Radio Technique George M Myers SRE SRE Study lettersyoull hearing lot about future stand Switchable Radio Fre quency month Im going address subject What about Krafts synthe sized RF system needs synthesized RF generator Mainly RC manufacturers need keep prices down synthesizer uses universal crystal simple com puter replace 160 unique crystals 80 transmitters 80 receivers Soon will making SRF radios Look economics Right now can buy pair Kraft SRF Transmitter Receiver modules tune 50 RC channels $120 over price receiver alone can bet price will go down other manufacturers start producing synthesiz ers Compare price equivalent price 79 extra sets modules modular radio least $2800 79 sets RE decks necessary plugs receiver crystals least $2000 just cost 79 pairs plug-in crystals $800 figure out youll find space needed store Editors note 1991 will 50 aircraft RC channels 30 non-aircraft channels availablea total 80 chan nels Since RC system would normally come crystals/modules chan nel youd need 79 crystals/modules get 80 channels RMcM Kraft SRF module looks big sticking up out transmitter until compare size 50 crystals switch access Next will get smaller go inside transmitter Sure individual can get RC channel eco nomics described above must support ed stocks dealers shelves manufacturers inventory ties up money money costs money too closer get 1991 80 channels economic pres sure will push manufacturers toward use synthesizer Watch see Testing RC equipment Recently Bob Aberle 48 other people around United States including received prototype Kraft synthesized-RE transmit ter modules receivers test evaluation What actually received test tools no reviewer can time forward equipment reviews taken seriously same time accepted responsibility comprehensive testing SRE equipment report results honestly may few readers know Bob Aberle cooperate time time testing new radio systems approach emphasizes use equip ment available Avera2e Weekend 42 Model Aviation Georges Curare now carries Kraft KPR-8FDS FM receiver 5 receivers ID code tells us has new Synthesized Fre quency featureIt can tune 49 RC channels flip couple thumbwheeis Kraft Signature transmitter usually used control Georges helicopters sports Synthesized Frequency module atop case too can set 49 new RC channels setting two selector wheels monocolor red transmitter flag suggested George use SRF Switchabie Radio Frequen cy sets frequency IDa tell us set RC5O photo taken Yesyou can fly stiff-wing plane Hell-radio George says degraded mode operation Three modelers ganging up air plane takes three transmitters Third Order intermodulatlon interference test case Dan Kahn L Tom Hunt Bob Aberle R preparing administer Bobs Next Step test plane airborne testing like done small light expendable model asto min imize possible damage event uncontrollable anomaly encountered course test Flier assumption anyone wants duplicate tests should able long willing little work sometimes buy lit tle inexpensive test equipment need sophisticated test equipment depend Dan Kahn has bunch expensive HP equipment wont need Nobody asked information tests usually perform explanations Some tests inventions others given us people know about radio systems tests listed proper sequence In-flight direct interference test simulate careless modeler body worries about what believe represents normal set field conditions us flies test plane around 50 100 feet altitude other keeping eyes plane finger transmitter switch times turns ON transmitter same channel first sign trouble interference turned OFF have trust another things like We try assemble enough transmitters can test AM against AM AM/FM AM/PCM FM/PCM FM/FM requires lot borrowing preceding list test pairs test objective necessarily accomplishment Bob has some special test modules Kraft Signature transmitter have some special test RF decks Ace RC Silver Seven Between us able assem ble borrow enough AM FM trans mitters necessary channels get work done Since neither us has Futaba PCM test sometime thing point Im making get stuff done lot help friends -flight JO kHz adjacent-channel inter ference test simulate inter ference can appear new RC channels someone uses Canadi set crystals someone tries fly too close Common Carrier tenna field within mile also simulate 1988 interference will occur some cheapskate decides continue using old crystals beyond FCCmandated cutoff date test-equipment operator stands about 30 feet away first moves up alongside flier simulate Continued page 145 September 1984 43 Talk about new oldi Norm Rosenstock holding deBolt Rebel built Bill Winter back SIxties AMA number Bills look transmitter Norm hoidingi latests Kraft SRF setand Rebel has matching receiver Inside ins urn- moaume piugs mb mop OT uuorguu new rft Hell-radio transmitter Mk IV small metered box just above transmitter clip-on RF field-strength meter merly made RS Systems George thinks RCers should have field-strength meter Plan attend Sixth Annual Greater Michigan Modelers Show Exposition Benjamin F Yack Recreation Center 3131 Third Street Wyandotte Michigan August 24 25 & 26 PREMIER SHOWPLACE model airplanes gliders rockets cars trucks military vehicles power boats sailboats First second third place awards will given winners radio-control control-line free flight plastic static display categories MANUFACTURERS EXHIBITS NSTRATIONS Swap Shop les eshments Parking shieldstriking Bayles face caus ing him puii back stick Grannie studied film footage frame-by-frame could see something headed windshield just before nose came up Two young boys brought gas cap Bayles goggles found course some distance crash occurred no way goggles Bayles always wore could have left enclosed cockpit unless canopy shattered ended short spectacular story fantastic aircraft air racing history Granville organization would go spectacular air racing achieve ments beautiful ghost City Springfield would some day return city name bore another celebration Bill Turner brought recreation Model Z 50th Anniversary Gee Bee Celebration few years ago another story continued Radio TechniquslMyor Continued page 43 Pylon Racing situation pilots start dueling antennas put test antenna about foot filers transmitter antenna crossing middle perpendicular rotate test antenna until parallel fliers transmitter antenna plane still flying sweep