal covering airtight fuelproof Build up finish clear dope add pigmented dope color desired Clear dope over colored covering works great lightweight applying color dope over clear sometimes small pin holes show up indicating covering sufficiently sealed Add clear dope try again common dope troubles blushing indicated milky film appearing surface dope dries phenomenon caused rapid evaporation highly-volatile mate rial cooling action will cause moisture condense surface freshly-applied dope resulting milky appearance Blushed dope has no gloss remedy blushing slow drying process addition 5% retarder added thinner used Retarder available automotive paint supply houses will have buy gallon Better try small amount auto body repair shop take own can retarder avail able try postponing doping until less humid day Dopes available retail hobby out lets sometimes nitrate dopes stocked may have ordered Local Fine Quality flying Models 98 RUBBER POWER KITS plus Gliders C/L RIC AccessOriCS Books Catatog 3150 4 8 4 4 * MAJESTIC MODELS 3273 West 129th Street Cleveland Ohio 44111 150 Model Aviation Magic Dragon Trainer Engine Size 25Pre Built Wing Span 55 in$9995 3 4 ChannelsPlus shipping Lives Up Toand handling Its Name__MAGIC! balsa construction Ready fine sand cover Control surfaces hinged HalIco landing gear u nose gear strut Fitted canopy Instruction booklet hardware included Fire Fox Ultimate Sport FlyingPre Built Engine Size 40$12495 Wing Span 52h inPlu shipping handling 4 Channels balsa construction Ready fine sand cover Control surfaces hinged Has bolton wire HalIco landing gear wheel pants mounted axels installed Fitted canopy Instruction booklet hardware included Designers Builders Fine PRE-BUIL T R/C Models Order Today Send check MO also accept Master Card VisaModels shipped 350 PSI carton via UPS Shipping handling $850 Fl residents add 5% sales tax AEROTECH R/C 3850 US Hwy 19 No. Palm Harbor FL 33563 81319383266 have SIX other models available Send Now free brochure Dealer Inquiries Invited REPAIR SERVICE FOR HOBBY LOBBY EK LOGICTROL FUTABA T HOBBY SNACK rROYAL LINE ATTENTION QUARTER & GIANT SCALE MQDELERS LLITSAP need iti LLIT-SAP multiple servo LONG LEAD INTERFERENCE TRAP & SERVO ALTERNATE POWER adap tor Specify radio ordering $2995 postage paid send large SSAE for literature
Edition: Model Aviation - 1983/08
Page Numbers: 38, 39, 145, 148, 149, 150
a loec ni ue George M Myers TUNING YOUR RECEIVER often receive another pound newsletters AMA HQ Based what read some folks overreacting possible RC interference good aware what may happen think wrong tell ourselves will always happen thereby start limiting ourselves un necessarily point fact have flying new RC channels past six months have deliberately invited kind potential interference Ive seen discussed So far using radios built 1970 1976 1978 1980 1982 setting up adjacent-channel 40 KHz interference second-order third-order intermodulation image main thing Ive discovered isnt problem test results mean anything say old radios will work fine new RC Problem AdjacentChannel Interference 2nd Order Intermodula tion 3rd Order Intermodula tion Image 7304o 730464 730454 7287 4 7287 7259 7 73045 7259 7240 CoNTRoL Ov 0 0 0 z LEAVE IT HERE George tells tune RC receiverthis isthewaytodoaniF can As example Bob Aberle Tom Hunt went out other day run another test Bob 72400 0/W Tom RC54 72870 plane RC4O 72590 stood bunch transmitters ON antennas extended plane showed us interference sent Bob out 15 ft side Tom out 15 ft opposite direction interference went away fired up engine took off flew around over headsup high down lowand landed gn trouble changed system RC56 repeated test Again no prob lems Thats typical test its result channels just use head Keep little distance between transmitters 20 ft .% sosticktotheAMARCFrequencyControl Plan keep receivers tune dont taxi QV THING FROM 72MHZ TO 73 MHZ 0SIGNALS SUMSMODULATEDSERIAL MOSTLY VHFAND DIFFRENCE455 MHZCONTROL -FREQUENCIESIFONLYPULSES ORIY SIGNALSTUNED RFMIXERAMPUFIEROETECTORDEMODULATOR OThER RCANTENNASECTION MS AI4D tAILIAI RAD DIFFERENSCONTROL PULSES TO INDIVIDUAL c0 q CALSERVOS OSCILLATORONE VERY PRECISE FREQUENCY block diagram depictS whats going RC receiver Theres lots additional explanation column 38 Model Aviation istho wasi pit area little monitoring testing necessary youll make out fine typical IF can transformer sifting metric scale Its cm George didnt notice slugs screw slot still filled beeswax until enlarged photo tuning screw slug visible through hole top can FREQLINCIES NOW AVAILABLE Academy Model Aeronautics pleased nounce sev eral years coor dination activities S Sbetween its RC Frequency Com mittee VHF/UHF Advisory Committee American Radio Relay League ARRL have re suIted agreement new set RC frequencies set aside RC oper ations amateur six-meter band new frequencies immediately available use RCers hold valid FCC Amateur Radio License Technician Class higher Specifically 200 kHz sub-band ex tending 50800 MHz 51000 MHz has designated RC use new ARRL Six-Meter Band Plan just ap proved ARRL Board Directors RC sub-band has further sub divided 10 RC channels Nos 00 09 using 20 kHz spacing between channels Note 20 kHz channel spacing identical spacing new 72 MHz frequencies cause BC equipment yet generally available will safely operate such closely-spaced adjacent