George Myers BZZZZZ-OQPSI Th s month II tell about neat new device has several uses help find hiding RC model THIS will column about solving problems Im going assume have problem electronic circuit want try fix yourself willing accept risk failure will describe way proceed will use object lesson MPS System Alert received evaluation Edward Zindle Model Protective Systems 279 Jefferson Ave Buffalo NY 14204 device inserts between receiver servo purpose signalling battery voltage low beeping COLOR BAJiO SYStEMRESISTOR CODES IRESISTANCE GIVEN IN OHMSI -____ 116 MultiplierBliowN101 TolerancetiEr2100 21 yELLOW 41040GMV ORANGi3100031 Glilli NS1000451 RirM I... ilL E6100004061 VIULEI710000000iZ 26 GIIAY6 01 II ITMA AIIrnaiei301 Resistort Blk Body Color AreHiTE i Aii~tsiOl liE TMA AItenA Coitpositior Non-Insulatedcorp JAN d I1ETMA Prefrrrcdi5 iJAN .d RETMA irei Resistors Colored Bodies Are51L 116 rd RETMA 1rf-rd104 JAN a,d liP TNiA 1r Corrpositon InsulatedNOCoL201 Wre-Wound Rouslors Have IsOM V. .d r 0 100% t Color sand Double Widtn 3 6 i21-2 .d34 r AlA 4 20 0 .d sIpl,a, DISC CERAM CS IS- DOT SYSTEMI Sgnifrcant gu e Temperature Coellicient DISC CERAMICS 13-DOT SYSTEMI - isIP~nificanl CERAMIC CAPACITOR COOLS iCAPACITY GIViN INMMFI 1701 066 piIMl 1 ri-mi RANCPtiMpi-iFATi HiExTi-7NUiD HANG iili-HlOSiMi-0V1CI4011 iiliK% 1TlIiiiCOP Ii r LESSIOMiI c51011P11 1 Ii IlCANTPLIFH FIG 11617 -- - 1 AC0 211MM 201OiNPOi41iliFOANI001MM1133lNl3310 laO211102170NO7Si10-171 JIlANGi boO251ISFNNiSlli15j1*S Yi- l10 410110I -223N221l22- 1110111 (lIEN0SMMP 5133NIllI331 illIi--470iN47047111 VIpiET77S0lN7S75 iv ORAYit11tJSMMT311i03uii1l11 AilIriit11OMMI 101G,rai 511 51716jIlypa. & 010ICO.P11n1 i0011l00 1Ii. Disk capacitors numbers can difficult decode I. inch diameter smaller capacity may measured picofarads 10 may mean 10 picofarads 100Z lOOK may mean 100 picofarads Larger capacitors usually measured micro farads 001 usually means 001 microfarads does 104 means 1x104 picofarads microfarad million picofarads 50 10000 picofarads 001 microfarads didnt invent system just struggle Myers Handy Helperfor decoding markings electronic components likely find printed-circuit PC boards transmitter turned off contin uous buzz Im told very helpful finding model has decided hide under bush among tall corn stalks first move install System Alert sons sailplane Tim will fly hours time using Aquila high- start Cannon micro transmitter Got keep field kit light using bicycle trans portation Imagine surprise buz zer sounded four times out ten transmitter turned off didnt make sense Ed Zindle would send defective unit some other reason problem two choices could fix myself could send back order keep up image decided see what could Besides like solving puzzles Step figure out what unit supposed written instructions able prepare functional diagram reproduction among months illus trations Looking the-circuit board could determine functional elements two NE555 timer ICs two transistors some resistors capacitors Which does what became next question order answer question has know stuff connected took out - handful colored Flair El Markos proceeded color trail back PC board according what connected Black minus volts red positive volts easy since follow color code wires connected System Alert RC system caution Look very carefully wire jumpers continue circuit Ed hidden under IC expected colors use rest trails up end will find PC board pads just single points 22 Model Aviation IZZC BL [MAND Zig functional diagram MPS System Alert device much information body column interconnection final wiring diagram anyway can use same color once long keep pads separated mind Next youll want wiring diagram simple matter drawing ICs transistors big piece paper interconnecting symbols resistors capac itors values resistors capacitors indicated numbers colored stripes paint may run bit trouble since various manufacturers will mark same item differently rye included figure showing common markings should adequate have two choices can either drop project point can guess answer mark diagram question-mark next second later analysis supports guess save some time analysis doesnt give answer question mark warns really dont know what Im