RF Sniffer

If transmitter has left sniffers tone will let know People often comment things simpler good old days certainly true modem RC transmitters too years ago transmitters utilized AM Amplitude Modulation did provide bells-and-whistles now take granted Most new radio systems now have transmitters employ FM Frequency Modulation offer features includes systems called FIVI PCM PPM think would agree simple older systems much better number years ago circuit published RF sniffer George Steiner believe basically diode detector circuit its output applied input Radio Shack audio amplifier combination placed near operating RC transmitter speaker would emit loud buzz buzz detected AM modulation made several RF sniffers club has used number years club transmitter impound served us well club sponsors KRC Electric Fly major event Electric-powered model aircraft enthusiasts 1996 almost 300 transmitters impound area used two sniffers table incoming transmitters come used sweep transmitter racks tables periodically sure no switches accidentally bumped during handling During last few years have seen increase number FM PCM radio systems being used also noticed RF sniffers did detect new systems very well almost touch new transmitters sniffer antenna buzz emitted speaker barely audible reason sniffer designed detect AM modulation no AM modulation detect decided time new RF sniffer designone would detect transmitter type modulation equally wellan RF sniffer would take us 21st century call RF Sniffer 2100 Circuit Description schematic shown Fig 1 Qi its associated components Rl R2 R4 R5 Cl C4 form broad band RF amplifier approximately 10 dB gain output amplifier coupled biased Schottky diode AM detector circuit thru high pass RF filter comprised C3 Li C5 combination RF amplifier low pass filter provide RF front end amplification below 20 MHz above 100 MHz Resistor R9 supplies trickle DC bias current thru detector diodes Dl D2 increase sensitivity low level RF Continued page 65 62 Model Aviation y use plugged modified Radio Shack audio amplifier Text has sources components RF Snifter unit complete less amplifier Antenna ten-inch piece 025 music wire PC board Radio Shack amplifier shows modification required using jumper wires maintain battery connection Figure 2 Overall view shows parts placement Sniffer detects model aviation frequencies U John Hickey 109 25 OOPSSOIOIACTSI ICD4049 402 09ERTU9G BUFPER 7K 10 V 11w 12 14IS PIG SOIlSO999955P9911r2100 Figure 1 Figure 3 27 09S OUTPUT h# 499 DllFI 190IOIACT ber 1997 63 196 inches i-i 12 Inches TI 0 0975 inches between centers Approx 075 Inches FIg 2 Pans P4aoutdgos9S 059 ho9lngm gIdeSo 0999 P1 9Sd P2 RF SnifferlNickey Continued page 62 signals germanium detector diodes used original sniffer type 1N34A still available Radio Shack can subsituted Schottky diodes specified circuit powers amplifier completes new design Integrated circuit Ul contains six CMOS inverting buffers Sections b together R6 R7 C7 connected form square wave oscillator component values cause oscillate approximately 3 kllz audio frequency often used alarm sound hard ignore 3 kHz square wave drives remaining four sections integrated circuit wired parallel provide power driver switches amplifier circuit off 3 ld{z rate has effect chopping AM modulating RF signal comes thru amplifier circuit 3 kHz rate Thus FM signals arriving amplifier have AM modulation added before fed AM detector circuit high pass filter output amplifier attenuates 3 kHz modulation signal over 100 dB modulation signal itself does come out detector unless actually derived RF signal coming thru amplifier R3 C2 integrate square wave have effect softening rise fall square wave driving amplifier minimizes 3 kHz transients Ql switched off R8 C8 filter 9 VDC line prevent 3 kHz signal getting back audio amplifier thru DC line RF Sniffer packaged small plastic enclosure conveniently plugs right side Radio Shack amplifier audio output detector connected input Radio Shack audio amplifier ninevolt DC power sniffer supplied nine-volt DC connector Radio Shack amplifier Getting 9 VDC out power jack amplifier having controlled switch volume control requires slight modification amplifier will discuss later selling price about $12 Radio Shack audio amplifier still least-expensive ways get portable audio amplifier built-in speaker power source Note newer versions Radio Shack Amplifier can used old versions did have DC power jack Construction unit shown built printed circuit board have built unit using Radio Shack perforated universal printed circuit board easy task choose go route try use similar layout make ground runs wide similar PC board ease assembly reliable operation PC board recommended good old days electronic parts MW III SLTMPOU IbmuiI Yquw Id IT 7 aiting new WE K&B paint line Its worth wait K&B SuperPoxy best paint industry knew going challenge repeat success SuperPoxy ULTRAPOXY has done will see what mean try ULTRAPOXY exceeds expectations anticipated new paint line ULTRAPOXY has same strong durable fuel proof finish SuperPoxy best has clear coat already finish has deep high gloss unmatched other paint Better yet two part epoxy paint requires no thinner coverage exceptional spray light dust coat followed final flow coat youre done finish looks like youve spent hours wet sanding painting youre sure get comments wondering got such fantastic finish ULTRAPOXY comes standard base colors match colors popular heat shrink coverings So now its easy match painted parts rest film-covered parts model Additionally satin catalyst available wishing silkier finish ULTRAPOXY available local hobby dealer still have some SuperPoxy paint left over K&B hasnt forgotten Catalyst thinner will still available period time ULTRAPOXY K&B keeping promise providing quality modeling products model enthusiast K& het4r its Field Siwe 194f 520045303579/520045303583 t 2100 College Dr Lake Havasu Cliv Arizona 86403 E marl k&b@Inknet corn October 1997 65 INC OR P0 RATED WORLDS LARGEST MANUFACTURER OF SUPERIOR EPOXY-GLASS COWLS WHEEL PANTS & ACCESSORIES IIIIII D CALL NOW 810 677-0213 FAX 810 677-0414 orders Send $100 CaOpen $2 00 CanadaMonday Friday II ii I$3000utaideofUSA lOam4pmEST Sky Karbor RO Presents Mike Del Pontes Reviution V-Tail Q-500 Fits 40 size motors Pilots choice NATs four years running Holds numerous 0-500 Pylon records Standard equipment top pilots like Chip Hyde Richard Verano Mark Parker & Tony Lopez Hand crafted custom built ARF Light weight pre-built fuselage piece sheeted wing epoxy carbon fiber reinforcing hand select weigh piece balsa ensure 35 lbs airplane Predictable racing plane yet stable docile sport plane Proven race winning building set up details included $13500 ping Modified p-5l Series True Scale Outline ou size a & riywooo uonstrucrion ize aesignes ror rJeison ueo oesigneo YS 91 YS 140 Wing Cores r Canopy plus ABS cowl Scoop Exhaust Build Kit ARE Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Ruciog Association Champion MASIER AIRSCREW 3-Blade Series Propellers Now sizes 11x8$895 12x6995 13x81095 sizes come Availlable local hobby dealer Send SASE catalog Windsor Propeller Co Inc 3219 Monler Circle Rancho Cordova CA 95742 Ph 9166318385 Fax 9166318386 email 726731 lO@compuservecom easier buy local electronics stores Nowadays areas have Radio Shack stores handy carry types parts number good mailorder supply houses such favorite Digi-Key often have buy parts multiples five 10 often have miminum-order policy RF Sniffer really useful device want make easy average modeler obtain have found local company willing supply necessary parts An etched-and-drilled PC board complete kit parts available supplier listed dont feel comfortable soldering small components enlist help local electronics experts club built tested unit also available source listed Please note kit includes parts RF Sniffer Radio Shack amplifier will modify Radio Shack amplifiers sell new modified amplifier handled separately See details end parts list electronics enthusiast have parts list available Digi-Key part numbers also Radio Shack part numbers available copy send SASE John Hickey 1624 Maple Ave Hatfield PA 19440 Refer parts-placement diagram shown Fig 3 assembling circuit installing parts PC board recommend bending