channels AMA Six-Meter Phase-In Plan similar 72 MHz Phase-In Plan will effect next eight years plan see box calls use five even-numbered channels during phase-in period thus providing 40 kHz channel separation during timea separation clearly within capabilities equipment currently available amateur-licensed RCers long accustomed operating 53 MHz frequencies AMA hastens re assure continued use frequencies remains perfectly legal frequencies will continue accepted entry AMAsanctioned events However sixmeter RCers should understand background original AMA uni lateral adoption 53 MHz frequen cies RC use developments since time amateur commu nications world have begun cause increasing problems frequencies certain parts countryproblems will lieve inevitably lead gradual shift new frequencies six-meter RC fliers over next five eight years AMA firmly believes mutual recognition new 50800-51000 MHz RC sub-band both AMA ARRL marks major step forward six-meter affairs pro viding what promises relatively interference-free home six-meter fliers indefinite future AMA extend appreciation counterparts ARRL fine spirit cooperation assistance bringing action successful con clusion As usual matters sort much detailed time-consuming effort required part AMA RC Frequency Committee members primarily involved coordi nation activities ARRL Special credit goes former committee member Dick Jansson WD4FAB served principal coordinator former committee chairman Bob Aberle W2QPP played key role orga nizing effort AMAs licensed amateur RC fliers action another example ongoing efforts organization lead way improving aspects mutual hobby AMA also lieves action will benefit RC dustry urges equipment manufac turers seriously consider offering newest lines equipment new 50 MHz Phase-In channels numbers subtract rest 72400 72870 must get 470 first figure attempt make mixing product receiver 455 aware fact electrical signal IF amplifier broad enough 470 can world presented antenna get through cause interference receiver has seek out respond other hand IF properly tuned will transmitters weak little signal reject interference thats exactly consider TV signal goes out what happened Another bugaboo put thousands watts RC trans MHZ BLACK____ WHITE YELLOW*\FREQUENCY RESULT HZ 1/2nd-ORDERIM ISE TUNING two ways tune typical RC receiver right way L stagger tUned RI will allow certain types interference get system Follow Georges procedure tuning receiver avoid stagger tuning though receiver will still work mitter puts out about /2 watt see what job receiver antenna cut specific length usually meter Thus responds best VHF signals length antenna therefore performs first bit filtering tuned RF section fed mostly VHF signals antenna As conse quence way tuned TRF seeContinued page 145 / //4 /$d\\ STAGGER TUNING August 1983 39 AMA painted flat Pactra Formula U covered fuselage silk gets around compound curves easily weight adds negligible fuse lage given four coats nitrate dope final finish light coat Formula U olive drab followed light coat camouflage flat tan Before painting wiped MonoKote areas acetone remove oil dirt Decals produced Dave Platt Models very close proper size model Control rods used Suliivan Gold-NRod cable type lightweight flexible can easily positioned through fuselage bulkheads cable system moving elevator rudder makes very neat installa tion like attach cable servo arms either Du-Bro Gold berg easy connectors rig con trols setup need loosen screw connector move cable fore aft get desired result Flying Did get everything lined-up properly wing tips have cor rect amount washout Are control attachment points secure Are wheels tight Dont laugh Ive seen new ship leave wheel roll ing down runway lifted off cause pre-flight check overlooked takes small item destroy three four months work Check balance point should fall between 25% 30% wing chord Dont fly ship tail-heavy rearward balance point courting snap-roll disaster sure CC correct point model tested 13-in-dia 8-in-pitch prop did very well once trimmed out Later tried 12-8 13-incher seemed put out much thrust 530 sq wing area model handles 4-lb total weight ease During test flights motor battery closely watched bit concerned might heat up too much seems stay very cooL believe Hurricane would really perform new Cobalt motors Maybe Ill try later now Im having ball straight Astro 15 gear unit dont think will have regrets build ship took Hurri cane Valley Flyers Contest California stole show youre looking fun Scale project has great looks flyabiity SAFE FLYING IS NO ACCIDENT ************* *** ** WW***W * * * * WANDITTM * *Dealers Invited * * COn yOar warranty * ~J -K *CORD *Wet DryK * Stich AbrasivesK K *A Keen Machine' gives enceptionalK *sanding control encellent finish* * * 8995 Basic OcI 1 flat Wand 1 * ritsK *10895 Builder Special mcI 2 fIat 1 half * ano wand 5 6 grtsK *12995 Delver includes 3 flar 2 halfK * nd wauds buff wanos andK -K * 6 grits * *Addtional Wands Abrasves ava ableK * e local hobby shopK *K *80015 ELMORE Eoe No 1214 288 5780K * P 0 Box 266 uite Texas 75149K K KKKKKKKKKK*K Radio Technique/Myers Continued page 39 tion selectively amplifies signals between 72 73 MHz rest gives us second stage filtering Meanwhile crystal-controlled oscillator LO receiver running fre quency precisely 455 MHz above transmitters frequency oscil lators