test -flight 20 kHz adjacent-channel inter ference simulate 1991 flying us ing now Kraft SRF trans mitter modules test transmitter antenna moved around duplicate 10 kHz adja cent-channel test -flight 40kHz adjacent-channel inter ference simulate 1983-87 flying using either transmitters old fre quencies new RC channels aircraft test-transmitter antenna moved around duplicate 10 kHz adja cent-channel test Third-order intermodulation inter ference ground test simulate situation three pilots standing too close together plane taxiing under some elses transmitter antenna Using transmitters three new RC channels sequence eg RC5O RC52 RC54 will air planes control transmitter well have three operators stand line 30 feet airplane transmitter antennas held parallel airplanes receiver antenna systems will ON two test transmitter operators will walk slowly toward airplane keeping transmitter antennas parallel Phase-glitch ground test neighboring transmitters turned OFF turn test system ON extend its antenna holding transmitter antenna parallel ground walk around airplane pivoting around tip transmitter antenna held more-or-less fixed space three feet above airplane watch servo jitters In-flight range test airplane maximum altitude distance conditions us collapses control transmitter antenna until either plane shows loss control antenna completely collapsed guy doing antenna work has keep out pilots line sight prepared times yank antenna out hurry pulling apart In-flight weak signal adjacent-channel interference tests repeat adjacent-channel tests above add In-flight Range test Its lot work Power output tests qualitative test just sure power outputs more-or-less equal use RS clip-on Field Strength Meter have Continued page 148 September 1984 145 Hosted Indian City Radio Control Club antenna around pilots body likebefore will record tne distance airport frisk operationwhich servos airplane start jitter test data shown times before Its out pro duction everyone should have some kind field strength meter Capture Ratio FM test peculiarity FM receiver stays tuned its control trans mitter signal until another similar trans mitter exactly same radio frequen cy presents stronger signal time control transfers interfering transmitter control transmitter set up 30 feet airplane receiver ground system turned ON interfer er must similar FM transmit ter sent further away turned ON test operator walks interferer until receiver captured relative distances between plane transmitters noted Monitoring Using John Lange con verter has described column several times check envi ronment see what flying usually sweep way across band before testing starts again after finished have some unex plained funnies Discussion jest results OK now have idea Kraft Synthesized SRF Switchable Radio Frequency sys tems tested want know results nutshell Kraft ready 1984 right now ready 1991 gets theyre also ready year between SRF systems passed tests No problems found used required AMA Phase-In Plan SRF 10-sanctionedRC-channel system because cant ac cess old frequencies 7208-7296 7564 MHz accesses new sanc tioned RC channels RCl2 RC38 RC42 RC44 RC46 RC48 RC5O RC52 RC54 RC56 technical reasons can use RC4O Ten channels adequate situations think have will become 22-sanctioned-RC-channel system December 20 1987 requiring anything make changes SRF modules date use old RC frequencies will cease AMA will activate RCl4 RCl6 RCl8 RC20 RC22 RC24 RC26 RC28 RC3O RC32 RC34 RC36 places aircraft December 20 1990 Kraft SRF will become 49-sanctioned-RC-channel system again requiring take action used SRF system channel adjacent existing old fre quency eg using 72250 MHz old Red/White 72240 MHz found SRF precise Kraft sets within 100 Hz marked frequen cy narrow-banded SRF system wont interfere suffer terference old system consider legal crystal toler ance old system can put 1800 Hz off its nominal frequency remember channel spacing talking about 10000 Hz result pretty clear ly shows SRF isnt threat some people took curiosity illustrating precision Kraft SRF system has noted several people Kraft SRF transmitter part FM system uses same KPR-8FD re ceiver reported last year often will fly crystal-controlled KPR-8FD receiver same channel RC52 case reason given specially-chosen matched pairs crystals Kraft used last year best available time werent precise enough match precisiontuning narrow-band SRF transmit ters What does tell about potential making interference synthesized transmitter Meanwhile should bear mind AMA Phase-In Plan considers other forms mutual interference well tested SRF systems did produce some ticipated interferences although very reduced level AMA-sanctioned MERICAN JUNIOR AJI Balsa Model Airplanes Whip-power U-Control Flrebaby II 020-049 Jr Fireball 049-090 OMING SOON -404 Interceptor Folding Wing Glider See favorite hobby dealer Write American Jr Heritage Models Inc PO Box 505 Donald Oregon 97020 channels chosen avoid prob lems AMA Phase-In Plan will followed through 1990 scheduled reason Conclusions tests tell us want Kraft SRF system planes Image-frequency problems RC band disappear can forget about traveling distant site find radio have plane cant used because local interference No standing end long line other RC channels empty waiting used No watching everybody fly off thermals cant reach because frequency being used No 2-plane heats just fill out rac ing schedule Pylon Quickee love George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Building BoardlHaught Continued page 45 finished door quick construction Being screwed together rather nailed makes easy disassemble few minutes stash away closet spare room needs used guests items incorporated meet requirements So far am quite pleased results Construction drawing shows materials required build table 36 wide 60 long prac tical size models size can easily altered fit building program selecting wood keep mind finished product want sharp looking table buy cedar 2 x 4s give varnish finish looking practical model choose good pine stock table built out structural 2 x 4s very inexpensive still good solid table top important part Choose care Doors can found finished unfinished solid hollow core solid doors best also expensive hard 148 Model Aviation Radio TechniquelMyor Continued page 145
Edition: Model Aviation - 1984/09