leads over circuit side board Cut short before soldering make sure will short adjacent circuit run Begin mounting resistors PC board install two jumper wires near Ul use discarded resistor leads jumpers Next install capacitors Cl thru C9 being careful observe correct polarity inserting C8 Capacitor C9 installed vertically its leads goes down PC board soldered other lead stands vertically away PC board lead will later soldered center pin P1 Install Dl D2 Ql Ul Orient parts shown remember banded end Dl D2 cathode indicated bar diode symbol housing used available Radio Shack cat no 270-288 held together single screw back side Modifications Sniffer housings easy Screw together tightly wrap several layers tape lengthwise around housing hold halves together securely drilling holes P1 P2 Note following hole diameters proper sizes Radio Shack versions plugs use another source verify correct hole sizes Locate drill 15/64 diameter hole 75 inch up bottom right-hand corner center seam side housing Sky Harbar RC Phoenix AZ USA 976-6341 wwwinficadcoml-skyharrc Dennis & Dorinda ThomasZ Fre8 Color Brochure Spring 97 Release Great Scale Look Superior Performance NASA Airfoils Greater Thrust Lower RPMs Accurately Balanced DC connector P2 Carefully measure up 975 inches P2 hole drill 1 1A2 diameter hole audio output connector P1also side seam housing P1 P2 spacing required plug Radio Shack amplifier have trouble accurately measuring 975 inches just locate inch apart elongate holes slightly Use Radio Shack amplifier jacks guide spacing Place PC board housing mark location antenna will exit housing hole will below seam housing should allow antenna wire lay flush PC board Use 1A2 diameter drill drill exit hole antenna Using parts placement diagram Fig 3 guide cut side terminals length P1 P2 P1 side terminal shorter center terminal longer P2 reversed side terminal longer Insert PC board housing trial-fit P1 P2 position side terminals will have bent down toward board will rest board plugs will level exit housing plugs mounted PC board wire jumpers soldered board P1 has two jumpers secures side terminal against board goes up over threaded portion plug Solder both jumpers P1 using mimimum heat prevent damaging plug Solder top lead C9 center terminal P1 P2 mounted similar fashion except jumper ground PC board goes up over center terminal short jumper connected side terminal PC board near R9 Make sure both P1 P2 have shoulders flush against housing come straight out housing antenna made ten-inch length 025 piano wire available local hobby shop Clean wire steel wool sandpaper will solder easily bend short right-angle Z bend end wire insert PC board near U 1 Orient wire near Cl shown solder rectangular pad circuit side PC board near Ul Solder short jumper wire antenna PC board Cl actual connection antenna RF sniffer circuit As mentioned earlier Radio Shack audio amplifier must modified feed 9 VDC out sniffer circuit Normally insert plug DC connector battery disconnectedjust opposite what want Two short jumper wires will soldered PC board amplifier correct problem feed 9 VDC out connector volume control switch turned Remove back amplifier Join squadron Brand new squadron markings. Available 1/8 1/6 & 1/4 scales hiL $400 fri 44 Cat0V & Co& Ckajt Theres always thing new major decals29 works.squadron insignias NORTHEAST SCREEN GRAPHICS P0 BOX 304 EAST LONGMEAOOW MA 01028 TEL 413 525-4110 PAX 413-525-7704 October1997 71 remove two screws hold PC board case Carefully fold board out housing obtain access backside PC board Using photograph Fig 4 guide solder two short jumper wires PC board DC connector Use connectors PC board guide identify correct area board allow solder short nearby circuit runs Again need help ask local electronics expert Carefully reinstall PC board housing modification will course void warrantybut $12 really want modify amplifier yourself can sent source listed modification nominal fee new modified amplifier can also ordered same source desire After amplifier modified like ever use amplifier battery eliminator pluged DC power connector would apply voltage directly battery may cause damage Checkout Feed RF sniffer antenna through hole housing insert whole PC board assembly housing Plug sniffer side audio amplifier turn volume control way up listen closely low-level 3 kHz tone can heard speaker normal operation volume control needs turned up about 1/3 its rotation 3 kHz tone noticeable Remember volume control does control RF Sniffer sensitivity adjusts audio level coming out speaker signal received Turn RC transmitter its antenna down bring near RF sniffer transmitter within 24-36 inches sniffer noticeable 3 kHz tone should start heard transmitter six inches sniffer tone will very loud transmitter antenna extended can typically detect 15-20 feet away transmitter uses AM modulation will also hear raspy buzz along 3 kHz tone Radio em rrrsesown Focus 2AM Single Stick 27112 MHz$6999$9995 Focus 4 FM$12899$29995 Focus 6 FM$15799$24995 Flash 4 FM$14099$23995 Flash 5 FM$16799$30495 Challenger 250 AM$5499$6795 Prism 7X FM$21999$38495 Prism lx PCM$23999$41995 Prism 7X FM SPECTRA$29399$50995 Prism 7X PCM SPECTRA$33499$58995 SPECTRA Modules$9999$16995 Prism 7X FM SPECTRA Trausmitler Char9er$19999$34995 Focus 4 Truesmilter charger$4999 Fecus 6 Transmitter sod charger$5499 HITEC RECEIVERS eceloer RCD Micra 535 w/stal$6999$9995 Supreme Ru w/sIaI$6299$9995 PCM Ru tar KiTes$9499$13495 Micro 5-ch 75 MHz$4799$695 2-ch 27 & 75 MHz$2999$3995 2-ch AM Os 27/72 MHz$2999$4495 50 & 75MHZ Crystals$799$1395 Shredder OX$3999$4995 ZENOAH ENGINES G23777777$25496 G-39$25999 G-45$33499 0-62$37999 SAITO ENGINES SumsSale PriceRetail HS-69 Super Micro 15 sz$3799$5495 HS-69 Soh Micro 31 or$2399$3995 H589MG Suh Micra$3799$5495 HS-8589 Super Mini Single SB 39 uz$3299$4995 H5191 Mini 24uz$2199$3195 HS191MG$3299$4595 H5295BB Micro 43os$2699$4195 HS-295MG$3799$5995 HS-225BB Super Mini Micro 59 oz $3299$4995 HS-389 SId Spurt 42 or$1899$1695 HS-422 Pro Serve 43 es$1299$1995 HS-425BB Pro Dual 88 43 or$1999$2995 HS-S2SBB High Speed 47 ez$3499$5995 KS 54588 Hi Tsrqae 62 05$3499$5995 H5685BB Ultra Torque 77 or$3699$5995 95485MG Ult Torque 77 or$4599$7495 HS-61SMG 89 11900$4599$7495 H5799BB Giant 133 es$2999$4495 HS-795MG Giant 166 az$4299$6495 HS7SBB Retract 90 or$3999$5995 HS-725B8 Sail Winch 161 or$4799$7395 HS-995BB 224 Oz$3999$7395 GY-199BB Ball Soaring Gyro$9999$13495 SERVO VALVE DEALS SwitchHarness Four HS-390Save $596$4599 Faur HS-422Save $696$5299 Three HS-1O1$6599 Three HS-80$7199 Three 95-28588 & 000 HS-80 Save $597$19499 Three HS-799 & HS-422$9999 HITEC NiCd BATTERIES Battery Sole PriceOutsit Os 490 270 mahSovo $1699$1995 Os 48o 698 mahSave $1499$1795 Os 480 1088 mahSano $2499$2995 Tx 96v 698 mah Pocuo Series $2999$8395 Recolour Nitd SUPER SALE Flat Square Hilec/JO Falaha J Airironico connectors 690 mah$1199 tour br $4499 999 mah$1499 leer tur $5590 cogineOslo miceineisii PA-SO Gslden Knight ABC$19995$33495 FA-56 Golden Knight ABC$29999$34995 FA-65 Golden Knight ABC$21995$36995 FA-80 Golden Koight ABC$23995$41495 iS Golden Koight MC$24995$47495[iitiudes Fou/iS306Srvoi70iiSiitciiiiamess70ii FA-1295 Golden Knight MC$37499$57995Supreme 7 ch Recoiver ysur chauuel choice 699 mah Rn FA-iSO Golden Knight MC$38495$63495Battery Availahle S eclams br $19999 FA-SO OC ABC$19495$30995tour HS-422 servos add $799 taur HS-425 servos add FA-SO 0/C ACt$16995$31999$3599 Isar HS-605 servos add $19509 FA-65 OC ABC$19495$33495WIRING ACCESSORIES IJ S erA Connectursl FA-OD OC ABC$21495ItemSale PriceRetail PA-giS OC ACt$224956 Estesoion$499 $595 FA-1285 OC ACt$3399512 Estessiss$499 $595 FA-iso OC ACC24 Estension$599 $695 0/C AIRMODEL lOelioured Prices36 Extension$699 $795 0-Shark ME II$294996 Boosl/Buffer Estension$999$1395 NEW laser 200$3249912 Bsost/Buller Estennion$999$1395 CAP 231$3999924 Boost/BolIer Extension$1899$1495 98 Lasor$2499936 Boost/Buffer Esteosion$1199$1595 68 G-Shsrk$179996 Y Connector$799$995 2100S ORIGINALS24 Y Connoctsr$999$1895 ____Cj6 BeootlBotI Y Connector$999$1595 ______________________________Switch Harness$799$1995 58 3-lead Servs Wire$1199$1495 SPECIAL lO% OFFNONSALE Troiser cord Fotaha Compal $1199$1495 ITEMS TO AMA MEMBERS SEPTEMBER FREEBIE 6 GoldbergMini-Snaps order over $7500 ORDER TOLL