voltage frequency injected mixer along amplified RE voltages IRE section mixer frequency present mixed other frequency present including local oscillator mixing new fre Continued page 148 August 1983 145 INTRODUCING THE NEW FOX 36 RC Schneurle Ported Ball Bearing Main BRAND NEW 36 RC.evolved highly successful Combat Special took highly successful Fox Combat Special fitted new MarkXtype carburetor made porting head modifications get run idle well no-nitro fuel Result.the powerful 36 RC market new Fox 36 RC combines power superb idling characteristics light weight.and delivers lowest cost fuels 23900 Fox 36 RO$5995 90236 TiltUp Muffler1495 90237 Tilt-Down Muffler1495 F 0 X MANUFACTURING Co 5305 TDWSON AVEFORT SMITH ARK 72901 Hot Line SOif 686-1656 IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CID QUADRA$10950 Req 22 QUADRA $10450 Brisighelle Flywheel 012450 Req 22 QUADRA POWER ASSEMBLY ONLY 86450 QUADRA REPAIR 1000 pIes pews Jim Mesner ERCOUPEPLANS 82395 KIT $23995 Jim Messe TOMAHAWKPLANS $2395 KIT $25995 Jinx Messe 9-BALL TRAINER PLANS $1695 KIT $9995 BALSA end BASSWOOD fell siesI 35% OFF Connept FLEET PLANS $2995 KIT $15995 COWL $1995 P6W RADIAL ENGINES tar Fleet $2495 VICKERS LEWIS MACHINE GUN KITS $1495 CECONITE Podunts 10% OFF Siq J3 CUB KIT $12495 PLANS SUPER STEARMAN IGedfreyl $2095 STARDUSTER TOO IBrisighellel J3 CUB NeIit $2995 VOLKSPLANE IChinken Cherliel $2395 COCKPIT KITS Tonehewk F4U-1 Spitfire $2295 Ernoepe $2095 Steernien 82295 Citebrie $2495 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Ocedre FUEL TANKSlOne $695 32 en $795 FIBERGLASS ARROW SHAFTS 511$ s 32 long 61$1l1110 24-Hour Service. Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 VelleY View Dr Allegeny NY 14706 AU NEW cusro SCNNEURLE cox 009 ENGINES Racing & Stunt versions special hard chrome & honing technology Also Complete inventory individual stock custom parts Cox TD 020 049 051 & 09 engines Competition parts & accessories Combat Free Fit C/L & A/C Racing Speed Stunt & Team Race Exclusive distributor Nelson 15 engIne & parts detailed catalog send 50 cents Kustom Kraftsmanshlp Box 2699 Laguna Hills CA 92653 Telephone 714 830-5162 Dynathrusts composite construction provides Unequaled Durability Saves money 100% accurate pitch results Outstanding Performance Air Counts s7OO slOO0 $1400 15x 6 18x 6- 8- 10 20x 6-8 10 _____22x 810180O Prices rclsde UPS charges LII MASTER CHARGE []VISA E]COD []CHECK []MONEY ORDER Dealers / Distributors invited THRUST PROPS ING 2541 NE lith Court Pompano Beah FL 33062 1305941 9119 Radio Technique/Myers Contmnoed oae 145 quencieS formed both sums differences originals strength mixing products depends voltages inputs frequen cies presented IF amplifier IF intermediate frequency amplifier very special kind amplifier frequency-sensitive will amplify 455 MHz Everything else rejected IF strip tuned properly Thus IF strip provides third stage filtering Please take word 455 MHz coming out IF strip carries con trol information detector strips formation out 455 MHz blocks 455 MHz voltage traveling fur ther presents control pulses decoder serial form like string box- cars decoder uncouples boxcars sending its proper servo its unique control pulse decoder provides serial-to-parallel sorting function also prunes away whatever trash may have gotten past detector providing final filter brief description should see keeping IF strip tune critically important typical IF strip holds three IF transformers little metal can about x 6 usually fitted screw inside colored black white yellow screw made compressed metal powder should too much tuning will wear edges off threads result screw wont hold adjustment Re-tune receiver necessary tune IF transformer Turn system send out someone transmitter having antenna collapsed have him walk limits control stop await instruction 2 take Ace RC 60K27 tuning wand sharpened hardwood stick rotate tuning screw turn clockwise /2 turn counter clockwise noting positions control lost Leave screw its middle position customary adjust IF transformers order yellow white blackDo three screws 3 Send friend transmitter out limit control again should further outtune again 4 Repeat till youve got maximum range helps friend keeps cycling control sticks back forth know control lost/regained Finish job dripping little melted beeswax screw keep place get beeswax sewing goods store Dritz No 623 peg-board Roll piece strip like matchstick heat sol dering iron drip drip drip e may wonder IF must ad justable precise answer lies fact crystals have real variation absolute frequency law allowed tolerance 0025% works out cycles per second 72960 MHz 835 cycles per second LO WHY SETTLE FOR LESS can have PerformaflCCOflomY 148 Model Aviation Engines Radios Mufflers Custom Carburators Gyros SUPER MINI-BOY VIDEO MINIATURE AIRCRAFT SUPPLY BRINGS YOU ANOTHER HELICOPTER FIRST Professionally produced video takes workshop professionally build set up flight trim mini-boy Includes step step building parts iden tification mechanical operational walk through radio installation balancing bench setup operational flight trimming aerobatics video better having someone else build Mini-Boy Video produced Mike Mas National Helicopter Champion Available ary 1983 BETA VHS WE CAN SUPPLY ALL OF YOUR HELICOPTER NEEDS AT UNBEATABLE PRICESI Worlds Strongest Epoxy Glues Training