cRdio SOME ANSWERS begin letter Mark Scheda Rochester NY Mr George M Myers AMA Dist #2 Frequency Coordi Dear Mr Myer noteyour attenti situation whicWyou might take est During May June experienced severe interference problems three different occasions using RC44 western NY flying brandnew seven-channel Airtronics Champion ship Series FM transmitter receiver Heres description incidents 1 Flying Grand Island about five miles north Buffalo Severe interference produced crash time convinced interference plane new yet trimmed 2 & 3 Flying Niagara Falls about 15 miles north Buffalo Two sets inter ferencesno crashes 4 Flying Barker about 45 miles northeast Buffalo No interferences After 3 pulled entire system aircraft returned Airtronics did complete check found nothing wrong changed system RC4O note returned radio asking TV4 transmitter Buffalo answer yes note explained TV4 can interfere Airtronics receiver RC44 Since change RC 40 have single problem summer fall 1984 probab ly 10 hours flight time folks Airtronics extremely helpful courteous times both speaking phone written corres nde east com f note oth problIf anio onpart Recheda Fir requires specia edd AMA its official journalI Aviation exist give AMA meopportunity ha wiat tby vase o was created &servis 38 ModeI Aviation Technique rmation e TR 0 used scoring 1983 hays Soaringd continuous op Le ndon threea location adjacent im area aw no evidence re d interference witacknow th 4 Likportabled co ercial ii interfe w C e n d t vi o cassette reco ers ha atAirt oni s abl cou eo s epo ntialto n tingint nd helpful / f enc wi esse y situa reaso TV4 inte wi man tion di t Interference channels th t C rece h pens absolu ly pr table ope te n superhetrodyneen listed few ossib principle rhetrodyne radio oper- ference combinations m col s ates mixing two radio frequencies to- May Juuie 1983 got gether can extract information mail decided lay back d sums differences TV4 sound let nature take its course has FM centered 714 MHz deviating Dual-conversion receivers sh uld n t 10075MHz normal operation have problem TV4 pr blem RC receiver receives TV4 peculiar old-style single-co ersio sound carrier high enough level TV4 superhetrodyne receiver tha ses 455 sound can intermodulate receiv- kHz IF amplifier du rsion ers local oscillator transmissions receivers might have similar oble other RC transmitters way other TV channels Please n te said produces detectable interference might have problems use monitor often hear case doubt turn receiver pulse-modulated TV4 sound track first watch whil e what some RC channel RC happenswhich should no n smitter operating vicinity monitor have demonstrated Next Peter Jacobitz 14113 several clubs using either Airtronics East Boston MA writes monitor others like Lange converter What really frightening about am two-year no RC ask operating RC FM transmit- questions find en ne ter usually AC channel dWferent doesnt know answer hey ge rally being intetfered have say Dont worry abou wh example used Tower Gold 500 re mean dont kn urn transmitter AM RC4O demonstrate TV4 sound FM Or/Wh 72400 ha Tower Gold 500 ystem MHz Airtronics Scanner AM RC48 turn pow RX hadnt noticed RC44 could interfere TX th ervos buzz hatter itself apparently others have twitch Standin feet aw TX As Mark Scheda has correctly observed antenna fully exte ed ru ing hands effect strongest fly close over case ortappi auses avariety TV transmitter less 20 miles awi drops off insignificance greater distances like 45 miles i e s t 1 e e Marks experience have also observe sfl loose insi e interference effect stronger whe r dti1i e eable cryst operating TV set vicini e h somethin within 20 feet tuned TV4 T due fact operating supe tight Faili hetrodyne receiver like TV radiat broken b t something its local oscillator wa before y its antenna observe effect whe th folks try tune two pocket AM radios ow t w same station whistle make i t o u c deduce someone operates TV ourself ed sugges s receiver vehicle flying field send b camper instance might produce interference situation other- A 8 s wise free glitches ton writes .. h tw Personal computers operating h both Futaba is se -c n field have same potential mak JC48 FM othe T n 0 glitches although must report th 1AM Ietsco ir-this 120 &ofl its first outing FM set RC48 Kraft AM radio Blue/White 72160~Jz wagjt back beings Ithough7Ih bad FM receivuntfl7llow c b ember flying RC#M lt interference K1 transmitter RC54 above radios hl good around range Testing own AM radio producec FM set though Kraft radio called Futaba apis technical person disclaimed problem FM radi indicated probable splash AM ra .. could explain sc commentsme tions to problem aircraft airborne 1 intend enlist tne help other club members carry out further testing David J Watson no