FREE 1-800-604-6229 info 608 241-3491 Fax 608 241-1313 n-Mull Addoso hobbyherso@hshhyharoocom Vs Os Wek 5 o wwwhohhyhsrsecem V us MasterCard Welcome VISAPr coo Good Through September 301997 Repairs Updates Custom Modifications Frequency Changes 6 Send Legal sized SAE 1997 Meter conversions ACE Airtronics Aristo-craft Cirrus EKCatalog containing lists RIC maintenance hints Futaba Hitec Heathkit Hobby Shack JR Kraft KGL KSE KlineDiscover MCard VISA COD KoPropo Pro-Line RCD Tower Hobbies World Engines & othersUPS USMAIL FEDEX etc Calibrated Equipment Quick Turnaround Walk-in daily service 8-00 am-S 00 pm Send E-Mail PTWaters@lunocom October 1997 73 HOBBJHORSE 1769 Thierer RoadMadison WI 53704 Li]HITEC SERVOS ~pY%u RIC SERVICE AT ITS BEST Sales Service Anything Radio Controlled KMI 7420 Seven Mile Rd Northville Michigan 48167 Ph 248-486-4800 Fax 248-486-1603 sniffer does work turn off recheck circuit side PC board unsoldered joints shorts Also compare parts placement assembly drawing verify orientation components After everything checks out remove sniffer audio amplifier Test-fit sniffer housing cover sure will close up correctly Remove cover holding PC board down housing carefully apply some five-minute epoxy around P1 P2 secure PC board lock housing allow epoxy get seal perimeter housing prevent eye injury bend small loop end antenna distort end somewhat glue small plastic bead antenna can obtain beads craft store just remove push-pin Application The RF Sniffer intended scanner sensitive receiver However does detect nearby RC channelsincluding 27 MHz Citizens Band 50 MHz RC ham frequencies 72 75 MHz RC channelsif close source transmission insensitivity design Sniffer too sensitive would pick up transmitters operation flightline latter supposed want detect unit proves too sensitive transmitter impound close flightline easiest way reduce sensitivity simply shorten Sniffer antenna about 6-8 inches length Another option omit bias detector diodes supplied R9 Just cut its leads leave other end connected PC board want restore normal 4-40x1/2 socket caps sell S435/1 000 aiioy steel S665/1 00 stainless S750/50 aluminum fair prices sensible quantities fas teners need model building call write fax free catalog Micro Fasteners800-892-6917 110 Hillcrest Road908-806-4050 Flemington NJ 08822fax 908-788-2601 emoiI microf@blastnet Internethftp//microfastenencom 74 Model Aviation ation later just resolder R9 lead back together Sniffers dont cost much cheap insurance against costly loss prized aircraft possible injury pilots spectators normal current drain amplifier battery about ten milliamps mA Because typical nine-volt alkaline battery has rating 400 mA-hours sniffer will operate almost 40 hours battery Does Sniffer have other uses bet ya Use test own transmitters antenna up down gives baseline its normal operation have trouble RC system future can verify transmitter putting out normal power Note does substitute normal range check complete system though RF Sniffer optimized operation 20-100 MHz will detect anything transmits get close enough will verify operating lot fun running around house checking out things like cordless telephone garage door opener transmitter cell phone much surprise microwave oven use Schottky diodes Happy sniffing Hickey 1624 Maple Ave Hatfield PA 19440 PARTS LIST FOR THE RF SNIFFER 2100 SEMICONDUCTORS DlD2-SD1O1ACT Schottky barrier rectifier Q1-2N3904 NPN transistor U1-CD4O49UBE hex inverting buffer CMOS integrated circuit RESISTORS resistors 1/8 watt 5% carbon Only Made USA guts can make best 8 channel receiver market THE BLADE CUTTING EDGE ALL-NEW MADE IN USA MIcROcHIP DESIGN FEATURES FUlRasSumuIElssgllhaujaU Thecoheroerks aSh oil pormim FM DIRECT SIMS CONI5U iSO Alksa sewn tenohon ssSi DAD0 05C cor0r boo o DSC osypynd tononrbror FN 85515 INI1RCUUUSU 4-cur CEU cornecton fit AirtnOo Fodo J JR Hint AD sawn 4-sos HIGIEST 85515 SIGNIL MINT Digital pncesso sen1s IDO-% manner sewn siand at-er eceners 5wm4sw gem mmse Digital processor Iodu Tr cantod frores ha citlosa sewn posiraglirdr resistonin E1 1] p EU 1 ]d Ie{U IdgUad*I~ Torque taM5 Burnings @4Si @48e LaWaK Weight PI%Id Imsflilfe lCtfSn 2CSe 2301123 355. Pro tonlSiIfe 4415. 2CC. tAI7511A 175. P, PlUS IfSitite IffS. 2CC t817SC1A US. $2050 td5 lnfiIil tWIG. 2CC UXISSSA LII. IronfSiSt WIG. USe. XS2Ct1 770. Tot rstwin IriS. us uxISlie 16G. $3955 tFrdhS.Sqdl ~rn~ejWHdjGminuh.Ce. s.I~&sAeStje&dp FinttFS.& Still Only $7995, Made USA Specifications 3L t255 125111 Cs WI HlItflIepaCt NylCe W Case SIflsillYity 4 iCrg-tSIts miles re air rMt Mrs initaCeb 108Cc Cerot Oral otS uilllaups 13 apPrened Limited Litutim Wmuty Crystal lntrchaCea4lrn Diogroms side labels illustrate hors properly plug brando4 compatible battery serco connectors $5465 Complete DAD 1 2VIC CVC-type AC wall charger field kit Power Indicator team up assure flawless field kit battery performance teat roost hove ninety RiCer field kit finally coroplere mith system Always knot hors maci charge left starter battery flying field guess mark thing poor neon again over charge DAD0 charger Power Indicator team ossums fall charge oil times http//usersaolcom/DAflHOF. Ordering & Bealer 8494 Cottagewood Terr MN 55432lisqitires 0011 Technical Questions Phone/Fax 612 717-29191 806 6694548 order kits call 1-800-327-7198 e catalog fine kits send $400 Idaho Residents Add 5% State Sates Tax October 1997 75 UNIVERSAL I! iirrr rs ii rs O45J ssa iE [11 iii IKON offers largest selection giant scale kits world GiAN UALL UALt bU 1/4 SUAL 3b

If transmitter has left sniffers tone will let know People often comment things simpler good old days certainly true modem RC transmitters too years ago transmitters utilized AM Amplitude Modulation did provide bells-and-whistles now take granted Most new radio systems now have transmitters employ FM Frequency Modulation offer features includes systems called FIVI PCM PPM think would agree simple older systems much better number years ago circuit published RF sniffer George Steiner believe basically diode detector circuit its output applied input Radio Shack audio amplifier combination placed near operating RC transmitter speaker would emit loud buzz buzz detected AM modulation made several RF sniffers club has used number years club transmitter impound served us well club sponsors KRC Electric Fly major event Electric-powered model aircraft enthusiasts 1996 almost 300 transmitters impound area used two sniffers table incoming transmitters come used sweep transmitter racks tables periodically sure no switches accidentally bumped during handling During last few years have seen increase number FM PCM radio systems being used also noticed RF sniffers did detect new systems very well almost touch new transmitters sniffer antenna buzz emitted speaker barely audible reason sniffer designed detect AM modulation no AM modulation detect decided time new RF sniffer designone would detect transmitter type modulation equally wellan RF sniffer would take us 21st century call RF Sniffer 2100 Circuit Description schematic shown Fig 1 Qi its associated components Rl R2 R4 R5 Cl C4 form broad band RF amplifier approximately 10 dB gain output amplifier coupled biased Schottky diode AM detector circuit thru high pass RF filter comprised C3 Li C5 combination RF amplifier low pass filter provide RF front end amplification below 20 MHz above 100 MHz Resistor R9 supplies trickle DC bias current thru detector diodes Dl D2 increase sensitivity low level RF Continued page 65 62 Model Aviation y use plugged modified Radio Shack audio amplifier Text has sources components RF Snifter unit complete less amplifier Antenna ten-inch piece 025 music wire PC board Radio Shack amplifier shows modification required using jumper wires maintain battery connection Figure 2 Overall view shows parts placement Sniffer detects model aviation frequencies U John Hickey 109 25 OOPSSOIOIACTSI ICD4049 402 09ERTU9G BUFPER 7K 10 V 11w 12 14IS PIG SOIlSO999955P9911r2100 Figure 1 Figure 3 27 09S OUTPUT h# 499 DllFI 190IOIACT ber 1997 63 196 inches i-i 12 Inches TI 0 0975 inches between centers Approx 075 Inches FIg 2 Pans P4aoutdgos9S 059 ho9lngm gIdeSo 0999 P1 9Sd P2 RF SnifferlNickey Continued page 62 signals germanium detector diodes used original sniffer type 