Stands MIni-Boy Competition Pack Wide-Landing Gear Training Aids Float Kits Video Cassettes Helicopter Tools MOVE UP TO SCNLUTER S See Dealer Call MINIATURE AIRCRAFT SUPPLY 2594 North Orange Blossom Trail ndo FL 32804 e 305 422-1531 crystals frequency 73415 MHz Thus difference between transmitters crystal receivers local oscillator crystal may anything 458659 451341 cps order pick up trans mitters signal IF has adjustable over same range Actually manu facturer will have lot crystals choose have right expect variation crystal will matchcd similar variation other re sult difference will very close nominal 455 MI-lz Ive talking about previous paragraphs same time should see reluctance some people accept idea interchangeable crystals comes might have pair crystals end range break replace another crystal having same nom inal frequency actually other end tolerance band thereby end ing up system out alignment 36% 3659 cycles out bandwidth 10000 reason specifying beeswax stays soft permitting easy removal later Candle wax sealing wax gets harder Youll probably notice other coils transformers PC board usually close August 1983 149 ORDER YOUR VIDEO NOW 5 Plus Shipping Ace AC Silver Seven receiver typical modern RC receiver George has delineated three IF cans us Most RC receivers service have similar appearance though parts may arranged different manner Krafts forthcoming 1991 Receiver shown Weak Signals show Toledo 1983 true 10 kHz narrow-band receiver dual-conversion FM signals present receivers AM block middle marked 7A N crystal filterreplaces 455 MHz IF cans used other receivers adjustable component adjustable IF cans 107 MHz IF stripwhich makes tuning pretty easy Kraft didnt quote price George knows wont cheapyet much new plane worth antenna TRF section rarely need retuning Leave alone waste lot time Some receivers dual-conversion types easily identified presence extra crystal usually 11155 MHz extra IF transformers Tuning done same way before except 107 MHz IF strip first may have trouble identifying IF transformers besides dual-conversion tuning itself pain head Most folks prefer leave professionals have proper equipment make job easier Ive included couple examples will know what am discussing own judge whether want take job Transmitters need occasional tuning dont wont have proper tools control harmonic emissions Besides Federal Law requires transmitter tuning done holders Commercial license Send back manufac turer George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 FF Old-Timers/Haught Continued page 59 problem surfacedthat softening ni trate finishes alcohol-based fuels Early solutions varnish-based hot fuel proofers created weight patch ing problems Butyrate dopes apparent solu tion modelers problems does have major disadvantage never quits shrinkine Eve observed full-size aircraft fu selage stringers flying surface trailing edges hopelessly warped distorted ravages butvrate dope variation known non-tautenine CAB exists readily available through model supply houses now youve probably concluded nitrate dope way go OldTimers powercd ignition engines Now comes question applicationto brush spray Spraying gives smoothest finish brushing good camel-hair brush will give acceptable results Initial coats least two should brushed lncoqporated 322 Sa Gallatin Rd son TN 37115 615 868-6811Mon thru Sat am 500 pm SALES ______________________ RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOS IlI Ill -- insure good bond covering Use brush tissue silkspan silk try new foam brushes flow dope Using brush silk allows dope work through cloth run down back side causing ugly blisters known cure blisters cut out apply patch Thin dope enough work undue brushing thin coats will take seal covering Spraying will re quire thinner coats Separate thinners available nitrate butyrate dope use just thinner both automotive acrylic lacquer thinner Get best three grades available Too much thinning either brush spray appli cations leads runs use sparingly spraying dope too thick finish will have orange peel effect Add thinner and/or hold spray gun far ther surface minimize effect As previously mentioned apply enough dope seal covering airtight fuelproof Build up finish clear dope add pigmented dope color desired Clear dope over colored covering works great lightweight applying color dope over clear sometimes small pin holes show up indicating covering sufficiently sealed Add clear dope try again common dope troubles blushing indicated milky film appearing surface dope dries phenomenon caused rapid evaporation highly-volatile mate rial cooling action will cause moisture condense surface freshly-applied dope resulting milky appearance Blushed dope has no gloss remedy blushing slow drying process addition 5% retarder added thinner used Retarder available automotive paint supply houses will have buy gallon Better try small amount auto body repair shop take own can retarder avail able try postponing doping until less humid day Dopes available retail hobby out lets sometimes nitrate dopes stocked may have ordered Local Fine Quality flying Models 98 RUBBER POWER KITS plus Gliders C/L RIC AccessOriCS Books Catatog 3150 4 8 4 4 * MAJESTIC MODELS 3273 West 129th Street Cleveland Ohio 44111 150 Model Aviation Magic Dragon Trainer Engine Size 25Pre Built Wing Span 55 in$9995 3 4 ChannelsPlus