Page Numbers: 42, 43, 145, 148
Radio Technique George M Myers SRE SRE Study lettersyoull hearing lot about future stand Switchable Radio Fre quency month Im going address subject What about Krafts synthe sized RF system needs synthesized RF generator Mainly RC manufacturers need keep prices down synthesizer uses universal crystal simple com puter replace 160 unique crystals 80 transmitters 80 receivers Soon will making SRF radios Look economics Right now can buy pair Kraft SRF Transmitter Receiver modules tune 50 RC channels $120 over price receiver alone can bet price will go down other manufacturers start producing synthesiz ers Compare price equivalent price 79 extra sets modules modular radio least $2800 79 sets RE decks necessary plugs receiver crystals least $2000 just cost 79 pairs plug-in crystals $800 figure out youll find space needed store Editors note 1991 will 50 aircraft RC channels 30 non-aircraft channels availablea total 80 chan nels Since RC system would normally come crystals/modules chan nel youd need 79 crystals/modules get 80 channels RMcM Kraft SRF module looks big sticking up out transmitter until compare size 50 crystals switch access Next will get smaller go inside transmitter Sure individual can get RC channel eco nomics described above must support ed stocks dealers shelves manufacturers inventory ties up money money costs money too closer get 1991 80 channels economic pres sure will push manufacturers toward use synthesizer Watch see Testing RC equipment Recently Bob Aberle 48 other people around United States including received prototype Kraft synthesized-RE transmit ter modules receivers test evaluation What actually received test tools no reviewer can time forward equipment reviews taken seriously same time accepted responsibility comprehensive testing SRE equipment report results honestly may few readers know Bob Aberle cooperate time time testing new radio systems approach emphasizes use equip ment available Avera2e Weekend 42 Model Aviation Georges Curare now carries Kraft KPR-8FDS FM receiver 5 receivers ID code tells us has new Synthesized Fre quency featureIt can tune 49 RC channels flip couple thumbwheeis Kraft Signature transmitter usually used control Georges helicopters sports Synthesized Frequency module atop case too can set 49 new RC channels setting two selector wheels monocolor red transmitter flag suggested George use SRF Switchabie Radio Frequen cy sets frequency IDa tell us set RC5O photo taken Yesyou can fly stiff-wing plane Hell-radio George says degraded mode operation Three modelers ganging up air plane takes three transmitters Third Order intermodulatlon interference test case Dan Kahn L Tom Hunt Bob Aberle R preparing administer Bobs Next Step test plane airborne testing like done small light expendable model asto min imize possible damage event uncontrollable anomaly encountered course test Flier assumption anyone wants duplicate tests should able long willing little work sometimes buy lit tle inexpensive test equipment need sophisticated test equipment depend Dan Kahn has bunch expensive HP equipment wont need Nobody asked information tests usually perform explanations Some tests inventions others given us people know about radio systems tests listed proper sequence In-flight direct interference test simulate careless modeler body worries about what believe represents normal set field conditions us flies test plane around 50 100 feet altitude other keeping eyes plane finger transmitter switch times turns ON transmitter same channel first sign trouble interference turned OFF have trust another things like We try assemble enough transmitters can test AM against AM AM/FM AM/PCM FM/PCM FM/FM requires lot borrowing preceding list test pairs test objective necessarily accomplishment Bob has some special test modules Kraft Signature transmitter have some special test RF decks Ace RC Silver Seven Between us able assem ble borrow enough AM FM trans mitters necessary channels get work done Since neither us has Futaba PCM test sometime thing point Im making get stuff done lot help friends -flight JO kHz adjacent-channel inter ference test simulate inter ference can appear new RC channels someone uses Canadi set crystals someone tries fly too close Common Carrier tenna field within mile also simulate 1988 interference will occur some cheapskate decides continue using old crystals beyond FCCmandated cutoff date test-equipment operator stands about 30 feet away first moves up alongside flier simulate Continued page 145 September 1984 43 Talk about new oldi Norm Rosenstock holding deBolt Rebel built Bill Winter back SIxties AMA number Bills look transmitter Norm hoidingi latests Kraft SRF setand Rebel has matching receiver Inside ins urn- moaume piugs mb mop OT uuorguu new rft Hell-radio transmitter Mk IV small metered box just above transmitter clip-on RF field-strength meter merly made RS Systems George thinks RCers should have field-strength meter Plan attend Sixth Annual Greater Michigan Modelers Show Exposition Benjamin F Yack Recreation Center 3131 Third Street Wyandotte Michigan August 24 25 & 26 PREMIER SHOWPLACE model airplanes gliders rockets cars trucks military vehicles power boats sailboats First second third place awards will given winners radio-control control-line free flight plastic static display categories MANUFACTURERS EXHIBITS NSTRATIONS Swap Shop les eshments Parking shieldstriking Bayles face caus ing him puii back stick Grannie studied film footage frame-by-frame could see something headed windshield just before nose came up Two young boys brought gas cap Bayles goggles found course some distance crash occurred no way goggles Bayles always wore could have left enclosed cockpit unless canopy shattered ended short spectacular story fantastic aircraft air racing history Granville organization would go spectacular air racing achieve ments beautiful ghost City Springfield would some day return city name bore another celebration Bill Turner brought recreation Model Z 50th Anniversary Gee Bee Celebration few years ago another story continued Radio TechniquslMyor Continued page 43 Pylon Racing situation pilots start dueling antennas put test antenna about foot filers transmitter antenna crossing middle perpendicular rotate test antenna until parallel fliers transmitter antenna plane