1N34A still available Radio Shack can subsituted Schottky diodes specified circuit powers amplifier completes new design Integrated circuit Ul contains six CMOS inverting buffers Sections b together R6 R7 C7 connected form square wave oscillator component values cause oscillate approximately 3 kllz audio frequency often used alarm sound hard ignore 3 kHz square wave drives remaining four sections integrated circuit wired parallel provide power driver switches amplifier circuit off 3 ld{z rate has effect chopping AM modulating RF signal comes thru amplifier circuit 3 kHz rate Thus FM signals arriving amplifier have AM modulation added before fed AM detector circuit high pass filter output amplifier attenuates 3 kHz modulation signal over 100 dB modulation signal itself does come out detector unless actually derived RF signal coming thru amplifier R3 C2 integrate square wave have effect softening rise fall square wave driving amplifier minimizes 3 kHz transients Ql switched off R8 C8 filter 9 VDC line prevent 3 kHz signal getting back audio amplifier thru DC line RF Sniffer packaged small plastic enclosure conveniently plugs right side Radio Shack amplifier audio output detector connected input Radio Shack audio amplifier ninevolt DC power sniffer supplied nine-volt DC connector Radio Shack amplifier Getting 9 VDC out power jack amplifier having controlled switch volume control requires slight modification amplifier will discuss later selling price about $12 Radio Shack audio amplifier still least-expensive ways get portable audio amplifier built-in speaker power source Note newer versions Radio Shack Amplifier can used old versions did have DC power jack Construction unit shown built printed circuit board have built unit using Radio Shack perforated universal printed circuit board easy task choose go route try use similar layout make ground runs wide similar PC board ease assembly reliable operation PC board recommended good old days electronic parts MW III SLTMPOU IbmuiI Yquw Id IT 7 aiting new WE K&B paint line Its worth wait K&B SuperPoxy best paint industry knew going challenge repeat success SuperPoxy ULTRAPOXY has done will see what mean try ULTRAPOXY exceeds expectations anticipated new paint line ULTRAPOXY has same strong durable fuel proof finish SuperPoxy best has clear coat already finish has deep high gloss unmatched other paint Better yet two part epoxy paint requires no thinner coverage exceptional spray light dust coat followed final flow coat youre done finish looks like youve spent hours wet sanding painting youre sure get comments wondering got such fantastic finish ULTRAPOXY comes standard base colors match colors popular heat shrink coverings So now its easy match painted parts rest film-covered parts model Additionally satin catalyst available wishing silkier finish ULTRAPOXY available local hobby dealer still have some SuperPoxy paint left over K&B hasnt forgotten Catalyst thinner will still available period time ULTRAPOXY K&B keeping promise providing quality modeling products model enthusiast K& het4r its Field Siwe 194f 520045303579/520045303583 t 2100 College Dr Lake Havasu Cliv Arizona 86403 E marl k&b@Inknet corn October 1997 65 INC OR P0 RATED WORLDS LARGEST MANUFACTURER OF SUPERIOR EPOXY-GLASS COWLS WHEEL PANTS & ACCESSORIES IIIIII D CALL NOW 810 677-0213 FAX 810 677-0414 orders Send $100 CaOpen $2 00 CanadaMonday Friday II ii I$3000utaideofUSA lOam4pmEST Sky Karbor RO Presents Mike Del Pontes Reviution V-Tail Q-500 Fits 40 size motors Pilots choice NATs four years running Holds numerous 0-500 Pylon records Standard equipment top pilots like Chip Hyde Richard Verano Mark Parker & Tony Lopez Hand crafted custom built ARF Light weight pre-built fuselage piece sheeted wing epoxy carbon fiber reinforcing hand select weigh piece balsa ensure 35 lbs airplane Predictable racing plane yet stable docile sport plane Proven race winning building set up details included $13500 ping Modified p-5l Series True Scale Outline ou size a & riywooo uonstrucrion ize aesignes ror rJeison ueo oesigneo YS 91 YS 140 Wing Cores r Canopy plus ABS cowl Scoop Exhaust Build Kit ARE Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Ruciog Association Champion MASIER AIRSCREW 3-Blade Series Propellers Now sizes 11x8$895 12x6995 13x81095 sizes come Availlable local hobby dealer Send SASE catalog Windsor Propeller Co Inc 3219 Monler Circle Rancho Cordova CA 95742 Ph 9166318385 Fax 9166318386 email 726731 lO@compuservecom easier buy local electronics stores Nowadays areas have Radio Shack stores handy carry types parts number good mailorder supply houses such favorite Digi-Key often have buy parts multiples five 10 often have miminum-order policy RF Sniffer really useful device want make easy average modeler obtain have found local company willing supply necessary parts An etched-and-drilled PC board complete kit parts available supplier listed dont feel comfortable soldering small components enlist help local electronics experts club built tested unit also available source listed Please note kit includes parts RF Sniffer Radio Shack amplifier will modify Radio Shack amplifiers sell new modified amplifier handled separately See details end parts list electronics enthusiast have parts list available Digi-Key part numbers also Radio Shack part numbers available copy send SASE John Hickey 1624 Maple Ave Hatfield PA 19440 Refer parts-placement diagram shown Fig 3 assembling circuit installing parts PC board recommend bending leads over circuit side board Cut short before soldering make sure will short adjacent circuit run Begin mounting resistors PC board install two jumper wires near Ul use discarded resistor leads jumpers Next install capacitors Cl thru C9 being careful observe correct polarity inserting C8 Capacitor C9 installed vertically its leads goes down PC board soldered other lead stands vertically away PC board lead will later soldered center pin P1 Install Dl D2 Ql Ul Orient parts shown remember banded end Dl D2 cathode indicated bar diode symbol housing used available Radio Shack cat no 270-288 held together single screw back side Modifications Sniffer housings easy Screw together tightly wrap several layers tape lengthwise around housing hold halves together securely drilling holes P1 P2 Note following hole diameters proper sizes Radio Shack versions plugs use another source verify correct hole sizes Locate drill 15/64 diameter hole 75 inch up bottom right-hand corner center seam side housing Sky Harbar RC Phoenix AZ USA 976-6341 wwwinficadcoml-skyharrc Dennis & Dorinda ThomasZ Fre8 Color Brochure Spring 97 Release Great Scale Look Superior Performance NASA Airfoils Greater Thrust Lower RPMs Accurately Balanced DC connector P2 Carefully measure up 975 inches P2 hole drill 1 1A2 diameter hole audio output connector P1also side seam housing P1 P2 spacing required plug Radio Shack amplifier have trouble accurately measuring 975 inches just locate inch apart elongate holes slightly Use Radio Shack amplifier jacks guide spacing Place PC board housing mark location antenna will exit housing hole will below seam housing should allow antenna wire lay flush PC board Use 1A2 diameter drill drill exit hole antenna Using parts placement diagram Fig 3 guide cut side terminals length P1 P2 P1 side terminal shorter center terminal longer P2 reversed side terminal longer Insert PC board housing trial-fit P1 P2 position side terminals will have bent down toward board will rest board plugs will level exit housing plugs mounted PC board wire jumpers soldered board P1 has two jumpers secures side terminal against board goes up over threaded portion plug Solder both jumpers P1 using mimimum heat prevent damaging plug Solder top lead C9 center terminal P1 P2 mounted similar fashion except jumper ground PC board goes up over center terminal short jumper connected side terminal PC board near R9 Make sure both P1 P2 have shoulders flush against housing come straight out housing antenna made ten-inch length 025 piano wire available local hobby shop Clean wire steel wool sandpaper will solder easily bend short right-angle Z bend end wire insert PC board near U 1 Orient wire near Cl shown solder rectangular pad circuit side PC board near Ul Solder short jumper