AMA number given Taylors SC sent copy letter Circus Hobbies reads part . have returned radios five times three times Unlimited 8 twice Century 7 just gave new receiver say aligned test flew Century 7 acting up again Both FM radios give trouble Circus Apollo 6 Circus 4 both A4 radios .. am getting desper\te Five good planes have destroyed becaus radio problems fri dsw uba Kraft dont seem i th se troubles radios p lei4s please tell t m ha can correct proble . scope activities Bob haveNow different kind problem defined reasonable expect RCCarl G Godlewski Westport CT AMA operators43818 writes simplest test 31M desc ecd AMA HQ 9 Jan 1985 last month comprehe e tes Dear Mr Myers program given mn September 984 issue ortunately e e two letters FC ha/ent een tes pos le requestin aprw 4M combinations use am operators lic ] aven need license ired operate avetoextend ra53300 MHz - I sent first request the] about April 1 onths p ed respor miii u e i rs nt co requesttotheFC edflr smitter 1 can n DC have yet toi e e te e afewtr fr m eithe about 600 f eir dio atpteristics jn f dli ns acquired 1 illegal s rs Ouflu t t ning Since ow tha M 5 er requests imitter likely cause ing anay. bu - problem Now will Mosttrepidation li often wont repeat theme keyquate future good receiver summary operators license Should continue t pro FC comatose giant s ep As newcomer h help can give e r h Angel Mendoza no AMA number given writes Huntington Beach CA say .. After reading article Sep tember 1984 issue Model Aviation bought Kraft KP7C system KPR-8FD FM dual-conversion receiver September 1984 column synthesized radio Im sure whatAngel bought suspect KPR-SFDS GMM 1 First session Mile Square OK six flights 2 Next session Sepulveda Basin Bad giitch Landed safely 3 Tests home showed Fu taba RC48 AM would interfere Kraft RC56 FM 4 TX RX modules Kraft As can see doesnt matt manufact rer buy Fts5 Three weeks passed gettingeproblemiswidesd ng session Mile Square six roblem repo a1e c ing freq Next session Throttle out control n ber w FM radiosiceBack Kraft No fix National fllot ofradios hi e6P out business told send itto Arizona market use old si e-conversio kHz IF design except Ha owned super radio 90 days 8FD KPR-8FDS rec ers w i ar -conversion t3rles F r ght y u might interested will know Bob Aberle predicting least th dual-conversion S ne th s uthesized radios got out required meet 1991 con tr istor would pass AM available evidence single-conversi ugh front end Unfortunatesets work well enough themsel s sely\ dropped out domestic RC dozens reports Bob Aberle i lyingprodti,t n business about same time Models magazine reader le rs likwhich S AFUd repair people above susceptible interme vise anyone synthesizer ference operated groups d oblem contact Pete Waters column has offered test pr edu strict VII vice-president 117 time time based deaE aim Upper Level Northville MI similar tests would performe o r48 ry few has readers using normally-availab equthe ool onents training ment So far person has rittQn tserv e sn esizers missed go us about testing an1ck dJj c0lumn March beauty Unfortii 02col3 1984 get tand yJRFM C office 4 Three change life s patient turn over Amate ARRL 225 Mai S 06111whichhassi c s over US s 1eer Examination Coor tivity conducted Clubs iso e 1 first point tact e w supply list lo cl d li testing sessions te 4 advance nib Ultimately FCC Fo ed stamped envelop uired fir take writt st ficiency test o qualify license Said te a VECsforasma f st ts4 forwardedbyth V C eFC later issues 1 csey Amateur Rathcouseare taught Adulc schools th both tests Yo ~ch couple boo r fre address aboveom theco lishing CorpsideAye iton Park NY 115 6eillbe ion answerL e r will theAm te r youthencott e Benton Harb ic offeracodea$ eorycu e cassettes witmpanying 5 iiContinuedo ag38 May 1 letter represi received FC 1* PLANS * TARBGbY 7 cially Turn-around thin 850 sq in. 120 cycle powered Ron Chidgey design templates computer plotted smooth solid performer Rib Plans construction hints $1 195 TIGER TAIL 4 Ron Chidgeys latest best series little larger lighter slower retains honest flight characteristics Its predecess ors Plans construction hInts WELLER 3 BLADE FIBERGLASS PROP proven lh hats Interna tIonal competition 1310 $2000 IVANS MAGIC GADGET protractor device used Ivan Krlatensen accurately measure aileron elevator add rudder throw Takes guess work out trimmIng Out airplane qualIty tool complete Instructions log book carrying case $795 SEE YOUR DEALER OR ORuaK UIRtLI lieve March 1937 plane Frank Tinsley think Loire French gull-wing parasol fightershown rear top quarter climbed toward title have first-issue covers framed am missing father thanks mother thanks thank you. Bill Winter 4432 Altura Ct Fafrfax VA 22030 Editor Bill Winter has granted leave