still flying sweep test -flight 20 kHz adjacent-channel inter ference simulate 1991 flying us ing now Kraft SRF trans mitter modules test transmitter antenna moved around duplicate 10 kHz adja cent-channel test -flight 40kHz adjacent-channel inter ference simulate 1983-87 flying using either transmitters old fre quencies new RC channels aircraft test-transmitter antenna moved around duplicate 10 kHz adja cent-channel test Third-order intermodulation inter ference ground test simulate situation three pilots standing too close together plane taxiing under some elses transmitter antenna Using transmitters three new RC channels sequence eg RC5O RC52 RC54 will air planes control transmitter well have three operators stand line 30 feet airplane transmitter antennas held parallel airplanes receiver antenna systems will ON two test transmitter operators will walk slowly toward airplane keeping transmitter antennas parallel Phase-glitch ground test neighboring transmitters turned OFF turn test system ON extend its antenna holding transmitter antenna parallel ground walk around airplane pivoting around tip transmitter antenna held more-or-less fixed space three feet above airplane watch servo jitters In-flight range test airplane maximum altitude distance conditions us collapses control transmitter antenna until either plane shows loss control antenna completely collapsed guy doing antenna work has keep out pilots line sight prepared times yank antenna out hurry pulling apart In-flight weak signal adjacent-channel interference tests repeat adjacent-channel tests above add In-flight Range test Its lot work Power output tests qualitative test just sure power outputs more-or-less equal use RS clip-on Field Strength Meter have Continued page 148 September 1984 145 Hosted Indian City Radio Control Club antenna around pilots body likebefore will record tne distance airport frisk operationwhich servos airplane start jitter test data shown times before Its out pro duction everyone should have some kind field strength meter Capture Ratio FM test peculiarity FM receiver stays tuned its control trans mitter signal until another similar trans mitter exactly same radio frequen cy presents stronger signal time control transfers interfering transmitter control transmitter set up 30 feet airplane receiver ground system turned ON interfer er must similar FM transmit ter sent further away turned ON test operator walks interferer until receiver captured relative distances between plane transmitters noted Monitoring Using John Lange con verter has described column several times check envi ronment see what flying usually sweep way across band before testing starts again after finished have some unex plained funnies Discussion jest results OK now have idea Kraft Synthesized SRF Switchable Radio Frequency sys tems tested want know results nutshell Kraft ready 1984 right now ready 1991 gets theyre also ready year between SRF systems passed tests No problems found used required AMA Phase-In Plan SRF 10-sanctionedRC-channel system because cant ac cess old frequencies 7208-7296 7564 MHz accesses new sanc tioned RC channels RCl2 RC38 RC42 RC44 RC46 RC48 RC5O RC52 RC54 RC56 technical reasons can use RC4O Ten channels adequate situations think have will become 22-sanctioned-RC-channel system December 20 1987 requiring anything make changes SRF modules date use old RC frequencies will cease AMA will activate RCl4 RCl6 RCl8 RC20 RC22 RC24 RC26 RC28 RC3O RC32 RC34 RC36 places aircraft December 20 1990 Kraft SRF will become 49-sanctioned-RC-channel system again requiring take action used SRF system channel adjacent existing old fre quency eg using 72250 MHz old Red/White 72240 MHz found SRF precise Kraft sets within 100 Hz marked frequen cy narrow-banded SRF system wont interfere suffer terference old system consider legal crystal toler ance old system can put 1800 Hz off its nominal frequency remember channel spacing talking about 10000 Hz result pretty clear ly shows SRF isnt threat some people took curiosity illustrating precision Kraft SRF system has noted several people Kraft SRF transmitter part FM system uses same KPR-8FD re ceiver reported last year often will fly crystal-controlled KPR-8FD receiver same channel RC52 case reason given specially-chosen matched pairs crystals Kraft used last year best available time werent precise enough match precisiontuning narrow-band SRF transmit ters What does tell about potential making interference synthesized transmitter Meanwhile should bear mind AMA Phase-In Plan considers other forms mutual interference well tested SRF systems did produce some ticipated interferences although very reduced level AMA-sanctioned MERICAN JUNIOR AJI Balsa Model Airplanes Whip-power U-Control Flrebaby II 020-049 Jr Fireball 049-090 OMING SOON -404 Interceptor Folding Wing Glider See favorite hobby dealer Write American Jr Heritage Models Inc PO Box 505 Donald Oregon 97020 channels chosen avoid prob lems AMA Phase-In Plan will followed through 1990 scheduled reason Conclusions tests tell us want Kraft SRF system planes Image-frequency problems RC band disappear can forget about traveling distant site find radio have plane cant used because local interference No standing end long line other RC channels empty waiting used No watching everybody fly off thermals cant reach because frequency being used No 2-plane heats just fill out rac ing schedule Pylon Quickee love George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Building BoardlHaught Continued page 45 finished door quick construction Being screwed together rather nailed makes easy disassemble few minutes stash away closet spare room needs used guests items incorporated meet requirements So far am quite pleased results Construction drawing shows materials required build table 36 wide 60 long prac tical size models size can easily altered fit building program selecting wood keep mind finished product want sharp looking table buy cedar 2 x 4s give varnish finish looking practical model choose good pine stock table built out structural 2 x 4s very inexpensive still good solid table top important part Choose care Doors can found finished unfinished solid hollow core solid doors best also expensive hard 148 Model Aviation Radio TechniquelMyor Continued page 145
Edition: Model Aviation - 1984/09