wire antenna PC board Cl actual connection antenna RF sniffer circuit As mentioned earlier Radio Shack audio amplifier must modified feed 9 VDC out sniffer circuit Normally insert plug DC connector battery disconnectedjust opposite what want Two short jumper wires will soldered PC board amplifier correct problem feed 9 VDC out connector volume control switch turned Remove back amplifier Join squadron Brand new squadron markings. Available 1/8 1/6 & 1/4 scales hiL $400 fri 44 Cat0V & Co& Ckajt Theres always thing new major decals29 works.squadron insignias NORTHEAST SCREEN GRAPHICS P0 BOX 304 EAST LONGMEAOOW MA 01028 TEL 413 525-4110 PAX 413-525-7704 October1997 71 remove two screws hold PC board case Carefully fold board out housing obtain access backside PC board Using photograph Fig 4 guide solder two short jumper wires PC board DC connector Use connectors PC board guide identify correct area board allow solder short nearby circuit runs Again need help ask local electronics expert Carefully reinstall PC board housing modification will course void warrantybut $12 really want modify amplifier yourself can sent source listed modification nominal fee new modified amplifier can also ordered same source desire After amplifier modified like ever use amplifier battery eliminator pluged DC power connector would apply voltage directly battery may cause damage Checkout Feed RF sniffer antenna through hole housing insert whole PC board assembly housing Plug sniffer side audio amplifier turn volume control way up listen closely low-level 3 kHz tone can heard speaker normal operation volume control needs turned up about 1/3 its rotation 3 kHz tone noticeable Remember volume control does control RF Sniffer sensitivity adjusts audio level coming out speaker signal received Turn RC transmitter its antenna down bring near RF sniffer transmitter within 24-36 inches sniffer noticeable 3 kHz tone should start heard transmitter six inches sniffer tone will very loud transmitter antenna extended can typically detect 15-20 feet away transmitter uses AM modulation will also hear raspy buzz along 3 kHz tone Radio em rrrsesown Focus 2AM Single Stick 27112 MHz$6999$9995 Focus 4 FM$12899$29995 Focus 6 FM$15799$24995 Flash 4 FM$14099$23995 Flash 5 FM$16799$30495 Challenger 250 AM$5499$6795 Prism 7X FM$21999$38495 Prism lx PCM$23999$41995 Prism 7X FM SPECTRA$29399$50995 Prism 7X PCM SPECTRA$33499$58995 SPECTRA Modules$9999$16995 Prism 7X FM SPECTRA Trausmitler Char9er$19999$34995 Focus 4 Truesmilter charger$4999 Fecus 6 Transmitter sod charger$5499 HITEC RECEIVERS eceloer RCD Micra 535 w/stal$6999$9995 Supreme Ru w/sIaI$6299$9995 PCM Ru tar KiTes$9499$13495 Micro 5-ch 75 MHz$4799$695 2-ch 27 & 75 MHz$2999$3995 2-ch AM Os 27/72 MHz$2999$4495 50 & 75MHZ Crystals$799$1395 Shredder OX$3999$4995 ZENOAH ENGINES G23777777$25496 G-39$25999 G-45$33499 0-62$37999 SAITO ENGINES SumsSale PriceRetail HS-69 Super Micro 15 sz$3799$5495 HS-69 Soh Micro 31 or$2399$3995 H589MG Suh Micra$3799$5495 HS-8589 Super Mini Single SB 39 uz$3299$4995 H5191 Mini 24uz$2199$3195 HS191MG$3299$4595 H5295BB Micro 43os$2699$4195 HS-295MG$3799$5995 HS-225BB Super Mini Micro 59 oz $3299$4995 HS-389 SId Spurt 42 or$1899$1695 HS-422 Pro Serve 43 es$1299$1995 HS-425BB Pro Dual 88 43 or$1999$2995 HS-S2SBB High Speed 47 ez$3499$5995 KS 54588 Hi Tsrqae 62 05$3499$5995 H5685BB Ultra Torque 77 or$3699$5995 95485MG Ult Torque 77 or$4599$7495 HS-61SMG 89 11900$4599$7495 H5799BB Giant 133 es$2999$4495 HS-795MG Giant 166 az$4299$6495 HS7SBB Retract 90 or$3999$5995 HS-725B8 Sail Winch 161 or$4799$7395 HS-995BB 224 Oz$3999$7395 GY-199BB Ball Soaring Gyro$9999$13495 SERVO VALVE DEALS SwitchHarness Four HS-390Save $596$4599 Faur HS-422Save $696$5299 Three HS-1O1$6599 Three HS-80$7199 Three 95-28588 & 000 HS-80 Save $597$19499 Three HS-799 & HS-422$9999 HITEC NiCd BATTERIES Battery Sole PriceOutsit Os 490 270 mahSovo $1699$1995 Os 48o 698 mahSave $1499$1795 Os 480 1088 mahSano $2499$2995 Tx 96v 698 mah Pocuo Series $2999$8395 Recolour Nitd SUPER SALE Flat Square Hilec/JO Falaha J Airironico connectors 690 mah$1199 tour br $4499 999 mah$1499 leer tur $5590 cogineOslo miceineisii PA-SO Gslden Knight ABC$19995$33495 FA-56 Golden Knight ABC$29999$34995 FA-65 Golden Knight ABC$21995$36995 FA-80 Golden Koight ABC$23995$41495 iS Golden Koight MC$24995$47495[iitiudes Fou/iS306Srvoi70iiSiitciiiiamess70ii FA-1295 Golden Knight MC$37499$57995Supreme 7 ch Recoiver ysur chauuel choice 699 mah Rn FA-iSO Golden Knight MC$38495$63495Battery Availahle S eclams br $19999 FA-SO OC ABC$19495$30995tour HS-422 servos add $799 taur HS-425 servos add FA-SO 0/C ACt$16995$31999$3599 Isar HS-605 servos add $19509 FA-65 OC ABC$19495$33495WIRING ACCESSORIES IJ S erA Connectursl FA-OD OC ABC$21495ItemSale PriceRetail PA-giS OC ACt$224956 Estesoion$499 $595 FA-1285 OC ACt$3399512 Estessiss$499 $595 FA-iso OC ACC24 Estension$599 $695 0/C AIRMODEL lOelioured Prices36 Extension$699 $795 0-Shark ME II$294996 Boosl/Buffer Estension$999$1395 NEW laser 200$3249912 Bsost/Buller Estennion$999$1395 CAP 231$3999924 Boost/BolIer Extension$1899$1495 98 Lasor$2499936 Boost/Buffer Esteosion$1199$1595 68 G-Shsrk$179996 Y Connector$799$995 2100S ORIGINALS24 Y Connoctsr$999$1895 ____Cj6 BeootlBotI Y Connector$999$1595 ______________________________Switch Harness$799$1995 58 3-lead Servs Wire$1199$1495 SPECIAL lO% OFFNONSALE Troiser cord Fotaha Compal $1199$1495 ITEMS TO AMA MEMBERS SEPTEMBER FREEBIE 6 GoldbergMini-Snaps order over $7500 ORDER TOLL FREE 1-800-604-6229 info 608 241-3491 Fax 608 241-1313 n-Mull Addoso hobbyherso@hshhyharoocom Vs Os Wek 5 o wwwhohhyhsrsecem V us MasterCard Welcome VISAPr coo Good Through September 301997 Repairs Updates Custom Modifications Frequency Changes 6 Send Legal sized SAE 1997 Meter conversions ACE Airtronics Aristo-craft Cirrus EKCatalog containing lists RIC maintenance hints Futaba Hitec Heathkit Hobby Shack JR Kraft KGL KSE KlineDiscover MCard VISA COD KoPropo Pro-Line RCD Tower Hobbies World Engines & othersUPS USMAIL FEDEX etc Calibrated Equipment Quick Turnaround Walk-in daily service 8-00 am-S 00 pm Send E-Mail PTWaters@lunocom October 1997 73 HOBBJHORSE 1769 Thierer RoadMadison WI 53704 Li]HITEC SERVOS ~pY%u RIC SERVICE AT ITS BEST Sales Service Anything Radio Controlled KMI 7420 Seven Mile Rd Northville Michigan 48167 Ph 248-486-4800 Fax 248-486-1603 sniffer does work turn off recheck circuit side PC board unsoldered joints shorts Also compare parts placement assembly drawing verify orientation components After everything checks out remove sniffer audio amplifier Test-fit sniffer housing cover sure will close up correctly Remove cover holding PC board down housing carefully apply some five-minute epoxy around P1 P2 secure PC board lock housing allow epoxy get seal perimeter housing prevent eye injury bend small loop end antenna distort end somewhat glue small plastic bead antenna can obtain beads craft store just remove push-pin Application The RF Sniffer intended scanner sensitive receiver However does detect nearby RC channelsincluding 27 MHz Citizens Band 50 MHz RC ham frequencies 72 75 MHz RC channelsif close source transmission insensitivity design Sniffer too sensitive would pick up transmitters operation flightline latter supposed want detect unit proves too sensitive transmitter impound close flightline easiest way reduce sensitivity simply shorten Sniffer antenna about 6-8 inches length Another option omit bias detector diodes supplied R9 Just cut its leads leave other end connected PC board want restore normal 4-40x1/2 socket caps sell S435/1 000 aiioy steel S665/1 00 stainless S750/50 aluminum fair prices sensible quantities fas teners need model building call write fax free catalog Micro Fasteners800-892-6917 110 Hillcrest Road908-806-4050 Flemington NJ 08822fax 908-788-2601 emoiI microf@blastnet Internethftp//microfastenencom 74 Model Aviation ation later just resolder R9 lead back together Sniffers dont cost much cheap insurance against costly loss prized aircraft possible injury pilots spectators normal current drain amplifier battery about ten milliamps mA Because typical nine-volt alkaline battery has rating 400 mA-hours sniffer will operate almost 40 hours battery Does Sniffer have other uses bet ya