shipping Lives Up Toand handling Its Name__MAGIC! balsa construction Ready fine sand cover Control surfaces hinged HalIco landing gear u nose gear strut Fitted canopy Instruction booklet hardware included Fire Fox Ultimate Sport FlyingPre Built Engine Size 40$12495 Wing Span 52h inPlu shipping handling 4 Channels balsa construction Ready fine sand cover Control surfaces hinged Has bolton wire HalIco landing gear wheel pants mounted axels installed Fitted canopy Instruction booklet hardware included Designers Builders Fine PRE-BUIL T R/C Models Order Today Send check MO also accept Master Card VisaModels shipped 350 PSI carton via UPS Shipping handling $850 Fl residents add 5% sales tax AEROTECH R/C 3850 US Hwy 19 No. Palm Harbor FL 33563 81319383266 have SIX other models available Send Now free brochure Dealer Inquiries Invited REPAIR SERVICE FOR HOBBY LOBBY EK LOGICTROL FUTABA T HOBBY SNACK rROYAL LINE ATTENTION QUARTER & GIANT SCALE MQDELERS LLITSAP need iti LLIT-SAP multiple servo LONG LEAD INTERFERENCE TRAP & SERVO ALTERNATE POWER adap tor Specify radio ordering $2995 postage paid send large SSAE for literature
Edition: Model Aviation - 1983/08
Page Numbers: 38, 39, 145, 148, 149, 150
a loec ni ue George M Myers TUNING YOUR RECEIVER often receive another pound newsletters AMA HQ Based what read some folks overreacting possible RC interference good aware what may happen think wrong tell ourselves will always happen thereby start limiting ourselves un necessarily point fact have flying new RC channels past six months have deliberately invited kind potential interference Ive seen discussed So far using radios built 1970 1976 1978 1980 1982 setting up adjacent-channel 40 KHz interference second-order third-order intermodulation image main thing Ive discovered isnt problem test results mean anything say old radios will work fine new RC Problem AdjacentChannel Interference 2nd Order Intermodula tion 3rd Order Intermodula tion Image 7304o 730464 730454 7287 4 7287 7259 7 73045 7259 7240 CoNTRoL Ov 0 0 0 z LEAVE IT HERE George tells tune RC receiverthis isthewaytodoaniF can As example Bob Aberle Tom Hunt went out other day run another test Bob 72400 0/W Tom RC54 72870 plane RC4O 72590 stood bunch transmitters ON antennas extended plane showed us interference sent Bob out 15 ft side Tom out 15 ft opposite direction interference went away fired up engine took off flew around over headsup high down lowand landed gn trouble changed system RC56 repeated test Again no prob lems Thats typical test its result channels just use head Keep little distance between transmitters 20 ft .% sosticktotheAMARCFrequencyControl Plan keep receivers tune dont taxi QV THING FROM 72MHZ TO 73 MHZ 0SIGNALS SUMSMODULATEDSERIAL MOSTLY VHFAND DIFFRENCE455 MHZCONTROL -FREQUENCIESIFONLYPULSES ORIY SIGNALSTUNED RFMIXERAMPUFIEROETECTORDEMODULATOR OThER RCANTENNASECTION MS AI4D tAILIAI RAD DIFFERENSCONTROL PULSES TO INDIVIDUAL c0 q CALSERVOS OSCILLATORONE VERY PRECISE FREQUENCY block diagram depictS whats going RC receiver Theres lots additional explanation column 38 Model Aviation istho wasi pit area little monitoring testing necessary youll make out fine typical IF can transformer sifting metric scale Its cm George didnt notice slugs screw slot still filled beeswax until enlarged photo tuning screw slug visible through hole top can FREQLINCIES NOW AVAILABLE Academy Model Aeronautics pleased nounce sev eral years coor dination activities S Sbetween its RC Frequency Com mittee VHF/UHF Advisory Committee American Radio Relay League ARRL have re suIted agreement new set RC frequencies set aside RC oper ations amateur six-meter band new frequencies immediately available use RCers hold valid FCC Amateur Radio License Technician Class higher Specifically 200 kHz sub-band ex tending 50800 MHz 51000 MHz has designated RC use new ARRL Six-Meter Band Plan just ap proved ARRL Board Directors RC sub-band has further sub divided 10 RC channels Nos 00 09 using 20 kHz spacing between channels Note 20 kHz channel spacing identical spacing new 72 MHz frequencies cause BC equipment yet generally available will safely operate such closely-spaced adjacent channels AMA Six-Meter Phase-In Plan similar 72 MHz Phase-In Plan will effect next eight years plan see box calls use five even-numbered channels during phase-in period thus providing 40 kHz channel separation during timea separation clearly within capabilities equipment currently available amateur-licensed RCers long accustomed operating 53 MHz frequencies AMA hastens re assure continued use frequencies remains perfectly legal frequencies will continue accepted entry AMAsanctioned events However sixmeter RCers should understand background original AMA uni lateral adoption 53 MHz frequen cies RC use developments since time amateur commu nications world have begun cause increasing problems frequencies certain parts countryproblems will lieve inevitably lead gradual shift new frequencies six-meter RC fliers over next five eight years AMA firmly believes mutual recognition new 50800-51000 MHz RC sub-band both AMA ARRL marks major step forward six-meter affairs pro viding what promises relatively interference-free home six-meter fliers indefinite future AMA extend appreciation counterparts ARRL fine spirit cooperation assistance bringing action successful con clusion