Page Numbers: 42, 43, 145, 148
Radio Technique George M Myers SRE SRE Study lettersyoull hearing lot about future stand Switchable Radio Fre quency month Im going address subject What about Krafts synthe sized RF system needs synthesized RF generator Mainly RC manufacturers need keep prices down synthesizer uses universal crystal simple com puter replace 160 unique crystals 80 transmitters 80 receivers Soon will making SRF radios Look economics Right now can buy pair Kraft SRF Transmitter Receiver modules tune 50 RC channels $120 over price receiver alone can bet price will go down other manufacturers start producing synthesiz ers Compare price equivalent price 79 extra sets modules modular radio least $2800 79 sets RE decks necessary plugs receiver crystals least $2000 just cost 79 pairs plug-in crystals $800 figure out youll find space needed store Editors note 1991 will 50 aircraft RC channels 30 non-aircraft channels availablea total 80 chan nels Since RC system would normally come crystals/modules chan nel youd need 79 crystals/modules get 80 channels RMcM Kraft SRF module looks big sticking up out transmitter until compare size 50 crystals switch access Next will get smaller go inside transmitter Sure individual can get RC channel eco nomics described above must support ed stocks dealers shelves manufacturers inventory ties up money money costs money too closer get 1991 80 channels economic pres sure will push manufacturers toward use synthesizer Watch see Testing RC equipment Recently Bob Aberle 48 other people around United States including received prototype Kraft synthesized-RE transmit ter modules receivers test evaluation What actually received test tools no reviewer can time forward equipment reviews taken seriously same time accepted responsibility comprehensive testing SRE equipment report results honestly may few readers know Bob Aberle cooperate time time testing new radio systems approach emphasizes use equip ment available Avera2e Weekend 42 Model Aviation Georges Curare now carries Kraft KPR-8FDS FM receiver 5 receivers ID code tells us has new Synthesized Fre quency featureIt can tune 49 RC channels flip couple thumbwheeis Kraft Signature transmitter usually used control Georges helicopters sports Synthesized Frequency module atop case too can set 49 new RC channels setting two selector wheels monocolor red transmitter flag suggested George use SRF Switchabie Radio Frequen cy sets frequency IDa tell us set RC5O photo taken Yesyou can fly stiff-wing plane Hell-radio George says degraded mode operation Three modelers ganging up air plane takes three transmitters Third Order intermodulatlon interference test case Dan Kahn L Tom Hunt Bob Aberle R preparing administer Bobs Next Step test plane airborne testing like done small light expendable model asto min imize possible damage event uncontrollable anomaly encountered course test Flier assumption anyone wants duplicate tests should able long willing little work sometimes buy lit tle inexpensive test equipment need sophisticated test equipment depend Dan Kahn has bunch expensive HP equipment wont need Nobody asked information tests usually perform explanations Some tests inventions others given us people know about radio systems tests listed proper sequence In-flight direct interference test simulate careless modeler body worries about what believe represents normal set field conditions us flies test plane around 50 100 feet altitude other keeping eyes plane finger transmitter switch times turns ON transmitter same channel first sign trouble interference turned OFF have trust another things like We try assemble enough transmitters can test AM against AM AM/FM AM/PCM FM/PCM FM/FM requires lot borrowing preceding list test pairs test objective necessarily accomplishment Bob has some special test modules Kraft Signature transmitter have some special test RF decks Ace RC Silver Seven Between us able assem ble borrow enough AM FM trans mitters necessary channels get work done Since neither us has Futaba PCM test sometime thing point Im making get stuff done lot help friends -flight JO kHz adjacent-channel inter ference test simulate inter ference can appear new RC channels someone uses Canadi set crystals someone tries fly too close Common Carrier tenna field within mile also simulate 1988 interference will occur some cheapskate decides continue using old crystals beyond FCCmandated cutoff date test-equipment operator stands about 30 feet away first moves up alongside flier simulate Continued page 145 September 1984 43 Talk about new oldi Norm Rosenstock holding deBolt Rebel built Bill Winter back SIxties AMA number Bills look transmitter Norm hoidingi latests Kraft SRF setand Rebel has matching receiver Inside ins urn- moaume piugs mb mop OT uuorguu new rft Hell-radio transmitter Mk IV small metered box just above transmitter clip-on RF field-strength meter merly made RS Systems George thinks RCers should have field-strength meter Plan attend Sixth Annual Greater Michigan Modelers Show Exposition Benjamin F Yack Recreation Center 3131 Third Street Wyandotte Michigan August 24 25 & 26 PREMIER SHOWPLACE model airplanes gliders rockets cars trucks military vehicles power boats sailboats First second third place awards will given winners radio-control control-line free flight plastic static display categories MANUFACTURERS EXHIBITS NSTRATIONS Swap Shop les eshments Parking shieldstriking Bayles face caus ing him puii back stick Grannie studied film footage frame-by-frame could see something headed windshield just before nose came up Two young boys brought gas cap Bayles goggles found course some distance crash occurred no way goggles Bayles always wore could have left enclosed cockpit unless canopy shattered ended short spectacular story fantastic aircraft air racing history Granville organization would go spectacular air racing achieve ments beautiful ghost City Springfield would some day return city name bore another celebration Bill Turner brought recreation Model Z 50th Anniversary Gee Bee Celebration few years ago another story continued Radio TechniquslMyor Continued page 43 Pylon Racing situation pilots start dueling antennas put test antenna about foot filers transmitter antenna crossing middle perpendicular rotate test antenna until parallel fliers transmitter