Use test own transmitters antenna up down gives baseline its normal operation have trouble RC system future can verify transmitter putting out normal power Note does substitute normal range check complete system though RF Sniffer optimized operation 20-100 MHz will detect anything transmits get close enough will verify operating lot fun running around house checking out things like cordless telephone garage door opener transmitter cell phone much surprise microwave oven use Schottky diodes Happy sniffing Hickey 1624 Maple Ave Hatfield PA 19440 PARTS LIST FOR THE RF SNIFFER 2100 SEMICONDUCTORS DlD2-SD1O1ACT Schottky barrier rectifier Q1-2N3904 NPN transistor U1-CD4O49UBE hex inverting buffer CMOS integrated circuit RESISTORS resistors 1/8 watt 5% carbon Only Made USA guts can make best 8 channel receiver market THE BLADE CUTTING EDGE ALL-NEW MADE IN USA MIcROcHIP DESIGN FEATURES FUlRasSumuIElssgllhaujaU Thecoheroerks aSh oil pormim FM DIRECT SIMS CONI5U iSO Alksa sewn tenohon ssSi DAD0 05C cor0r boo o DSC osypynd tononrbror FN 85515 INI1RCUUUSU 4-cur CEU cornecton fit AirtnOo Fodo J JR Hint AD sawn 4-sos HIGIEST 85515 SIGNIL MINT Digital pncesso sen1s IDO-% manner sewn siand at-er eceners 5wm4sw gem mmse Digital processor Iodu Tr cantod frores ha citlosa sewn posiraglirdr resistonin E1 1] p EU 1 ]d Ie{U IdgUad*I~ Torque taM5 Burnings @4Si @48e LaWaK Weight PI%Id Imsflilfe lCtfSn 2CSe 2301123 355. Pro tonlSiIfe 4415. 2CC. tAI7511A 175. P, PlUS IfSitite IffS. 2CC t817SC1A US. $2050 td5 lnfiIil tWIG. 2CC UXISSSA LII. IronfSiSt WIG. USe. XS2Ct1 770. Tot rstwin IriS. us uxISlie 16G. $3955 tFrdhS.Sqdl ~rn~ejWHdjGminuh.Ce. s.I~&sAeStje&dp FinttFS.& Still Only $7995, Made USA Specifications 3L t255 125111 Cs WI HlItflIepaCt NylCe W Case SIflsillYity 4 iCrg-tSIts miles re air rMt Mrs initaCeb 108Cc Cerot Oral otS uilllaups 13 apPrened Limited Litutim Wmuty Crystal lntrchaCea4lrn Diogroms side labels illustrate hors properly plug brando4 compatible battery serco connectors $5465 Complete DAD 1 2VIC CVC-type AC wall charger field kit Power Indicator team up assure flawless field kit battery performance teat roost hove ninety RiCer field kit finally coroplere mith system Always knot hors maci charge left starter battery flying field guess mark thing poor neon again over charge DAD0 charger Power Indicator team ossums fall charge oil times http//usersaolcom/DAflHOF. Ordering & Bealer 8494 Cottagewood Terr MN 55432lisqitires 0011 Technical Questions Phone/Fax 612 717-29191 806 6694548 order kits call 1-800-327-7198 e catalog fine kits send $400 Idaho Residents Add 5% State Sates Tax October 1997 75 UNIVERSAL I! iirrr rs ii rs O45J ssa iE [11 iii IKON offers largest selection giant scale kits world GiAN UALL UALt bU 1/4 SUAL 3b

If transmitter has left sniffers tone will let know People often comment things simpler good old days certainly true modem RC transmitters too years ago transmitters utilized AM Amplitude Modulation did provide bells-and-whistles now take granted Most new radio systems now have transmitters employ FM Frequency Modulation offer features includes systems called FIVI PCM PPM think would agree simple older systems much better number years ago circuit published RF sniffer George Steiner believe basically diode detector circuit its output applied input Radio Shack audio amplifier combination placed near operating RC transmitter speaker would emit loud buzz buzz detected AM modulation made several RF sniffers club has used number years club transmitter impound served us well club sponsors KRC Electric Fly major event Electric-powered model aircraft enthusiasts 1996 almost 300 transmitters impound area used two sniffers table incoming transmitters come used sweep transmitter racks tables periodically sure no switches accidentally bumped during handling During last few years have seen increase number FM PCM radio systems being used also noticed RF sniffers did detect new systems very well almost touch new transmitters sniffer antenna buzz emitted speaker barely audible reason sniffer designed detect AM modulation no AM modulation detect decided time new RF sniffer designone would detect transmitter type modulation equally wellan RF sniffer would take us 21st century call RF Sniffer 2100 Circuit Description schematic shown Fig 1 Qi its associated components Rl R2 R4 R5 Cl C4 form broad band RF amplifier approximately 10 dB gain output amplifier coupled biased Schottky diode AM detector circuit thru high pass RF filter comprised C3 Li C5 combination RF amplifier low pass filter provide RF front end amplification below 20 MHz above 100 MHz Resistor R9 supplies trickle DC bias current thru detector diodes Dl D2 increase sensitivity low level RF Continued page 65 62 Model Aviation y use plugged modified Radio Shack audio amplifier Text has sources components RF Snifter unit complete less amplifier Antenna ten-inch piece 025 music wire PC board Radio Shack amplifier shows modification required using jumper wires maintain battery connection Figure 2 Overall view shows parts placement Sniffer detects model aviation frequencies U John Hickey 109 25 OOPSSOIOIACTSI ICD4049 402 09ERTU9G BUFPER 7K 10 V 11w 12 14IS PIG SOIlSO999955P9911r2100 Figure 1 Figure 3 27 09S OUTPUT h# 499 DllFI 190IOIACT ber 1997 63 196 inches i-i 12 Inches TI 0 0975 inches between centers Approx 075 Inches FIg 2 Pans P4aoutdgos9S 059 ho9lngm gIdeSo 0999 P1 9Sd P2 RF SnifferlNickey Continued page 62 signals germanium detector diodes used original sniffer type 1N34A still available Radio Shack can subsituted Schottky diodes specified circuit powers amplifier completes new design Integrated circuit Ul contains six CMOS inverting buffers Sections b together R6 R7 C7 connected form square wave oscillator component values cause oscillate approximately 3 kllz audio frequency often used alarm sound hard ignore 3 kHz square wave drives remaining four sections integrated circuit wired parallel provide power driver switches amplifier circuit off 3 ld{z rate has effect chopping AM modulating RF signal comes thru amplifier circuit 3 kHz rate Thus FM signals arriving amplifier have AM modulation added before fed AM detector circuit high pass filter output amplifier attenuates 3 kHz modulation signal over 100 dB modulation signal itself does come out detector unless actually derived RF signal coming thru amplifier R3 C2 integrate square wave have effect softening rise fall square wave driving amplifier minimizes 3 kHz transients Ql switched off R8 C8 filter 9 VDC line prevent 3 kHz signal getting back audio amplifier thru DC line RF Sniffer packaged small plastic enclosure conveniently plugs right side Radio Shack amplifier audio output detector connected input Radio Shack audio amplifier ninevolt DC power sniffer supplied nine-volt DC connector Radio Shack amplifier Getting 9 VDC out power jack amplifier having controlled switch volume control requires slight modification amplifier will discuss later selling price about $12 Radio Shack audio amplifier still least-expensive ways get portable audio amplifier built-in speaker power source Note newer versions Radio Shack Amplifier can used old versions did have DC power jack Construction unit shown built printed circuit board have built unit using Radio Shack perforated universal printed circuit board easy task choose go route try use similar layout make ground runs wide similar PC board ease assembly reliable operation PC board recommended good old days electronic parts MW III SLTMPOU IbmuiI Yquw Id IT 7 aiting new WE K&B paint line Its worth wait K&B SuperPoxy best paint industry knew going challenge repeat success SuperPoxy ULTRAPOXY has done will see what mean try ULTRAPOXY exceeds expectations anticipated new paint line ULTRAPOXY has same strong durable fuel proof finish SuperPoxy best has clear coat already finish has deep high gloss unmatched other paint Better yet two part epoxy paint requires no thinner coverage exceptional spray light dust coat followed final flow coat youre done finish looks like youve spent hours wet sanding painting youre sure get comments wondering got such fantastic finish ULTRAPOXY comes standard base colors match colors popular heat shrink coverings So now its easy match painted parts rest film-covered parts model