As usual matters sort much detailed time-consuming effort required part AMA RC Frequency Committee members primarily involved coordi nation activities ARRL Special credit goes former committee member Dick Jansson WD4FAB served principal coordinator former committee chairman Bob Aberle W2QPP played key role orga nizing effort AMAs licensed amateur RC fliers action another example ongoing efforts organization lead way improving aspects mutual hobby AMA also lieves action will benefit RC dustry urges equipment manufac turers seriously consider offering newest lines equipment new 50 MHz Phase-In channels numbers subtract rest 72400 72870 must get 470 first figure attempt make mixing product receiver 455 aware fact electrical signal IF amplifier broad enough 470 can world presented antenna get through cause interference receiver has seek out respond other hand IF properly tuned will transmitters weak little signal reject interference thats exactly consider TV signal goes out what happened Another bugaboo put thousands watts RC trans MHZ BLACK____ WHITE YELLOW*\FREQUENCY RESULT HZ 1/2nd-ORDERIM ISE TUNING two ways tune typical RC receiver right way L stagger tUned RI will allow certain types interference get system Follow Georges procedure tuning receiver avoid stagger tuning though receiver will still work mitter puts out about /2 watt see what job receiver antenna cut specific length usually meter Thus responds best VHF signals length antenna therefore performs first bit filtering tuned RF section fed mostly VHF signals antenna As conse quence way tuned TRF seeContinued page 145 / //4 /$d\\ STAGGER TUNING August 1983 39 AMA painted flat Pactra Formula U covered fuselage silk gets around compound curves easily weight adds negligible fuse lage given four coats nitrate dope final finish light coat Formula U olive drab followed light coat camouflage flat tan Before painting wiped MonoKote areas acetone remove oil dirt Decals produced Dave Platt Models very close proper size model Control rods used Suliivan Gold-NRod cable type lightweight flexible can easily positioned through fuselage bulkheads cable system moving elevator rudder makes very neat installa tion like attach cable servo arms either Du-Bro Gold berg easy connectors rig con trols setup need loosen screw connector move cable fore aft get desired result Flying Did get everything lined-up properly wing tips have cor rect amount washout Are control attachment points secure Are wheels tight Dont laugh Ive seen new ship leave wheel roll ing down runway lifted off cause pre-flight check overlooked takes small item destroy three four months work Check balance point should fall between 25% 30% wing chord Dont fly ship tail-heavy rearward balance point courting snap-roll disaster sure CC correct point model tested 13-in-dia 8-in-pitch prop did very well once trimmed out Later tried 12-8 13-incher seemed put out much thrust 530 sq wing area model handles 4-lb total weight ease During test flights motor battery closely watched bit concerned might heat up too much seems stay very cooL believe Hurricane would really perform new Cobalt motors Maybe Ill try later now Im having ball straight Astro 15 gear unit dont think will have regrets build ship took Hurri cane Valley Flyers Contest California stole show youre looking fun Scale project has great looks flyabiity SAFE FLYING IS NO ACCIDENT ************* *** ** WW***W * * * * WANDITTM * *Dealers Invited * * COn yOar warranty * ~J -K *CORD *Wet DryK * Stich AbrasivesK K *A Keen Machine' gives enceptionalK *sanding control encellent finish* * * 8995 Basic OcI 1 flat Wand 1 * ritsK *10895 Builder Special mcI 2 fIat 1 half * ano wand 5 6 grtsK *12995 Delver includes 3 flar 2 halfK * nd wauds buff wanos andK -K * 6 grits * *Addtional Wands Abrasves ava ableK * e local hobby shopK *K *80015 ELMORE Eoe No 1214 288 5780K * P 0 Box 266 uite Texas 75149K K KKKKKKKKKK*K Radio Technique/Myers Continued page 39 tion selectively amplifies signals between 72 73 MHz rest gives us second stage filtering Meanwhile crystal-controlled oscillator LO receiver running fre quency precisely 455 MHz above transmitters frequency oscil lators voltage frequency injected mixer along amplified RE voltages IRE section mixer frequency present mixed other frequency present including local oscillator mixing new fre Continued page 148 August 1983 145 INTRODUCING THE NEW FOX 36 RC Schneurle Ported Ball Bearing Main BRAND NEW 36 RC.evolved highly successful Combat Special took highly successful Fox Combat Special fitted new MarkXtype carburetor made porting head modifications get run idle well no-nitro fuel Result.the powerful 36 RC market new Fox 36 RC combines power superb idling characteristics light weight.and delivers lowest cost fuels 23900 Fox 36 RO$5995 90236 TiltUp Muffler1495 90237 Tilt-Down Muffler1495 F 0 X MANUFACTURING Co 5305 TDWSON AVEFORT SMITH ARK 72901 Hot Line SOif 686-1656 IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CID QUADRA$10950 Req 22 QUADRA $10450 Brisighelle Flywheel 012450 Req 22 QUADRA POWER ASSEMBLY ONLY 86450 QUADRA REPAIR 1000 pIes pews Jim Mesner ERCOUPEPLANS 82395 KIT $23995 Jim Messe TOMAHAWKPLANS $2395 KIT $25995 Jinx Messe 9-BALL TRAINER PLANS $1695 KIT $9995 BALSA end BASSWOOD fell siesI 35% OFF Connept FLEET PLANS $2995 KIT $15995 COWL $1995 P6W RADIAL