antenna plane still flying sweep test -flight 20 kHz adjacent-channel inter ference simulate 1991 flying us ing now Kraft SRF trans mitter modules test transmitter antenna moved around duplicate 10 kHz adja cent-channel test -flight 40kHz adjacent-channel inter ference simulate 1983-87 flying using either transmitters old fre quencies new RC channels aircraft test-transmitter antenna moved around duplicate 10 kHz adja cent-channel test Third-order intermodulation inter ference ground test simulate situation three pilots standing too close together plane taxiing under some elses transmitter antenna Using transmitters three new RC channels sequence eg RC5O RC52 RC54 will air planes control transmitter well have three operators stand line 30 feet airplane transmitter antennas held parallel airplanes receiver antenna systems will ON two test transmitter operators will walk slowly toward airplane keeping transmitter antennas parallel Phase-glitch ground test neighboring transmitters turned OFF turn test system ON extend its antenna holding transmitter antenna parallel ground walk around airplane pivoting around tip transmitter antenna held more-or-less fixed space three feet above airplane watch servo jitters In-flight range test airplane maximum altitude distance conditions us collapses control transmitter antenna until either plane shows loss control antenna completely collapsed guy doing antenna work has keep out pilots line sight prepared times yank antenna out hurry pulling apart In-flight weak signal adjacent-channel interference tests repeat adjacent-channel tests above add In-flight Range test Its lot work Power output tests qualitative test just sure power outputs more-or-less equal use RS clip-on Field Strength Meter have Continued page 148 September 1984 145 Hosted Indian City Radio Control Club antenna around pilots body likebefore will record tne distance airport frisk operationwhich servos airplane start jitter test data shown times before Its out pro duction everyone should have some kind field strength meter Capture Ratio FM test peculiarity FM receiver stays tuned its control trans mitter signal until another similar trans mitter exactly same radio frequen cy presents stronger signal time control transfers interfering transmitter control transmitter set up 30 feet airplane receiver ground system turned ON interfer er must similar FM transmit ter sent further away turned ON test operator walks interferer until receiver captured relative distances between plane transmitters noted Monitoring Using John Lange con verter has described column several times check envi ronment see what flying usually sweep way across band before testing starts again after finished have some unex plained funnies Discussion jest results OK now have idea Kraft Synthesized SRF Switchable Radio Frequency sys tems tested want know results nutshell Kraft ready 1984 right now ready 1991 gets theyre also ready year between SRF systems passed tests No problems found used required AMA Phase-In Plan SRF 10-sanctionedRC-channel system because cant ac cess old frequencies 7208-7296 7564 MHz accesses new sanc tioned RC channels RCl2 RC38 RC42 RC44 RC46 RC48 RC5O RC52 RC54 RC56 technical reasons can use RC4O Ten channels adequate situations think have will become 22-sanctioned-RC-channel system December 20 1987 requiring anything make changes SRF modules date use old RC frequencies will cease AMA will activate RCl4 RCl6 RCl8 RC20 RC22 RC24 RC26 RC28 RC3O RC32 RC34 RC36 places aircraft December 20 1990 Kraft SRF will become 49-sanctioned-RC-channel system again requiring take action used SRF system channel adjacent existing old fre quency eg using 72250 MHz old Red/White 72240 MHz found SRF precise Kraft sets within 100 Hz marked frequen cy narrow-banded SRF system wont interfere suffer terference old system consider legal crystal toler ance old system can put 1800 Hz off its nominal frequency remember channel spacing talking about 10000 Hz result pretty clear ly shows SRF isnt threat some people took curiosity illustrating precision Kraft SRF system has noted several people Kraft SRF transmitter part FM system uses same KPR-8FD re ceiver reported last year often will fly crystal-controlled KPR-8FD receiver same channel RC52 case reason given specially-chosen matched pairs crystals Kraft used last year best available time werent precise enough match precisiontuning narrow-band SRF transmit ters What does tell about potential making interference synthesized transmitter Meanwhile should bear mind AMA Phase-In Plan considers other forms mutual interference well tested SRF systems did produce some ticipated interferences although very reduced level AMA-sanctioned MERICAN JUNIOR AJI Balsa Model Airplanes Whip-power U-Control Flrebaby II 020-049 Jr Fireball 049-090 OMING SOON -404 Interceptor Folding Wing Glider See favorite hobby dealer Write American Jr Heritage Models Inc PO Box 505 Donald Oregon 97020 channels chosen avoid prob lems AMA Phase-In Plan will followed through 1990 scheduled reason Conclusions tests tell us want Kraft SRF system planes Image-frequency problems RC band disappear can forget about traveling distant site find radio have plane cant used because local interference No standing end long line other RC channels empty waiting used No watching everybody fly off thermals cant reach because frequency being used No 2-plane heats just fill out rac ing schedule Pylon Quickee love George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Building BoardlHaught Continued page 45 finished door quick construction Being screwed together rather nailed makes easy disassemble few minutes stash away closet spare room needs used guests items incorporated meet requirements So far am quite pleased results Construction drawing shows materials required build table 36 wide 60 long prac tical size models size can easily altered fit building program selecting wood keep mind finished product want sharp looking table buy cedar 2 x 4s give varnish finish looking practical model choose good pine stock table built out structural 2 x 4s very inexpensive still good solid table top important part Choose care Doors can found finished unfinished solid hollow core solid doors best also expensive hard 148 Model Aviation Radio TechniquelMyor Continued page 145