Additionally satin catalyst available wishing silkier finish ULTRAPOXY available local hobby dealer still have some SuperPoxy paint left over K&B hasnt forgotten Catalyst thinner will still available period time ULTRAPOXY K&B keeping promise providing quality modeling products model enthusiast K& het4r its Field Siwe 194f 520045303579/520045303583 t 2100 College Dr Lake Havasu Cliv Arizona 86403 E marl k&b@Inknet corn October 1997 65 INC OR P0 RATED WORLDS LARGEST MANUFACTURER OF SUPERIOR EPOXY-GLASS COWLS WHEEL PANTS & ACCESSORIES IIIIII D CALL NOW 810 677-0213 FAX 810 677-0414 orders Send $100 CaOpen $2 00 CanadaMonday Friday II ii I$3000utaideofUSA lOam4pmEST Sky Karbor RO Presents Mike Del Pontes Reviution V-Tail Q-500 Fits 40 size motors Pilots choice NATs four years running Holds numerous 0-500 Pylon records Standard equipment top pilots like Chip Hyde Richard Verano Mark Parker & Tony Lopez Hand crafted custom built ARF Light weight pre-built fuselage piece sheeted wing epoxy carbon fiber reinforcing hand select weigh piece balsa ensure 35 lbs airplane Predictable racing plane yet stable docile sport plane Proven race winning building set up details included $13500 ping Modified p-5l Series True Scale Outline ou size a & riywooo uonstrucrion ize aesignes ror rJeison ueo oesigneo YS 91 YS 140 Wing Cores r Canopy plus ABS cowl Scoop Exhaust Build Kit ARE Kit ges Rolled Plans ls Available le Racing/Sport Plane e Warbird Ruciog Association Champion MASIER AIRSCREW 3-Blade Series Propellers Now sizes 11x8$895 12x6995 13x81095 sizes come Availlable local hobby dealer Send SASE catalog Windsor Propeller Co Inc 3219 Monler Circle Rancho Cordova CA 95742 Ph 9166318385 Fax 9166318386 email 726731 lO@compuservecom easier buy local electronics stores Nowadays areas have Radio Shack stores handy carry types parts number good mailorder supply houses such favorite Digi-Key often have buy parts multiples five 10 often have miminum-order policy RF Sniffer really useful device want make easy average modeler obtain have found local company willing supply necessary parts An etched-and-drilled PC board complete kit parts available supplier listed dont feel comfortable soldering small components enlist help local electronics experts club built tested unit also available source listed Please note kit includes parts RF Sniffer Radio Shack amplifier will modify Radio Shack amplifiers sell new modified amplifier handled separately See details end parts list electronics enthusiast have parts list available Digi-Key part numbers also Radio Shack part numbers available copy send SASE John Hickey 1624 Maple Ave Hatfield PA 19440 Refer parts-placement diagram shown Fig 3 assembling circuit installing parts PC board recommend bending leads over circuit side board Cut short before soldering make sure will short adjacent circuit run Begin mounting resistors PC board install two jumper wires near Ul use discarded resistor leads jumpers Next install capacitors Cl thru C9 being careful observe correct polarity inserting C8 Capacitor C9 installed vertically its leads goes down PC board soldered other lead stands vertically away PC board lead will later soldered center pin P1 Install Dl D2 Ql Ul Orient parts shown remember banded end Dl D2 cathode indicated bar diode symbol housing used available Radio Shack cat no 270-288 held together single screw back side Modifications Sniffer housings easy Screw together tightly wrap several layers tape lengthwise around housing hold halves together securely drilling holes P1 P2 Note following hole diameters proper sizes Radio Shack versions plugs use another source verify correct hole sizes Locate drill 15/64 diameter hole 75 inch up bottom right-hand corner center seam side housing Sky Harbar RC Phoenix AZ USA 976-6341 wwwinficadcoml-skyharrc Dennis & Dorinda ThomasZ Fre8 Color Brochure Spring 97 Release Great Scale Look Superior Performance NASA Airfoils Greater Thrust Lower RPMs Accurately Balanced DC connector P2 Carefully measure up 975 inches P2 hole drill 1 1A2 diameter hole audio output connector P1also side seam housing P1 P2 spacing required plug Radio Shack amplifier have trouble accurately measuring 975 inches just locate inch apart elongate holes slightly Use Radio Shack amplifier jacks guide spacing Place PC board housing mark location antenna will exit housing hole will below seam housing should allow antenna wire lay flush PC board Use 1A2 diameter drill drill exit hole antenna Using parts placement diagram Fig 3 guide cut side terminals length P1 P2 P1 side terminal shorter center terminal longer P2 reversed side terminal longer Insert PC board housing trial-fit P1 P2 position side terminals will have bent down toward board will rest board plugs will level exit housing plugs mounted PC board wire jumpers soldered board P1 has two jumpers secures side terminal against board goes up over threaded portion plug Solder both jumpers P1 using mimimum heat prevent damaging plug Solder top lead C9 center terminal P1 P2 mounted similar fashion except jumper ground PC board goes up over center terminal short jumper connected side terminal PC board near R9 Make sure both P1 P2 have shoulders flush against housing come straight out housing antenna made ten-inch length 025 piano wire available local hobby shop Clean wire steel wool sandpaper will solder easily bend short right-angle Z bend end wire insert PC board near U 1 Orient wire near Cl shown solder rectangular pad circuit side PC board near Ul Solder short jumper wire antenna PC board Cl actual connection antenna RF sniffer circuit As mentioned earlier Radio Shack audio amplifier must modified feed 9 VDC out sniffer circuit Normally insert plug DC connector battery disconnectedjust opposite what want Two short jumper wires will soldered PC board amplifier correct problem feed 9 VDC out connector volume control switch turned Remove back amplifier Join squadron Brand new squadron markings. Available 1/8 1/6 & 1/4 scales hiL $400 fri 44 Cat0V & Co& Ckajt Theres always thing new major decals29 works.squadron insignias NORTHEAST SCREEN GRAPHICS P0 BOX 304 EAST LONGMEAOOW MA 01028 TEL 413 525-4110 PAX 413-525-7704 October1997 71 remove two screws hold PC board case Carefully fold board out housing obtain access backside PC board Using photograph Fig 4 guide solder two short jumper wires PC board DC connector Use connectors PC board guide identify correct area board allow solder short nearby circuit runs Again need help ask local electronics expert Carefully reinstall PC board housing modification will course void warrantybut $12 really want modify amplifier yourself can sent source listed modification nominal fee new modified amplifier can also ordered same source desire After amplifier modified like ever use amplifier battery eliminator pluged DC power connector would apply voltage directly battery may cause damage Checkout Feed RF sniffer antenna through hole housing insert whole PC board assembly housing Plug sniffer side audio amplifier turn volume control way up listen closely low-level 3 kHz tone can heard speaker normal operation volume control needs turned up about 1/3 its rotation 3 kHz tone noticeable Remember volume control does control RF Sniffer sensitivity adjusts audio level coming out speaker signal received Turn RC transmitter its antenna down bring near RF sniffer transmitter within 24-36 inches sniffer noticeable 3 kHz tone should start heard transmitter six inches sniffer tone will very loud transmitter antenna extended can typically detect 15-20 feet away transmitter uses AM modulation will also hear raspy buzz along 3 kHz tone Radio em rrrsesown Focus 2AM Single Stick 27112 MHz$6999$9995 Focus 4 FM$12899$29995 Focus 6 FM$15799$24995 Flash 4 FM$14099$23995 Flash 5 FM$16799$30495 Challenger 250 AM$5499$6795 Prism 7X FM$21999$38495 Prism lx PCM$23999$41995 Prism 7X FM SPECTRA$29399$50995 Prism 7X PCM SPECTRA$33499$58995 SPECTRA Modules$9999$16995 Prism 7X FM SPECTRA Trausmitler Char9er$19999$34995 Focus 4 Truesmilter charger$4999 Fecus 6 Transmitter sod charger$5499 HITEC RECEIVERS eceloer RCD Micra 535 w/stal$6999$9995 Supreme Ru w/sIaI$6299$9995 PCM Ru tar KiTes$9499$13495 Micro 5-ch 75 MHz$4799$695 2-ch 27 & 75 MHz$2999$3995 2-ch AM Os 27/72 MHz$2999$4495 