talking about can go some additional research have built several Ace RC Heath kits youll notice instruction manuals can very helpful decoding parts markings since always include general section subject book rack local Radio Shack store also contains handy references such Modern Dictionary Electronics Rudold E Graf Sams publication order find out whats inside ICs Integrated Circuits will need something like Semiconductor Reference Handbook Semiconductor Replacement Guide both available Radio Shack will find pin identifications descriptions functions performed behind pins few typical circuit applications completely de scribed clues may need understand whats happening additional books will bring absolute beginner level up advanced amateur Without going through whole learning process lets just say found everything System Alert logical working should meant Cannon receiver doing something unexpected Looking receiver servo plug expect see decoder passing out positive-going pulses often spend ing its time Off zero volts state Ive included sketch situation elsewhere What decoder stayed high positive volts sometimes transmitter turned off System Alerts pulse detec tor capacitor charged battery voltage discharged transistor acted upon positive-going pulses servo-control pulses stop capacitor goes high turning buzzer decoder receiver could stop high transistor would locked capacitor would locked low preventing buzzer sounding Continued page 109 November 198023 Heres what RC control pulses look like oscilloscope upper train typical 4-channel system Servo #2 sees bottom pattern interconnection diagram part MPS System Alert device obtained firsttracing circuit paths PC board colored markerpens have indicatedthe Myers Mod adapts device shift-register decoders info article BEGINNER TO PRO ES HOT STUFF JUST RIGHT FOR YOU HOT STUFF ORIGINAL CLEAR FORMULA LOW VISCOSITY-DEEP PENETRATION INSTANT BOND RATE 3 10 sec THIS IS THE ONE THAT STARTED IT ALL 2 oz HOT STUFF XXc LINEE EXCLUSIVE VISIBLE FORMULA LOW VISCOSITY-DEEP PENETRATION INSTANT BOND RATE 3 10 sec 1/2 OZ jV HOT STUFF GAP FILLING HIGH VISCOSITY-TIMED BOND 10 25 sec Use like regular glue wait 2 oz HOT STUFFGETS YOU OUT OF THE BUILDING ROOM AND INTO THE ACTION FAST HI-PERFORMANCE ADHESIVES FOR MODELERS AROUND THE WORLD %ad9t Ca P 0 BOX 836 SIMI CA 93062 522-0062 tenance Instructions TG-3A Glider Schweizer Aircraft Corporation Drawings National Archives Photos Documentary Photography black white 1361 ST Photo Sqd 1221 South Fern St Arlington VA 22202 Omcial USAF photos sale write price list ordering instructions 21298AC Front View XTG-3 21294ACTow Plane XTG-3 Background 21157AC Side View XTG-3 21296ACXTG-3 Takeoff Bungee Cor4 June 1979 Paint TG hy Bob Storck Color Aircraft Yellow Blue Color Insignia White Red Blue Black F0R MRGUSI ent meantime have System Alert refuses buzz turn transmitter off give fix try System FS NODupont NoAlert works time works properly ith systems mod forget 15123 98013about 17875Not critical 111361865H48 15044 17038Not critical Radio Technique/Myers Continued page 23 quick check oscilloscope showed exactly what happening wouldnt need oscilloscope see 6 volt DC meter lOOK resistance would work well Just connect between negative lead black wire signal lead orange wire turn receiver turn transmitter off few times Sometimes voltmeter will read positive volts some times zero transmitter off point may thinking its simple didnt start measure ment cut out other stuff Two reasons 1 didnt think time 2 needed System Alert wiring diagram wanted make worthwhile changes Knowing problem solution ob vious added 001 mfd capacitor series System Alert green wire Vs watt 1 megohm resistor base input transistor ground Ive supplied sketch too capacitor passes pulses blocks DC resistor insures input transistor turns off So buzzer must sound optimum values just values worked Ed says will make change production may turn out differAnother fix some people may want know about following frame-time resistor early Ace RC Silver Seven trans mitter encoders 270K R2 just above NE5044 has changed production 330 K reason change increase frame time l8ms adequate 2 3 4 5-channel receivers 22ms necessary 6- 7-channel re