absence producing col unin period time presently determined meantime have hand couple other articles Bill will printed next few months Before anyone jumps wrong conclu sion let make plain hasnt fired arent unhappy him isnt unhappy us let urge readers refrain writing Bill editorial offices about quick resumption Fun column would WING TUBE & SOCKETS Aluminum alloy tubing plug-In wings Included pair special slipfit phenolic sockets build wing structure Now size models 718 die x 3 5 1* die x 2 5 1$ die x 3 5 ENGINE SLEEVE BEARING PULLER Pull tight sleeves bearings easily damage new 00s wIth 1ThW reaL bearing Both SLEEVE PULLER 0795for BEARING PULLER -15$1395 TRANSMITTER CASE An ineepensive rugged molded case protect expensIve transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1695 Qator WC Products 3713 PolapaflO Drive P Paniacola FL 3251$ Phone 90$ $76- 8639 INCLUVE $100 PER ITEM FOR UPS counterproductive rl R Wheeley Tucano/Naber Continued page 36 model cut out LMF painted small brush Using method can get correct scale stars bars etc have use closest-available size decals dont need seal painted-on items coat clear decals have mix special color remember keep small amount touch-ups probably will neces sary later Flying past building flying experiences guess have flown ofjust about popular model avail able Yet initial takeoff newly-completed model always have first flight jitters time no different engine running ship sitting end McDonnell-Douglas clubs asphalt run way time comes have advanced throttle power aircraft ran true down runway actually made nice slow takeoff itself due too much up-eleva tor trim After Tucano climbed flight altitude necessary trim abit down-elevator flew model around about six laps field prepared first landing lowered retract gear added about 25% flaps new model like limit first flight takeoff landing know handles well crucial areas nerves relax little can turn attention various other maneuvers following flights Tucano landed just like Curare Pattern airplane say least quite impressed what developed subsequent flights found due basic long moment arrangement flies smoothly nearly responsively Pattern airplane Landings flat true no tendency drop wing tip extremely low landing speeds first three Sport Scale contests entered Tucano static points right up other top models Everyone has seen fly tells impressed Tucano s looks air What could modeler want Buy big bag balsaand happy building Radio Technique/Myers Continued page 39 als Heath catalog changes time time dont hold against product has discontinued Specifically Radio Telephone oper ators license pilot has con fers license use Aviation Band 109135 MHz does permit use Amateur Radio bands George M Myers 70 Froehlich Farm Rd. Hicksville NY 11801 138 ModelAviation . CW f oo Designed Turnaround Pattern 3de~1 dd ~0O O~Gte le5 tB &MODEL AIRCRAFT 9$~ ex w P0 Box 1902 Greenville TX 75401 2144546441 GONTIOLIKI ThU PROFILE0COMBA 7RA T WIDE & NARROW WEDGE 1 5 6 oz Capacities UNIFLOW & STINDD Custom lieu Fuels Ingredients detailed bochur5OC stomps/check CAROLINATAFFINDER 8345 Delhi Road Charleston Hats. SC 29418 3563-7169
Edition: Model Aviation - 1985/05
Page Numbers: 38, 39, 138
cRdio SOME ANSWERS begin letter Mark Scheda Rochester NY Mr George M Myers AMA Dist #2 Frequency Coordi Dear Mr Myer noteyour attenti situation whicWyou might take est During May June experienced severe interference problems three different occasions using RC44 western NY flying brandnew seven-channel Airtronics Champion ship Series FM transmitter receiver Heres description incidents 1 Flying Grand Island about five miles north Buffalo Severe interference produced crash time convinced interference plane new yet trimmed 2 & 3 Flying Niagara Falls about 15 miles north Buffalo Two sets inter ferencesno crashes 4 Flying Barker about 45 miles northeast Buffalo No interferences After 3 pulled entire system aircraft returned Airtronics did complete check found nothing wrong changed system RC4O note returned radio asking TV4 transmitter Buffalo answer yes note explained TV4 can interfere Airtronics receiver RC44 Since change RC 40 have single problem summer fall 1984 probab ly 10 hours flight time folks Airtronics extremely helpful courteous times both speaking phone written corres nde east com f note oth problIf anio onpart Recheda Fir requires specia edd AMA its official journalI Aviation exist give AMA meopportunity ha wiat tby vase o was created &servis 38 ModeI Aviation Technique rmation e TR 0 used scoring 1983 hays Soaringd continuous op Le ndon threea location adjacent im area aw no evidence re d interference witacknow th 4 Likportabled co ercial ii interfe w C e n d t vi o cassette reco ers ha atAirt oni s abl cou eo s epo ntialto n tingint nd helpful / f enc wi