Edition: Model Aviation - 1984/09
Page Numbers: 42, 43, 145, 148
Radio Technique George M Myers SRE SRE Study lettersyoull hearing lot about future stand Switchable Radio Fre quency month Im going address subject What about Krafts synthe sized RF system needs synthesized RF generator Mainly RC manufacturers need keep prices down synthesizer uses universal crystal simple com puter replace 160 unique crystals 80 transmitters 80 receivers Soon will making SRF radios Look economics Right now can buy pair Kraft SRF Transmitter Receiver modules tune 50 RC channels $120 over price receiver alone can bet price will go down other manufacturers start producing synthesiz ers Compare price equivalent price 79 extra sets modules modular radio least $2800 79 sets RE decks necessary plugs receiver crystals least $2000 just cost 79 pairs plug-in crystals $800 figure out youll find space needed store Editors note 1991 will 50 aircraft RC channels 30 non-aircraft channels availablea total 80 chan nels Since RC system would normally come crystals/modules chan nel youd need 79 crystals/modules get 80 channels RMcM Kraft SRF module looks big sticking up out transmitter until compare size 50 crystals switch access Next will get smaller go inside transmitter Sure individual can get RC channel eco nomics described above must support ed stocks dealers shelves manufacturers inventory ties up money money costs money too closer get 1991 80 channels economic pres sure will push manufacturers toward use synthesizer Watch see Testing RC equipment Recently Bob Aberle 48 other people around United States including received prototype Kraft synthesized-RE transmit ter modules receivers test evaluation What actually received test tools no reviewer can time forward equipment reviews taken seriously same time accepted responsibility comprehensive testing SRE equipment report results honestly may few readers know Bob Aberle cooperate time time testing new radio systems approach emphasizes use equip ment available Avera2e Weekend 42 Model Aviation Georges Curare now carries Kraft KPR-8FDS FM receiver 5 receivers ID code tells us has new Synthesized Fre quency featureIt can tune 49 RC channels flip couple thumbwheeis Kraft Signature transmitter usually used control Georges helicopters sports Synthesized Frequency module atop case too can set 49 new RC channels setting two selector wheels monocolor red transmitter flag suggested George use SRF Switchabie Radio Frequen cy sets frequency IDa tell us set RC5O photo taken Yesyou can fly stiff-wing plane Hell-radio George says degraded mode operation Three modelers ganging up air plane takes three transmitters Third Order intermodulatlon interference test case Dan Kahn L Tom Hunt Bob Aberle R preparing administer Bobs Next Step test plane airborne testing like done small light expendable model asto min imize possible damage event uncontrollable anomaly encountered course test Flier assumption anyone wants duplicate tests should able long willing little work sometimes buy lit tle inexpensive test equipment need sophisticated test equipment depend Dan Kahn has bunch expensive HP equipment wont need Nobody asked information tests usually perform explanations Some tests inventions others given us people know about radio systems tests listed proper sequence In-flight direct interference test simulate careless modeler body worries about what believe represents normal set field conditions us flies test plane around 50 100 feet altitude other keeping eyes plane finger transmitter switch times turns ON transmitter same channel first sign trouble interference turned OFF have trust another things like We try assemble enough transmitters can test AM against AM AM/FM AM/PCM FM/PCM FM/FM requires lot borrowing preceding list test pairs test objective necessarily accomplishment Bob has some special test modules Kraft Signature transmitter have some special test RF decks Ace RC Silver Seven Between us able assem ble borrow enough AM FM trans mitters necessary channels get work done Since neither us has Futaba PCM test sometime thing point Im making get stuff done lot help friends -flight JO kHz adjacent-channel inter ference test simulate inter ference can appear new RC channels someone uses Canadi set crystals someone tries fly too close Common Carrier tenna field within mile also simulate 1988 interference will occur some cheapskate decides continue using old crystals beyond FCCmandated cutoff date test-equipment operator stands about 30 feet away first moves up alongside flier simulate Continued page 145 September 1984 43 Talk about new oldi Norm Rosenstock holding deBolt Rebel built Bill Winter back SIxties AMA number Bills look transmitter Norm hoidingi latests Kraft SRF setand Rebel has matching receiver Inside ins urn- moaume piugs mb mop OT uuorguu new rft Hell-radio transmitter Mk IV small metered box just above transmitter clip-on RF field-strength meter merly made RS Systems George thinks RCers should have field-strength meter Plan attend Sixth Annual Greater Michigan Modelers Show Exposition Benjamin F Yack Recreation Center 3131 Third Street Wyandotte Michigan August 24 25 & 26 PREMIER SHOWPLACE model airplanes gliders rockets cars trucks military vehicles power boats sailboats First second third place awards will given winners radio-control control-line free flight plastic static display categories MANUFACTURERS EXHIBITS NSTRATIONS Swap Shop les eshments Parking shieldstriking Bayles face caus ing him puii back stick Grannie studied film footage frame-by-frame could see something headed windshield just before nose came up Two young boys brought gas cap Bayles goggles found course some distance crash occurred no way goggles Bayles always wore could have left enclosed cockpit unless canopy shattered ended short spectacular story fantastic aircraft air racing history Granville organization would go spectacular air racing achieve ments beautiful ghost City Springfield would some day return city name bore another celebration Bill Turner brought recreation Model Z 50th Anniversary Gee Bee Celebration few years ago another story continued Radio TechniquslMyor Continued page 43 Pylon Racing situation pilots start dueling antennas put test antenna about foot filers transmitter antenna crossing middle perpendicular rotate test antenna until parallel