50 & 75MHZ Crystals$799$1395 Shredder OX$3999$4995 ZENOAH ENGINES G23777777$25496 G-39$25999 G-45$33499 0-62$37999 SAITO ENGINES SumsSale PriceRetail HS-69 Super Micro 15 sz$3799$5495 HS-69 Soh Micro 31 or$2399$3995 H589MG Suh Micra$3799$5495 HS-8589 Super Mini Single SB 39 uz$3299$4995 H5191 Mini 24uz$2199$3195 HS191MG$3299$4595 H5295BB Micro 43os$2699$4195 HS-295MG$3799$5995 HS-225BB Super Mini Micro 59 oz $3299$4995 HS-389 SId Spurt 42 or$1899$1695 HS-422 Pro Serve 43 es$1299$1995 HS-425BB Pro Dual 88 43 or$1999$2995 HS-S2SBB High Speed 47 ez$3499$5995 KS 54588 Hi Tsrqae 62 05$3499$5995 H5685BB Ultra Torque 77 or$3699$5995 95485MG Ult Torque 77 or$4599$7495 HS-61SMG 89 11900$4599$7495 H5799BB Giant 133 es$2999$4495 HS-795MG Giant 166 az$4299$6495 HS7SBB Retract 90 or$3999$5995 HS-725B8 Sail Winch 161 or$4799$7395 HS-995BB 224 Oz$3999$7395 GY-199BB Ball Soaring Gyro$9999$13495 SERVO VALVE DEALS SwitchHarness Four HS-390Save $596$4599 Faur HS-422Save $696$5299 Three HS-1O1$6599 Three HS-80$7199 Three 95-28588 & 000 HS-80 Save $597$19499 Three HS-799 & HS-422$9999 HITEC NiCd BATTERIES Battery Sole PriceOutsit Os 490 270 mahSovo $1699$1995 Os 48o 698 mahSave $1499$1795 Os 480 1088 mahSano $2499$2995 Tx 96v 698 mah Pocuo Series $2999$8395 Recolour Nitd SUPER SALE Flat Square Hilec/JO Falaha J Airironico connectors 690 mah$1199 tour br $4499 999 mah$1499 leer tur $5590 cogineOslo miceineisii PA-SO Gslden Knight ABC$19995$33495 FA-56 Golden Knight ABC$29999$34995 FA-65 Golden Knight ABC$21995$36995 FA-80 Golden Koight ABC$23995$41495 iS Golden Koight MC$24995$47495[iitiudes Fou/iS306Srvoi70iiSiitciiiiamess70ii FA-1295 Golden Knight MC$37499$57995Supreme 7 ch Recoiver ysur chauuel choice 699 mah Rn FA-iSO Golden Knight MC$38495$63495Battery Availahle S eclams br $19999 FA-SO OC ABC$19495$30995tour HS-422 servos add $799 taur HS-425 servos add FA-SO 0/C ACt$16995$31999$3599 Isar HS-605 servos add $19509 FA-65 OC ABC$19495$33495WIRING ACCESSORIES IJ S erA Connectursl FA-OD OC ABC$21495ItemSale PriceRetail PA-giS OC ACt$224956 Estesoion$499 $595 FA-1285 OC ACt$3399512 Estessiss$499 $595 FA-iso OC ACC24 Estension$599 $695 0/C AIRMODEL lOelioured Prices36 Extension$699 $795 0-Shark ME II$294996 Boosl/Buffer Estension$999$1395 NEW laser 200$3249912 Bsost/Buller Estennion$999$1395 CAP 231$3999924 Boost/BolIer Extension$1899$1495 98 Lasor$2499936 Boost/Buffer Esteosion$1199$1595 68 G-Shsrk$179996 Y Connector$799$995 2100S ORIGINALS24 Y Connoctsr$999$1895 ____Cj6 BeootlBotI Y Connector$999$1595 ______________________________Switch Harness$799$1995 58 3-lead Servs Wire$1199$1495 SPECIAL lO% OFFNONSALE Troiser cord Fotaha Compal $1199$1495 ITEMS TO AMA MEMBERS SEPTEMBER FREEBIE 6 GoldbergMini-Snaps order over $7500 ORDER TOLL FREE 1-800-604-6229 info 608 241-3491 Fax 608 241-1313 n-Mull Addoso hobbyherso@hshhyharoocom Vs Os Wek 5 o wwwhohhyhsrsecem V us MasterCard Welcome VISAPr coo Good Through September 301997 Repairs Updates Custom Modifications Frequency Changes 6 Send Legal sized SAE 1997 Meter conversions ACE Airtronics Aristo-craft Cirrus EKCatalog containing lists RIC maintenance hints Futaba Hitec Heathkit Hobby Shack JR Kraft KGL KSE KlineDiscover MCard VISA COD KoPropo Pro-Line RCD Tower Hobbies World Engines & othersUPS USMAIL FEDEX etc Calibrated Equipment Quick Turnaround Walk-in daily service 8-00 am-S 00 pm Send E-Mail PTWaters@lunocom October 1997 73 HOBBJHORSE 1769 Thierer RoadMadison WI 53704 Li]HITEC SERVOS ~pY%u RIC SERVICE AT ITS BEST Sales Service Anything Radio Controlled KMI 7420 Seven Mile Rd Northville Michigan 48167 Ph 248-486-4800 Fax 248-486-1603 sniffer does work turn off recheck circuit side PC board unsoldered joints shorts Also compare parts placement assembly drawing verify orientation components After everything checks out remove sniffer audio amplifier Test-fit sniffer housing cover sure will close up correctly Remove cover holding PC board down housing carefully apply some five-minute epoxy around P1 P2 secure PC board lock housing allow epoxy get seal perimeter housing prevent eye injury bend small loop end antenna distort end somewhat glue small plastic bead antenna can obtain beads craft store just remove push-pin Application The RF Sniffer intended scanner sensitive receiver However does detect nearby RC channelsincluding 27 MHz Citizens Band 50 MHz RC ham frequencies 72 75 MHz RC channelsif close source transmission insensitivity design Sniffer too sensitive would pick up transmitters operation flightline latter supposed want detect unit proves too sensitive transmitter impound close flightline easiest way reduce sensitivity simply shorten Sniffer antenna about 6-8 inches length Another option omit bias detector diodes supplied R9 Just cut its leads leave other end connected PC board want restore normal 4-40x1/2 socket caps sell S435/1 000 aiioy steel S665/1 00 stainless S750/50 aluminum fair prices sensible quantities fas teners need model building call write fax free catalog Micro Fasteners800-892-6917 110 Hillcrest Road908-806-4050 Flemington NJ 08822fax 908-788-2601 emoiI microf@blastnet Internethftp//microfastenencom 74 Model Aviation ation later just resolder R9 lead back together Sniffers dont cost much cheap insurance against costly loss prized aircraft possible injury pilots spectators normal current drain amplifier battery about ten milliamps mA Because typical nine-volt alkaline battery has rating 400 mA-hours sniffer will operate almost 40 hours battery Does Sniffer have other uses bet ya Use test own transmitters antenna up down gives baseline its normal operation have trouble RC system future can verify transmitter putting out normal power Note does substitute normal range check complete system though RF Sniffer optimized operation 20-100 MHz will detect anything transmits get close enough will verify operating lot fun running around house checking out things like cordless telephone garage door opener transmitter cell phone much surprise microwave oven use Schottky diodes Happy sniffing Hickey 1624 Maple Ave Hatfield PA 19440 PARTS LIST FOR THE RF SNIFFER 2100 SEMICONDUCTORS DlD2-SD1O1ACT Schottky barrier rectifier Q1-2N3904 NPN transistor U1-CD4O49UBE hex inverting buffer CMOS integrated circuit RESISTORS resistors 1/8 watt 5% carbon Only Made USA guts can make best 8 channel receiver market THE BLADE CUTTING EDGE ALL-NEW MADE IN USA MIcROcHIP DESIGN FEATURES FUlRasSumuIElssgllhaujaU Thecoheroerks aSh oil pormim FM DIRECT SIMS CONI5U iSO Alksa sewn tenohon ssSi DAD0 05C cor0r boo o DSC osypynd tononrbror FN 85515 INI1RCUUUSU 4-cur CEU cornecton fit AirtnOo Fodo J JR Hint AD sawn 4-sos HIGIEST 85515 SIGNIL MINT Digital pncesso sen1s IDO-% manner sewn siand at-er eceners 5wm4sw gem mmse Digital processor Iodu Tr cantod frores ha citlosa sewn posiraglirdr resistonin E1 1] p EU 1 ]d Ie{U IdgUad*I~ Torque taM5 Burnings @4Si @48e LaWaK Weight PI%Id Imsflilfe lCtfSn 2CSe 2301123 355. Pro tonlSiIfe 4415. 2CC. tAI7511A 175. P, PlUS IfSitite IffS. 2CC t817SC1A US. $2050 td5 lnfiIil tWIG. 2CC UXISSSA LII. IronfSiSt WIG. USe. XS2Ct1 770. Tot rstwin IriS. us uxISlie 16G. $3955 tFrdhS.Sqdl ~rn~ejWHdjGminuh.Ce. s.I~&sAeStje&dp FinttFS.& Still Only $7995, Made USA Specifications 3L t255 125111 Cs WI HlItflIepaCt NylCe W Case SIflsillYity 4 iCrg-tSIts miles re air rMt Mrs initaCeb 108Cc Cerot Oral otS uilllaups 13 apPrened Limited Litutim Wmuty Crystal lntrchaCea4lrn Diogroms side labels illustrate hors properly plug brando4 compatible battery serco connectors $5465 Complete DAD 1 2VIC CVC-type AC wall charger field kit Power Indicator team up assure flawless field kit battery performance teat roost hove ninety RiCer field kit finally coroplere mith system Always knot hors maci charge left starter battery flying field guess mark thing poor neon again over charge DAD0 charger Power Indicator team ossums fall charge oil times http//usersaolcom/DAflHOF. Ordering & Bealer 8494 Cottagewood Terr MN 55432lisqitires 0011 Technical Questions Phone/Fax 612 717-29191 806 6694548 order kits call 1-800-327-7198 e catalog fine kits send $400 Idaho Residents Add 5% State Sates Tax October 1997 75 UNIVERSAL I! iirrr rs ii rs O45J ssa iE [11 iii IKON offers largest selection giant scale kits world GiAN UALL UALt bU 1/4 SUAL 3b