esse y situa reaso TV4 inte wi man tion di t Interference channels th t C rece h pens absolu ly pr table ope te n superhetrodyneen listed few ossib principle rhetrodyne radio oper- ference combinations m col s ates mixing two radio frequencies to- May Juuie 1983 got gether can extract information mail decided lay back d sums differences TV4 sound let nature take its course has FM centered 714 MHz deviating Dual-conversion receivers sh uld n t 10075MHz normal operation have problem TV4 pr blem RC receiver receives TV4 peculiar old-style single-co ersio sound carrier high enough level TV4 superhetrodyne receiver tha ses 455 sound can intermodulate receiv- kHz IF amplifier du rsion ers local oscillator transmissions receivers might have similar oble other RC transmitters way other TV channels Please n te said produces detectable interference might have problems use monitor often hear case doubt turn receiver pulse-modulated TV4 sound track first watch whil e what some RC channel RC happenswhich should no n smitter operating vicinity monitor have demonstrated Next Peter Jacobitz 14113 several clubs using either Airtronics East Boston MA writes monitor others like Lange converter What really frightening about am two-year no RC ask operating RC FM transmit- questions find en ne ter usually AC channel dWferent doesnt know answer hey ge rally being intetfered have say Dont worry abou wh example used Tower Gold 500 re mean dont kn urn transmitter AM RC4O demonstrate TV4 sound FM Or/Wh 72400 ha Tower Gold 500 ystem MHz Airtronics Scanner AM RC48 turn pow RX hadnt noticed RC44 could interfere TX th ervos buzz hatter itself apparently others have twitch Standin feet aw TX As Mark Scheda has correctly observed antenna fully exte ed ru ing hands effect strongest fly close over case ortappi auses avariety TV transmitter less 20 miles awi drops off insignificance greater distances like 45 miles i e s t 1 e e Marks experience have also observe sfl loose insi e interference effect stronger whe r dti1i e eable cryst operating TV set vicini e h somethin within 20 feet tuned TV4 T due fact operating supe tight Faili hetrodyne receiver like TV radiat broken b t something its local oscillator wa before y its antenna observe effect whe th folks try tune two pocket AM radios ow t w same station whistle make i t o u c deduce someone operates TV ourself ed sugges s receiver vehicle flying field send b camper instance might produce interference situation other- A 8 s wise free glitches ton writes .. h tw Personal computers operating h both Futaba is se -c n field have same potential mak JC48 FM othe T n 0 glitches although must report th 1AM Ietsco ir-this 120 &ofl its first outing FM set RC48 Kraft AM radio Blue/White 72160~Jz wagjt back beings Ithough7Ih bad FM receivuntfl7llow c b ember flying RC#M lt interference K1 transmitter RC54 above radios hl good around range Testing own AM radio producec FM set though Kraft radio called Futaba apis technical person disclaimed problem FM radi indicated probable splash AM ra .. could explain sc commentsme tions to problem aircraft airborne 1 intend enlist tne help other club members carry out further testing David J Watson no AMA number given Taylors SC sent copy letter Circus Hobbies reads part . have returned radios five times three times Unlimited 8 twice Century 7 just gave new receiver say aligned test flew Century 7 acting up again Both FM radios give trouble Circus Apollo 6 Circus 4 both A4 radios .. am getting desper\te Five good planes have destroyed becaus radio problems fri dsw uba Kraft dont seem i th se troubles radios p lei4s please tell t m ha can correct proble . scope activities Bob haveNow different kind problem defined reasonable expect RCCarl G Godlewski Westport CT AMA operators43818 writes simplest test 31M desc ecd AMA HQ 9 Jan 1985 last month comprehe e tes Dear Mr Myers program given mn September 984 issue ortunately e e two letters FC ha/ent een tes pos le requestin aprw 4M combinations use am operators lic ] aven need license ired operate avetoextend ra53300 MHz - I sent first request the] about April 1 onths p ed respor miii u e i rs nt co requesttotheFC edflr smitter 1 can n DC have yet toi e e te e afewtr fr m eithe about 600 f eir dio atpteristics jn f dli ns acquired 1 illegal s rs Ouflu t t ning Since ow tha M 5 er requests imitter likely cause ing anay. bu - problem Now will Mosttrepidation li often wont repeat theme keyquate future good receiver summary operators license Should continue t pro FC comatose giant s ep As newcomer h help can give e r h Angel Mendoza no AMA number given writes Huntington Beach CA say .. After reading article Sep tember 1984 issue Model Aviation bought Kraft KP7C system KPR-8FD FM dual-conversion receiver September 1984 column