ceivers Paul Edmunds Pauls Re Omaha NE discovered need change fix worked out Paul Holsten Ace RC Mr Edmunds good enough write tell about Tom Runge president Ace good enough write tell change has made production have early models either swap 33OKforthe27OKordowhatldidIputaS6K resistor series 270K provisions shorting out again should need arise As happens sons 4-channel Cannon system uses 16 millisecond frame transmitter receiver servos want fly flight packs Ill need 18 ms option Mismatched frame times can lead poor servo performance Its much easier retime transmitter go inside receiver servo re-time match transmitter beauty S7 its easy make whatever change need Frame time wondering what Im talking about time required complete set control pulses plus required reset pulse Theres sketch illus trating elsewhere column Since control pulse per channel U BOX 3957TORRANCE CA 90510 frame time also period required repe titions control pulse individual servo servo designed stretch its control pulse over full frame time transmitter designed work fore given servo may work poorly another manufacturers transmitter since new transmitter will have time either longer causing servo somewhat sloppy about staying its rest position shorter causing servo act jittery Figur ing out what frame time servo wants can subject another whole column now play mix-and-match various servos suspect frame-time problems dont ploy well together Nats takes over December issue no Radio Technique until next year See George M Myers 70 Froehlich Farm Road Hicks vOle NY 11801 Scale WC/Wischers Continued page 28 Thats international cooperation its finest third Canadian team member Karel Solnicka also radio problems round two flight fortunate Piper Twin Comanche splattered itself vertically onto runway completely destroyed static scoring F4C Precision Scale completed models flown third flying day gusty turbulent windswith threat rain contrasted lack wind enjoyed Standoff fliers previous two days Strong crosswinds encountered times three days F4C flights Seven 20 entries made no flights damaged during takeoff Highest flight score day made Frank Knowles Tiger Moth November 1980 109 9 HL GLIDERS flfl 3 SATELLITE KITS EEE 17OLDTIMEGAS Send 25 5 RUBBER 3 NORDIC 1980 catalog 9 COMPETIT ION GAS FUEL DTTIMERS -$1075 FAI Model Supply
Edition: Model Aviation - 1980/11
Page Numbers: 22, 23, 109
George Myers BZZZZZ-OQPSI Th s month II tell about neat new device has several uses help find hiding RC model THIS will column about solving problems Im going assume have problem electronic circuit want try fix yourself willing accept risk failure will describe way proceed will use object lesson MPS System Alert received evaluation Edward Zindle Model Protective Systems 279 Jefferson Ave Buffalo NY 14204 device inserts between receiver servo purpose signalling battery voltage low beeping COLOR BAJiO SYStEMRESISTOR CODES IRESISTANCE GIVEN IN OHMSI -____ 116 MultiplierBliowN101 TolerancetiEr2100 21 yELLOW 41040GMV ORANGi3100031 Glilli NS1000451 RirM I... ilL E6100004061 VIULEI710000000iZ 26 GIIAY6 01 II ITMA AIIrnaiei301 Resistort Blk Body Color AreHiTE i Aii~tsiOl liE TMA AItenA Coitpositior Non-Insulatedcorp JAN d I1ETMA Prefrrrcdi5 iJAN .d RETMA irei Resistors Colored Bodies Are51L 116 rd RETMA 1rf-rd104 JAN a,d liP TNiA 1r Corrpositon InsulatedNOCoL201 Wre-Wound Rouslors Have IsOM V. .d r 0 100% t Color sand Double Widtn 3 6 i21-2 .d34 r AlA 4 20 0 .d sIpl,a, DISC CERAM CS IS- DOT SYSTEMI Sgnifrcant gu e Temperature Coellicient DISC CERAMICS 13-DOT SYSTEMI - isIP~nificanl CERAMIC CAPACITOR COOLS iCAPACITY GIViN INMMFI 1701 066 piIMl 1 ri-mi RANCPtiMpi-iFATi HiExTi-7NUiD HANG iili-HlOSiMi-0V1CI4011 iiliK% 1TlIiiiCOP Ii r LESSIOMiI c51011P11 1 Ii IlCANTPLIFH FIG 11617 -- - 1 AC0 211MM 201OiNPOi41iliFOANI001MM1133lNl3310 laO211102170NO7Si10-171 JIlANGi boO251ISFNNiSlli15j1*S Yi- l10 410110I -223N221l22- 1110111 (lIEN0SMMP 5133NIllI331 illIi--470iN47047111 VIpiET77S0lN7S75 iv ORAYit11tJSMMT311i03uii1l11 AilIriit11OMMI 101G,rai 511 51716jIlypa. & 010ICO.P11n1 i0011l00 1Ii. Disk capacitors numbers can difficult decode I. inch diameter smaller capacity may measured picofarads 10 may mean 10 picofarads 100Z lOOK may mean 