ENGINES tar Fleet $2495 VICKERS LEWIS MACHINE GUN KITS $1495 CECONITE Podunts 10% OFF Siq J3 CUB KIT $12495 PLANS SUPER STEARMAN IGedfreyl $2095 STARDUSTER TOO IBrisighellel J3 CUB NeIit $2995 VOLKSPLANE IChinken Cherliel $2395 COCKPIT KITS Tonehewk F4U-1 Spitfire $2295 Ernoepe $2095 Steernien 82295 Citebrie $2495 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Ocedre FUEL TANKSlOne $695 32 en $795 FIBERGLASS ARROW SHAFTS 511$ s 32 long 61$1l1110 24-Hour 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Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 VelleY View Dr Allegeny NY 14706 AU NEW cusro SCNNEURLE cox 009 ENGINES Racing & Stunt versions special hard chrome & honing technology Also Complete inventory individual stock custom parts Cox TD 020 049 051 & 09 engines Competition parts & accessories Combat Free Fit C/L & A/C Racing Speed Stunt & Team Race Exclusive distributor Nelson 15 engIne & parts detailed catalog send 50 cents Kustom Kraftsmanshlp Box 2699 Laguna Hills CA 92653 Telephone 714 830-5162 Dynathrusts composite construction provides Unequaled Durability Saves money 100% accurate pitch results Outstanding Performance Air Counts s7OO slOO0 $1400 15x 6 18x 6- 8- 10 20x 6-8 10 _____22x 810180O Prices rclsde UPS charges LII MASTER CHARGE []VISA E]COD []CHECK []MONEY ORDER Dealers / Distributors invited THRUST PROPS ING 2541 NE lith Court Pompano Beah FL 33062 1305941 9119 Radio Technique/Myers Contmnoed oae 145 quencieS formed both sums differences originals strength mixing products depends voltages inputs frequen cies presented IF amplifier IF intermediate frequency amplifier very special kind amplifier frequency-sensitive will amplify 455 MHz Everything else rejected IF strip tuned properly Thus IF strip provides third stage filtering Please take word 455 MHz coming out IF strip carries con trol information detector strips formation out 455 MHz blocks 455 MHz voltage traveling fur ther presents control pulses decoder serial form like string box- cars decoder uncouples boxcars sending its proper servo its unique control pulse decoder provides serial-to-parallel sorting function also prunes away whatever trash may have gotten past detector providing final filter brief description should see keeping IF strip tune critically important typical IF strip holds three IF transformers little metal can about x 6 usually fitted screw inside colored black white yellow screw made compressed metal powder should too much tuning will wear edges off threads result screw wont hold adjustment Re-tune receiver necessary tune IF transformer Turn system send out someone transmitter having antenna collapsed have him walk limits control stop await instruction 2 take Ace RC 60K27 tuning wand sharpened hardwood stick rotate tuning screw turn clockwise /2 turn counter clockwise noting positions control lost Leave screw its middle position customary adjust IF transformers order yellow white blackDo three screws 3 Send friend transmitter out limit control again should further outtune again 4 Repeat till youve got maximum range helps friend keeps cycling control sticks back forth know control lost/regained Finish job dripping little melted beeswax screw keep place get beeswax sewing goods store Dritz No 623 peg-board Roll piece strip like matchstick heat sol dering iron drip drip drip e may wonder IF must ad justable precise answer lies fact crystals have real variation absolute frequency law allowed tolerance 0025% works out cycles per second 72960 MHz 835 cycles per second LO WHY SETTLE FOR LESS can have PerformaflCCOflomY 148 Model Aviation Engines Radios Mufflers Custom Carburators Gyros SUPER MINI-BOY VIDEO MINIATURE AIRCRAFT SUPPLY BRINGS YOU ANOTHER HELICOPTER FIRST Professionally produced video takes workshop professionally build set up flight trim mini-boy Includes step step building parts iden tification mechanical operational walk through radio installation balancing bench setup operational flight trimming aerobatics video better having someone else build Mini-Boy Video produced Mike Mas National Helicopter Champion Available ary 1983 BETA VHS WE CAN SUPPLY ALL OF YOUR HELICOPTER NEEDS AT UNBEATABLE PRICESI Worlds Strongest Epoxy Glues Training Stands MIni-Boy Competition Pack Wide-Landing Gear Training Aids Float Kits Video Cassettes Helicopter Tools MOVE UP TO SCNLUTER S See Dealer Call MINIATURE AIRCRAFT SUPPLY 2594 North Orange Blossom Trail ndo FL 32804 e 305 422-1531 crystals frequency 73415 MHz Thus difference between transmitters crystal receivers local oscillator crystal may anything 458659 451341 cps order pick up trans mitters signal IF has adjustable over same range Actually manu facturer will have lot crystals choose have right expect variation crystal will matchcd similar variation other re sult difference will very close nominal 455 MI-lz Ive talking about previous paragraphs same time should see reluctance some people accept idea interchangeable crystals comes might have pair crystals end range break replace another crystal having same nom inal frequency actually other end tolerance band thereby end ing up system out alignment 36% 3659 cycles out bandwidth 10000 reason specifying beeswax stays soft permitting easy removal later Candle wax sealing wax gets harder Youll probably notice other coils transformers PC board usually close August 