synthesized radio Im sure whatAngel bought suspect KPR-SFDS GMM 1 First session Mile Square OK six flights 2 Next session Sepulveda Basin Bad giitch Landed safely 3 Tests home showed Fu taba RC48 AM would interfere Kraft RC56 FM 4 TX RX modules Kraft As can see doesnt matt manufact rer buy Fts5 Three weeks passed gettingeproblemiswidesd ng session Mile Square six roblem repo a1e c ing freq Next session Throttle out control n ber w FM radiosiceBack Kraft No fix National fllot ofradios hi e6P out business told send itto Arizona market use old si e-conversio kHz IF design except Ha owned super radio 90 days 8FD KPR-8FDS rec ers w i ar -conversion t3rles F r ght y u might interested will know Bob Aberle predicting least th dual-conversion S ne th s uthesized radios got out required meet 1991 con tr istor would pass AM available evidence single-conversi ugh front end Unfortunatesets work well enough themsel s sely\ dropped out domestic RC dozens reports Bob Aberle i lyingprodti,t n business about same time Models magazine reader le rs likwhich S AFUd repair people above susceptible interme vise anyone synthesizer ference operated groups d oblem contact Pete Waters column has offered test pr edu strict VII vice-president 117 time time based deaE aim Upper Level Northville MI similar tests would performe o r48 ry few has readers using normally-availab equthe ool onents training ment So far person has rittQn tserv e sn esizers missed go us about testing an1ck dJj c0lumn March beauty Unfortii 02col3 1984 get tand yJRFM C office 4 Three change life s patient turn over Amate ARRL 225 Mai S 06111whichhassi c s over US s 1eer Examination Coor tivity conducted Clubs iso e 1 first point tact e w supply list lo cl d li testing sessions te 4 advance nib Ultimately FCC Fo ed stamped envelop uired fir take writt st ficiency test o qualify license Said te a VECsforasma f st ts4 forwardedbyth V C eFC later issues 1 csey Amateur Rathcouseare taught Adulc schools th both tests Yo ~ch couple boo r fre address aboveom theco lishing CorpsideAye iton Park NY 115 6eillbe ion answerL e r will theAm te r youthencott e Benton Harb ic offeracodea$ eorycu e cassettes witmpanying 5 iiContinuedo ag38 May 1 letter represi received FC 1* PLANS * TARBGbY 7 cially Turn-around thin 850 sq in. 120 cycle powered Ron Chidgey design templates computer plotted smooth solid performer Rib Plans construction hints $1 195 TIGER TAIL 4 Ron Chidgeys latest best series little larger lighter slower retains honest flight characteristics Its predecess ors Plans construction hInts WELLER 3 BLADE FIBERGLASS PROP proven lh hats Interna tIonal competition 1310 $2000 IVANS MAGIC GADGET protractor device used Ivan Krlatensen accurately measure aileron elevator add rudder throw Takes guess work out trimmIng Out airplane qualIty tool complete Instructions log book carrying case $795 SEE YOUR DEALER OR ORuaK UIRtLI lieve March 1937 plane Frank Tinsley think Loire French gull-wing parasol fightershown rear top quarter climbed toward title have first-issue covers framed am missing father thanks mother thanks thank you. Bill Winter 4432 Altura Ct Fafrfax VA 22030 Editor Bill Winter has granted leave absence producing col unin period time presently determined meantime have hand couple other articles Bill will printed next few months Before anyone jumps wrong conclu sion let make plain hasnt fired arent unhappy him isnt unhappy us let urge readers refrain writing Bill editorial offices about quick resumption Fun column would WING TUBE & SOCKETS Aluminum alloy tubing plug-In wings Included pair special slipfit phenolic sockets build wing structure Now size models 718 die x 3 5 1* die x 2 5 1$ die x 3 5 ENGINE SLEEVE BEARING PULLER Pull tight sleeves bearings easily damage new 00s wIth 1ThW reaL bearing Both SLEEVE PULLER 0795for BEARING PULLER -15$1395 TRANSMITTER CASE An ineepensive rugged molded case protect expensIve transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1695 Qator WC Products 3713 PolapaflO Drive P Paniacola FL 3251$ Phone 90$ $76- 8639 INCLUVE $100 PER ITEM FOR UPS counterproductive rl R Wheeley Tucano/Naber Continued page 36 model cut out LMF painted small brush Using method can get correct scale stars bars etc have use closest-available size decals dont need seal painted-on items coat clear decals have mix special color remember keep small amount touch-ups probably will neces sary later Flying past building flying experiences guess have flown ofjust about popular model avail able Yet initial takeoff newly-completed model always have first flight jitters time no different engine running ship sitting end McDonnell-Douglas clubs asphalt run way time comes have advanced throttle power aircraft ran true down runway actually made nice slow takeoff