100 picofarads Larger capacitors usually measured micro farads 001 usually means 001 microfarads does 104 means 1x104 picofarads microfarad million picofarads 50 10000 picofarads 001 microfarads didnt invent system just struggle Myers Handy Helperfor decoding markings electronic components likely find printed-circuit PC boards transmitter turned off contin uous buzz Im told very helpful finding model has decided hide under bush among tall corn stalks first move install System Alert sons sailplane Tim will fly hours time using Aquila high- start Cannon micro transmitter Got keep field kit light using bicycle trans portation Imagine surprise buz zer sounded four times out ten transmitter turned off didnt make sense Ed Zindle would send defective unit some other reason problem two choices could fix myself could send back order keep up image decided see what could Besides like solving puzzles Step figure out what unit supposed written instructions able prepare functional diagram reproduction among months illus trations Looking the-circuit board could determine functional elements two NE555 timer ICs two transistors some resistors capacitors Which does what became next question order answer question has know stuff connected took out - handful colored Flair El Markos proceeded color trail back PC board according what connected Black minus volts red positive volts easy since follow color code wires connected System Alert RC system caution Look very carefully wire jumpers continue circuit Ed hidden under IC expected colors use rest trails up end will find PC board pads just single points 22 Model Aviation IZZC BL [MAND Zig functional diagram MPS System Alert device much information body column interconnection final wiring diagram anyway can use same color once long keep pads separated mind Next youll want wiring diagram simple matter drawing ICs transistors big piece paper interconnecting symbols resistors capac itors values resistors capacitors indicated numbers colored stripes paint may run bit trouble since various manufacturers will mark same item differently rye included figure showing common markings should adequate have two choices can either drop project point can guess answer mark diagram question-mark next second later analysis supports guess save some time analysis doesnt give answer question mark warns really dont know what Im talking about can go some additional research have built several Ace RC Heath kits youll notice instruction manuals can very helpful decoding parts markings since always include general section subject book rack local Radio Shack store also contains handy references such Modern Dictionary Electronics Rudold E Graf Sams publication order find out whats inside ICs Integrated Circuits will need something like Semiconductor Reference Handbook Semiconductor Replacement Guide both available Radio Shack will find pin identifications descriptions functions performed behind pins few typical circuit applications completely de scribed clues may need understand whats happening additional books will bring absolute beginner level up advanced amateur Without going through whole learning process lets just say found everything System Alert logical working should meant Cannon receiver doing something unexpected Looking receiver servo plug expect see decoder passing out positive-going pulses often spend ing its time Off zero volts state Ive included sketch situation elsewhere What decoder stayed high positive volts sometimes transmitter turned off System Alerts pulse detec tor capacitor charged battery voltage discharged transistor acted upon positive-going pulses servo-control pulses stop capacitor goes high turning buzzer decoder receiver could stop high transistor would locked capacitor would locked low preventing buzzer sounding Continued page 109 November 198023 Heres what RC control pulses look like oscilloscope upper train typical 4-channel system Servo #2 sees bottom pattern interconnection diagram part MPS System Alert device obtained firsttracing circuit paths PC board colored markerpens have indicatedthe Myers Mod adapts device shift-register decoders info article BEGINNER TO PRO ES HOT STUFF JUST RIGHT FOR YOU HOT STUFF