fliers transmitter antenna plane still flying sweep test -flight 20 kHz adjacent-channel inter ference simulate 1991 flying us ing now Kraft SRF trans mitter modules test transmitter antenna moved around duplicate 10 kHz adja cent-channel test -flight 40kHz adjacent-channel inter ference simulate 1983-87 flying using either transmitters old fre quencies new RC channels aircraft test-transmitter antenna moved around duplicate 10 kHz adja cent-channel test Third-order intermodulation inter ference ground test simulate situation three pilots standing too close together plane taxiing under some elses transmitter antenna Using transmitters three new RC channels sequence eg RC5O RC52 RC54 will air planes control transmitter well have three operators stand line 30 feet airplane transmitter antennas held parallel airplanes receiver antenna systems will ON two test transmitter operators will walk slowly toward airplane keeping transmitter antennas parallel Phase-glitch ground test neighboring transmitters turned OFF turn test system ON extend its antenna holding transmitter antenna parallel ground walk around airplane pivoting around tip transmitter antenna held more-or-less fixed space three feet above airplane watch servo jitters In-flight range test airplane maximum altitude distance conditions us collapses control transmitter antenna until either plane shows loss control antenna completely collapsed guy doing antenna work has keep out pilots line sight prepared times yank antenna out hurry pulling apart In-flight weak signal adjacent-channel interference tests repeat adjacent-channel tests above add In-flight Range test Its lot work Power output tests qualitative test just sure power outputs more-or-less equal use RS clip-on Field Strength Meter have Continued page 148 September 1984 145 Hosted Indian City Radio Control Club antenna around pilots body likebefore will record tne distance airport frisk operationwhich servos airplane start jitter test data shown times before Its out pro duction everyone should have some kind field strength meter Capture Ratio FM test peculiarity FM receiver stays tuned its control trans mitter signal until another similar trans mitter exactly same radio frequen cy presents stronger signal time control transfers interfering transmitter control transmitter set up 30 feet airplane receiver ground system turned ON interfer er must similar FM transmit ter sent further away turned ON test operator walks interferer until receiver captured relative distances between plane transmitters noted Monitoring Using John Lange con verter has described column several times check envi ronment see what flying usually sweep way across band before testing starts again after finished have some unex plained funnies Discussion jest results OK now have idea Kraft Synthesized SRF Switchable Radio Frequency sys tems tested want know results nutshell Kraft ready 1984 right now ready 1991 gets theyre also ready year between SRF systems passed tests No problems found used required AMA Phase-In Plan SRF 10-sanctionedRC-channel system because cant ac cess old frequencies 7208-7296 7564 MHz accesses new sanc tioned RC channels RCl2 RC38 RC42 RC44 RC46 RC48 RC5O RC52 RC54 RC56 technical reasons can use RC4O Ten channels adequate situations think have will become 22-sanctioned-RC-channel system December 20 1987 requiring anything make changes SRF modules date use old RC frequencies will cease AMA will activate RCl4 RCl6 RCl8 RC20 RC22 RC24 RC26 RC28 RC3O RC32 RC34 RC36 places aircraft December 20 1990 Kraft SRF will become 49-sanctioned-RC-channel system again requiring take action used SRF system channel adjacent existing old fre quency eg using 72250 MHz old Red/White 72240 MHz found SRF precise Kraft sets within 100 Hz marked frequen cy narrow-banded SRF system wont interfere suffer terference old system consider legal crystal toler ance old system can put 1800 Hz off its nominal frequency remember channel spacing talking about 10000 Hz result pretty clear ly shows SRF isnt threat some people took curiosity illustrating precision Kraft SRF system has noted several people Kraft SRF transmitter part FM system uses same KPR-8FD re ceiver reported last year often will fly crystal-controlled KPR-8FD receiver same channel RC52 case reason given specially-chosen matched pairs crystals Kraft used last year best available time werent precise enough match precisiontuning narrow-band SRF transmit ters What does tell about potential making interference synthesized transmitter Meanwhile should bear mind AMA Phase-In Plan considers other forms mutual interference well tested SRF systems did produce some ticipated interferences although very reduced level AMA-sanctioned MERICAN JUNIOR AJI Balsa Model Airplanes Whip-power U-Control Flrebaby II 020-049 Jr Fireball 049-090 OMING SOON -404 Interceptor Folding Wing Glider See favorite hobby dealer Write American Jr Heritage Models Inc PO Box 505 Donald Oregon 97020 channels chosen avoid prob lems AMA Phase-In Plan will followed through 1990 scheduled reason Conclusions tests tell us want Kraft SRF system planes Image-frequency problems RC band disappear can forget about traveling distant site find radio have plane cant used because local interference No standing end long line other RC channels empty waiting used No watching everybody fly off thermals cant reach because frequency being used No 2-plane heats just fill out rac ing schedule Pylon Quickee love George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Building BoardlHaught Continued page 45 finished door quick construction Being screwed together rather nailed makes easy disassemble few minutes stash away closet spare room needs used guests items incorporated meet requirements So far am quite pleased results Construction drawing shows materials required build table 36 wide 60 long prac tical size models size can easily altered fit building program selecting wood keep mind finished product want sharp looking table buy cedar 2 x 4s give varnish finish looking practical model choose good pine stock table built out structural 2 x 4s very inexpensive still good solid table top important part Choose care Doors can found finished unfinished solid hollow core solid doors best also expensive hard 148 Model Aviation Radio TechniquelMyor Continued page 145