itself due too much up-eleva tor trim After Tucano climbed flight altitude necessary trim abit down-elevator flew model around about six laps field prepared first landing lowered retract gear added about 25% flaps new model like limit first flight takeoff landing know handles well crucial areas nerves relax little can turn attention various other maneuvers following flights Tucano landed just like Curare Pattern airplane say least quite impressed what developed subsequent flights found due basic long moment arrangement flies smoothly nearly responsively Pattern airplane Landings flat true no tendency drop wing tip extremely low landing speeds first three Sport Scale contests entered Tucano static points right up other top models Everyone has seen fly tells impressed Tucano s looks air What could modeler want Buy big bag balsaand happy building Radio Technique/Myers Continued page 39 als Heath catalog changes time time dont hold against product has discontinued Specifically Radio Telephone oper ators license pilot has con fers license use Aviation Band 109135 MHz does permit use Amateur Radio bands George M Myers 70 Froehlich Farm Rd. Hicksville NY 11801 138 ModelAviation . CW f oo Designed Turnaround Pattern 3de~1 dd ~0O O~Gte le5 tB &MODEL AIRCRAFT 9$~ ex w P0 Box 1902 Greenville TX 75401 2144546441 GONTIOLIKI ThU PROFILE0COMBA 7RA T WIDE & NARROW WEDGE 1 5 6 oz Capacities UNIFLOW & STINDD Custom lieu Fuels Ingredients detailed bochur5OC stomps/check CAROLINATAFFINDER 8345 Delhi Road Charleston Hats. SC 29418 3563-7169
Edition: Model Aviation - 1985/05
Page Numbers: 38, 39, 138
cRdio SOME ANSWERS begin letter Mark Scheda Rochester NY Mr George M Myers AMA Dist #2 Frequency Coordi Dear Mr Myer noteyour attenti situation whicWyou might take est During May June experienced severe interference problems three different occasions using RC44 western NY flying brandnew seven-channel Airtronics Champion ship Series FM transmitter receiver Heres description incidents 1 Flying Grand Island about five miles north Buffalo Severe interference produced crash time convinced interference plane new yet trimmed 2 & 3 Flying Niagara Falls about 15 miles north Buffalo Two sets inter ferencesno crashes 4 Flying Barker about 45 miles northeast Buffalo No interferences After 3 pulled entire system aircraft returned Airtronics did complete check found nothing wrong changed system RC4O note returned radio asking TV4 transmitter Buffalo answer yes note explained TV4 can interfere Airtronics receiver RC44 Since change RC 40 have single problem summer fall 1984 probab ly 10 hours flight time folks Airtronics extremely helpful courteous times both speaking phone written corres nde east com f note oth problIf anio onpart Recheda Fir requires specia edd AMA its official journalI Aviation exist give AMA meopportunity ha wiat tby vase o was created &servis 38 ModeI Aviation Technique rmation e TR 0 used scoring 1983 hays Soaringd continuous op Le ndon threea location adjacent im area aw no evidence re d interference witacknow th 4 Likportabled co ercial ii interfe w C e n d t vi o cassette reco ers ha atAirt oni s abl cou eo s epo ntialto n tingint nd helpful / f enc wi esse y situa reaso TV4 inte wi man tion di t Interference channels th t C rece h pens absolu ly pr table ope te n superhetrodyneen listed few ossib principle rhetrodyne radio oper- ference combinations m col s ates mixing two radio frequencies to- May Juuie 1983 got gether can extract information mail decided lay back d sums differences TV4 sound let nature take its course has FM centered 714 MHz deviating Dual-conversion receivers sh uld n t 10075MHz normal operation have problem TV4 pr blem RC receiver receives TV4 peculiar old-style single-co ersio sound carrier high enough level TV4 superhetrodyne receiver tha ses 455 sound can intermodulate receiv- kHz IF amplifier du rsion ers local oscillator transmissions receivers might have similar oble other RC transmitters way other TV channels Please n te said produces detectable interference might have problems use monitor often hear case doubt turn receiver pulse-modulated TV4 sound track first watch whil e what some RC channel RC happenswhich should no n smitter operating vicinity monitor have demonstrated Next Peter Jacobitz 14113 several clubs using either Airtronics East Boston MA writes monitor others like Lange converter What really frightening about am two-year no RC ask operating RC FM transmit- questions find en ne ter usually AC channel dWferent doesnt know answer hey ge rally being intetfered have say Dont worry abou wh example used Tower Gold 500 re mean dont kn urn transmitter AM RC4O demonstrate TV4 sound FM Or/Wh 72400 ha Tower Gold 500 ystem MHz Airtronics Scanner AM RC48 turn pow RX hadnt noticed RC44 