ORIGINAL CLEAR FORMULA LOW VISCOSITY-DEEP PENETRATION INSTANT BOND RATE 3 10 sec THIS IS THE ONE THAT STARTED IT ALL 2 oz HOT STUFF XXc LINEE EXCLUSIVE VISIBLE FORMULA LOW VISCOSITY-DEEP PENETRATION INSTANT BOND RATE 3 10 sec 1/2 OZ jV HOT STUFF GAP FILLING HIGH VISCOSITY-TIMED BOND 10 25 sec Use like regular glue wait 2 oz HOT STUFFGETS YOU OUT OF THE BUILDING ROOM AND INTO THE ACTION FAST HI-PERFORMANCE ADHESIVES FOR MODELERS AROUND THE WORLD %ad9t Ca P 0 BOX 836 SIMI CA 93062 522-0062 tenance Instructions TG-3A Glider Schweizer Aircraft Corporation Drawings National Archives Photos Documentary Photography black white 1361 ST Photo Sqd 1221 South Fern St Arlington VA 22202 Omcial USAF photos sale write price list ordering instructions 21298AC Front View XTG-3 21294ACTow Plane XTG-3 Background 21157AC Side View XTG-3 21296ACXTG-3 Takeoff Bungee Cor4 June 1979 Paint TG hy Bob Storck Color Aircraft Yellow Blue Color Insignia White Red Blue Black F0R MRGUSI ent meantime have System Alert refuses buzz turn transmitter off give fix try System FS NODupont NoAlert works time works properly ith systems mod forget 15123 98013about 17875Not critical 111361865H48 15044 17038Not critical Radio Technique/Myers Continued page 23 quick check oscilloscope showed exactly what happening wouldnt need oscilloscope see 6 volt DC meter lOOK resistance would work well Just connect between negative lead black wire signal lead orange wire turn receiver turn transmitter off few times Sometimes voltmeter will read positive volts some times zero transmitter off point may thinking its simple didnt start measure ment cut out other stuff Two reasons 1 didnt think time 2 needed System Alert wiring diagram wanted make worthwhile changes Knowing problem solution ob vious added 001 mfd capacitor series System Alert green wire Vs watt 1 megohm resistor base input transistor ground Ive supplied sketch too capacitor passes pulses blocks DC resistor insures input transistor turns off So buzzer must sound optimum values just values worked Ed says will make change production may turn out differAnother fix some people may want know about following frame-time resistor early Ace RC Silver Seven trans mitter encoders 270K R2 just above NE5044 has changed production 330 K reason change increase frame time l8ms adequate 2 3 4 5-channel receivers 22ms necessary 6- 7-channel re ceivers Paul Edmunds Pauls Re Omaha NE discovered need change fix worked out Paul Holsten Ace RC Mr Edmunds good enough write tell about Tom Runge president Ace good enough write tell change has made production have early models either swap 33OKforthe27OKordowhatldidIputaS6K resistor series 270K provisions shorting out again should need arise As happens sons 4-channel Cannon system uses 16 millisecond frame transmitter receiver servos want fly flight packs Ill need 18 ms option Mismatched frame times can lead poor servo performance Its much easier retime transmitter go inside receiver servo re-time match transmitter beauty S7 its easy make whatever change need Frame time wondering what Im talking about time required complete set control pulses plus required reset pulse Theres sketch illus trating elsewhere column Since control pulse per channel U BOX 3957TORRANCE CA 90510 frame time also period required repe titions control pulse individual servo servo designed stretch its control pulse over full frame time transmitter designed work fore given servo may work poorly another manufacturers transmitter since new transmitter will have time either longer causing servo somewhat sloppy about staying its rest position shorter causing servo act jittery Figur ing out what frame time servo wants can subject another whole column now play mix-and-match various servos suspect frame-time problems dont ploy well together Nats takes over December issue no Radio Technique until next year See George M Myers 70 Froehlich Farm Road Hicks vOle NY 11801 Scale WC/Wischers Continued page 28 Thats international cooperation its finest third Canadian team member Karel Solnicka also radio problems round two flight fortunate Piper Twin Comanche splattered itself vertically onto runway completely destroyed static scoring F4C Precision Scale completed models flown third flying day gusty turbulent windswith threat rain contrasted lack wind enjoyed Standoff fliers previous two days Strong crosswinds encountered times three days F4C flights Seven 20 entries made no flights damaged during takeoff Highest flight score day made Frank Knowles Tiger Moth November 1980 109 9 HL GLIDERS flfl 3 SATELLITE KITS EEE 17OLDTIMEGAS Send 25 5 RUBBER 3 NORDIC 1980 catalog 9 COMPETIT ION GAS FUEL DTTIMERS -$1075 FAI Model Supply