1983 149 ORDER YOUR VIDEO NOW 5 Plus Shipping Ace AC Silver Seven receiver typical modern RC receiver George has delineated three IF cans us Most RC receivers service have similar appearance though parts may arranged different manner Krafts forthcoming 1991 Receiver shown Weak Signals show Toledo 1983 true 10 kHz narrow-band receiver dual-conversion FM signals present receivers AM block middle marked 7A N crystal filterreplaces 455 MHz IF cans used other receivers adjustable component adjustable IF cans 107 MHz IF stripwhich makes tuning pretty easy Kraft didnt quote price George knows wont cheapyet much new plane worth antenna TRF section rarely need retuning Leave alone waste lot time Some receivers dual-conversion types easily identified presence extra crystal usually 11155 MHz extra IF transformers Tuning done same way before except 107 MHz IF strip first may have trouble identifying IF transformers besides dual-conversion tuning itself pain head Most folks prefer leave professionals have proper equipment make job easier Ive included couple examples will know what am discussing own judge whether want take job Transmitters need occasional tuning dont wont have proper tools control harmonic emissions Besides Federal Law requires transmitter tuning done holders Commercial license Send back manufac turer George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 FF Old-Timers/Haught Continued page 59 problem surfacedthat softening ni trate finishes alcohol-based fuels Early solutions varnish-based hot fuel proofers created weight patch ing problems Butyrate dopes apparent solu tion modelers problems does have major disadvantage never quits shrinkine Eve observed full-size aircraft fu selage stringers flying surface trailing edges hopelessly warped distorted ravages butvrate dope variation known non-tautenine CAB exists readily available through model supply houses now youve probably concluded nitrate dope way go OldTimers powercd ignition engines Now comes question applicationto brush spray Spraying gives smoothest finish brushing good camel-hair brush will give acceptable results Initial coats least two should brushed lncoqporated 322 Sa Gallatin Rd son TN 37115 615 868-6811Mon thru Sat am 500 pm SALES ______________________ RADIO SYSTEMS FUTABA ROYAL ACCESSORIES FOR MOST RADIOS IlI Ill -- insure good bond covering Use brush tissue silkspan silk try new foam brushes flow dope Using brush silk allows dope work through cloth run down back side causing ugly blisters known cure blisters cut out apply patch Thin dope enough work undue brushing thin coats will take seal covering Spraying will re quire thinner coats Separate thinners available nitrate butyrate dope use just thinner both automotive acrylic lacquer thinner Get best three grades available Too much thinning either brush spray appli cations leads runs use sparingly spraying dope too thick finish will have orange peel effect Add thinner and/or hold spray gun far ther surface minimize effect As previously mentioned apply enough dope seal covering airtight fuelproof Build up finish clear dope add pigmented dope color desired Clear dope over colored covering works great lightweight applying color dope over clear sometimes small pin holes show up indicating covering sufficiently sealed Add clear dope try again common dope troubles blushing indicated milky film appearing surface dope dries phenomenon caused rapid evaporation highly-volatile mate rial cooling action will cause moisture condense surface freshly-applied dope resulting milky appearance Blushed dope has no gloss remedy blushing slow drying process addition 5% retarder added thinner used Retarder available automotive paint supply houses will have buy gallon Better try small amount auto body repair shop take own can retarder avail able try postponing doping until less humid day Dopes available retail hobby out lets sometimes nitrate dopes stocked may have ordered Local Fine Quality flying Models 98 RUBBER POWER KITS plus Gliders C/L RIC AccessOriCS Books Catatog 3150 4 8 4 4 * MAJESTIC MODELS 3273 West 129th Street Cleveland Ohio 44111 150 Model Aviation Magic Dragon Trainer Engine Size 25Pre Built Wing Span 55 in$9995 3 4 ChannelsPlus shipping Lives Up Toand handling Its Name__MAGIC! balsa construction Ready fine sand cover Control surfaces hinged HalIco landing gear u nose gear strut Fitted canopy Instruction booklet hardware included Fire Fox Ultimate Sport FlyingPre Built Engine Size 40$12495 Wing Span 52h inPlu shipping handling 4 Channels balsa construction Ready fine sand cover Control surfaces hinged Has bolton wire HalIco landing gear wheel pants mounted axels installed Fitted canopy Instruction booklet hardware included Designers Builders Fine PRE-BUIL T R/C Models Order Today Send check MO also accept Master Card VisaModels shipped 350 PSI carton via UPS Shipping handling $850 Fl residents add 5% sales tax AEROTECH R/C 3850 US Hwy 19 No. Palm Harbor FL 33563 81319383266 have SIX other models available Send Now free brochure Dealer Inquiries Invited REPAIR SERVICE FOR HOBBY LOBBY EK LOGICTROL FUTABA T HOBBY SNACK rROYAL LINE ATTENTION QUARTER & GIANT SCALE MQDELERS LLITSAP need iti LLIT-SAP multiple servo LONG LEAD INTERFERENCE TRAP & SERVO ALTERNATE POWER adap tor Specify radio ordering $2995 postage paid send large SSAE for literature