could interfere TX th ervos buzz hatter itself apparently others have twitch Standin feet aw TX As Mark Scheda has correctly observed antenna fully exte ed ru ing hands effect strongest fly close over case ortappi auses avariety TV transmitter less 20 miles awi drops off insignificance greater distances like 45 miles i e s t 1 e e Marks experience have also observe sfl loose insi e interference effect stronger whe r dti1i e eable cryst operating TV set vicini e h somethin within 20 feet tuned TV4 T due fact operating supe tight Faili hetrodyne receiver like TV radiat broken b t something its local oscillator wa before y its antenna observe effect whe th folks try tune two pocket AM radios ow t w same station whistle make i t o u c deduce someone operates TV ourself ed sugges s receiver vehicle flying field send b camper instance might produce interference situation other- A 8 s wise free glitches ton writes .. h tw Personal computers operating h both Futaba is se -c n field have same potential mak JC48 FM othe T n 0 glitches although must report th 1AM Ietsco ir-this 120 &ofl its first outing FM set RC48 Kraft AM radio Blue/White 72160~Jz wagjt back beings Ithough7Ih bad FM receivuntfl7llow c b ember flying RC#M lt interference K1 transmitter RC54 above radios hl good around range Testing own AM radio producec FM set though Kraft radio called Futaba apis technical person disclaimed problem FM radi indicated probable splash AM ra .. could explain sc commentsme tions to problem aircraft airborne 1 intend enlist tne help other club members carry out further testing David J Watson no AMA number given Taylors SC sent copy letter Circus Hobbies reads part . have returned radios five times three times Unlimited 8 twice Century 7 just gave new receiver say aligned test flew Century 7 acting up again Both FM radios give trouble Circus Apollo 6 Circus 4 both A4 radios .. am getting desper\te Five good planes have destroyed becaus radio problems fri dsw uba Kraft dont seem i th se troubles radios p lei4s please tell t m ha can correct proble . scope activities Bob haveNow different kind problem defined reasonable expect RCCarl G Godlewski Westport CT AMA operators43818 writes simplest test 31M desc ecd AMA HQ 9 Jan 1985 last month comprehe e tes Dear Mr Myers program given mn September 984 issue ortunately e e two letters FC ha/ent een tes pos le requestin aprw 4M combinations use am operators lic ] aven need license ired operate avetoextend ra53300 MHz - I sent first request the] about April 1 onths p ed respor miii u e i rs nt co requesttotheFC edflr smitter 1 can n DC have yet toi e e te e afewtr fr m eithe about 600 f eir dio atpteristics jn f dli ns acquired 1 illegal s rs Ouflu t t ning Since ow tha M 5 er requests imitter likely cause ing anay. bu - problem Now will Mosttrepidation li often wont repeat theme keyquate future good receiver summary operators license Should continue t pro FC comatose giant s ep As newcomer h help can give e r h Angel Mendoza no AMA number given writes Huntington Beach CA say .. After reading article Sep tember 1984 issue Model Aviation bought Kraft KP7C system KPR-8FD FM dual-conversion receiver September 1984 column synthesized radio Im sure whatAngel bought suspect KPR-SFDS GMM 1 First session Mile Square OK six flights 2 Next session Sepulveda Basin Bad giitch Landed safely 3 Tests home showed Fu taba RC48 AM would interfere Kraft RC56 FM 4 TX RX modules Kraft As can see doesnt matt manufact rer buy Fts5 Three weeks passed gettingeproblemiswidesd ng session Mile Square six roblem repo a1e c ing freq Next session Throttle out control n ber w FM radiosiceBack Kraft No fix National fllot ofradios hi e6P out business told send itto Arizona market use old si e-conversio kHz IF design except Ha owned super radio 90 days 8FD KPR-8FDS rec ers w i ar -conversion t3rles F r ght y u might interested will know Bob Aberle predicting least th dual-conversion S ne th s uthesized radios got out required meet 1991 con tr istor would pass AM available evidence single-conversi ugh front end Unfortunatesets work well enough themsel s sely\ dropped out domestic RC dozens reports Bob Aberle i lyingprodti,t n business about same time Models magazine reader le rs likwhich S AFUd repair people above susceptible interme vise anyone synthesizer ference operated groups d oblem contact Pete Waters column has offered test pr edu strict VII vice-president 117 time time based deaE aim Upper Level Northville MI similar tests would performe o r48 ry few has readers using normally-availab equthe ool onents training ment So far person has rittQn tserv e sn esizers missed go us about testing an1ck dJj c0lumn March beauty Unfortii 02col3 1984 get tand yJRFM C office 4 Three change life s patient turn over Amate ARRL 225 Mai S 06111whichhassi c s over US s 1eer Examination Coor tivity conducted Clubs iso e 1 first point tact e w supply list lo cl d li testing sessions te 4 advance nib Ultimately FCC Fo ed stamped envelop uired fir take writt st ficiency test o qualify license Said te a VECsforasma f st ts4 forwardedbyth V C eFC later issues 1 csey Amateur Rathcouseare taught Adulc schools th both tests Yo ~ch couple boo r fre address aboveom theco lishing CorpsideAye iton Park NY 115 6eillbe ion answerL e r will theAm te r youthencott e Benton Harb ic offeracodea$ eorycu e cassettes witmpanying 5 iiContinuedo ag38 May 1 letter represi received FC 1* PLANS * TARBGbY 7 cially Turn-around thin 850 sq in. 120 cycle powered Ron Chidgey design templates computer plotted smooth solid performer Rib Plans construction hints $1 195 TIGER TAIL 4 Ron Chidgeys latest best series little larger lighter slower retains honest flight characteristics Its predecess ors Plans construction hInts WELLER 3 BLADE FIBERGLASS PROP proven lh hats Interna tIonal competition 1310 $2000 IVANS MAGIC GADGET protractor device used Ivan Krlatensen accurately measure aileron elevator add rudder throw Takes guess work out trimmIng Out airplane qualIty tool complete Instructions log book carrying case $795 SEE YOUR DEALER OR ORuaK UIRtLI lieve March 1937 plane Frank Tinsley think Loire French gull-wing parasol fightershown rear top quarter climbed toward title have first-issue covers framed am missing father thanks mother thanks thank you. Bill Winter 4432 Altura Ct Fafrfax VA 22030 Editor Bill Winter has granted leave absence producing col unin period time presently determined meantime have hand couple other articles Bill will printed next few months Before anyone jumps wrong conclu sion let make plain hasnt fired arent unhappy him isnt unhappy us let urge readers refrain writing Bill editorial offices about quick resumption Fun column would WING TUBE & SOCKETS Aluminum alloy tubing plug-In wings Included pair special slipfit phenolic sockets build wing structure Now size models 718 die x 3 5 1* die x 2 5 1$ die x 3 5 ENGINE SLEEVE BEARING PULLER Pull tight sleeves bearings easily damage new 00s wIth 1ThW reaL bearing Both SLEEVE PULLER 0795for BEARING PULLER -15$1395 TRANSMITTER CASE An ineepensive rugged molded case protect expensIve transmitter both two stick single stick transmitters Brown leather grain aluminum trim locking clasp $1695 Qator WC Products 3713 PolapaflO Drive P Paniacola FL 3251$ Phone 90$ $76- 8639 INCLUVE $100 PER ITEM FOR UPS counterproductive rl R Wheeley Tucano/Naber Continued page 36 model cut out LMF painted small brush Using method can get correct scale stars bars etc have use closest-available size decals dont need seal painted-on items coat clear decals have mix special color remember keep small amount touch-ups probably will neces sary later Flying past building flying experiences guess have flown ofjust about popular model avail able Yet initial takeoff newly-completed model always have first flight jitters time no different engine running ship sitting end McDonnell-Douglas clubs asphalt run way time comes have advanced throttle power aircraft ran true down runway actually made nice slow takeoff itself due too much up-eleva tor trim After Tucano climbed flight altitude necessary trim abit down-elevator flew model around about six laps field prepared first landing lowered retract gear added about 25% flaps new model like limit first flight takeoff landing know handles well crucial areas nerves relax little can turn attention various other maneuvers following flights Tucano landed just like Curare Pattern airplane say least quite impressed what developed subsequent flights found due basic long moment arrangement flies smoothly nearly responsively Pattern airplane Landings flat true no tendency drop wing tip extremely low landing speeds first three Sport Scale contests entered Tucano static points right up other top models Everyone has seen fly tells impressed Tucano s looks air What could modeler want Buy big bag balsaand happy building Radio Technique/Myers Continued page 39 als Heath catalog changes time time dont hold against product has discontinued Specifically Radio Telephone oper ators license pilot has con fers license use Aviation Band 109135 MHz does permit use Amateur Radio bands George M Myers 70 Froehlich Farm Rd. Hicksville NY 11801 138 ModelAviation . CW f oo Designed Turnaround Pattern 3de~1 dd ~0O O~Gte le5 tB &MODEL AIRCRAFT 9$~ ex w P0 Box 1902 Greenville TX 75401 2144546441 GONTIOLIKI ThU PROFILE0COMBA 7RA T WIDE & NARROW WEDGE 1 5 6 oz Capacities UNIFLOW & STINDD Custom lieu Fuels Ingredients detailed bochur5OC stomps/check CAROLINATAFFINDER 8345 Delhi Road Charleston Hats. SC 29418 3563-7169