Edition: Model Aviation - 1980/11
Page Numbers: 22, 23, 109
George Myers BZZZZZ-OQPSI Th s month II tell about neat new device has several uses help find hiding RC model THIS will column about solving problems Im going assume have problem electronic circuit want try fix yourself willing accept risk failure will describe way proceed will use object lesson MPS System Alert received evaluation Edward Zindle Model Protective Systems 279 Jefferson Ave Buffalo NY 14204 device inserts between receiver servo purpose signalling battery voltage low beeping COLOR BAJiO SYStEMRESISTOR CODES IRESISTANCE GIVEN IN OHMSI -____ 116 MultiplierBliowN101 TolerancetiEr2100 21 yELLOW 41040GMV ORANGi3100031 Glilli NS1000451 RirM I... ilL E6100004061 VIULEI710000000iZ 26 GIIAY6 01 II ITMA AIIrnaiei301 Resistort Blk Body Color AreHiTE i Aii~tsiOl liE TMA AItenA Coitpositior Non-Insulatedcorp JAN d I1ETMA Prefrrrcdi5 iJAN .d RETMA irei Resistors Colored Bodies Are51L 116 rd RETMA 1rf-rd104 JAN a,d liP TNiA 1r Corrpositon InsulatedNOCoL201 Wre-Wound Rouslors Have IsOM V. .d r 0 100% t Color sand Double Widtn 3 6 i21-2 .d34 r AlA 4 20 0 .d sIpl,a, DISC CERAM CS IS- DOT SYSTEMI Sgnifrcant gu e Temperature Coellicient DISC CERAMICS 13-DOT SYSTEMI - isIP~nificanl CERAMIC CAPACITOR COOLS iCAPACITY GIViN INMMFI 1701 066 piIMl 1 ri-mi RANCPtiMpi-iFATi HiExTi-7NUiD HANG iili-HlOSiMi-0V1CI4011 iiliK% 1TlIiiiCOP Ii r LESSIOMiI c51011P11 1 Ii IlCANTPLIFH FIG 11617 -- - 1 AC0 211MM 201OiNPOi41iliFOANI001MM1133lNl3310 laO211102170NO7Si10-171 JIlANGi boO251ISFNNiSlli15j1*S Yi- l10 410110I -223N221l22- 1110111 (lIEN0SMMP 5133NIllI331 illIi--470iN47047111 VIpiET77S0lN7S75 iv ORAYit11tJSMMT311i03uii1l11 AilIriit11OMMI 101G,rai 511 51716jIlypa. & 010ICO.P11n1 i0011l00 1Ii. Disk capacitors numbers can difficult decode I. inch diameter smaller capacity may measured picofarads 10 may mean 10 picofarads 100Z lOOK may mean 100 picofarads Larger capacitors usually measured micro farads 001 usually means 001 microfarads does 104 means 1x104 picofarads microfarad million picofarads 50 10000 picofarads 001 microfarads didnt invent system just struggle Myers Handy Helperfor decoding markings electronic components likely find printed-circuit PC boards transmitter turned off contin uous buzz Im told very helpful finding model has decided hide under bush among tall corn stalks first move install System Alert sons sailplane Tim will fly hours time using Aquila high- start Cannon micro transmitter Got keep field kit light using bicycle trans portation Imagine surprise buz zer sounded four times out ten transmitter turned off didnt make sense Ed Zindle would send defective unit some other reason problem two choices could fix myself could send back order keep up image decided see what could Besides like solving puzzles Step figure out what unit supposed written instructions able prepare functional diagram reproduction among months illus trations Looking the-circuit board could determine functional elements two NE555 timer ICs two transistors some resistors capacitors Which does what became next question order answer question has know stuff connected took out - handful colored Flair El Markos proceeded color trail back PC board according what connected Black minus volts red positive volts easy since follow color code wires connected System Alert RC system caution Look very carefully wire jumpers continue circuit Ed hidden under IC expected colors use rest trails up end will find PC board pads just single points 22 Model Aviation IZZC BL [MAND Zig functional diagram MPS System Alert device much information body column interconnection final wiring diagram anyway can use same color once long keep pads separated mind Next youll want wiring diagram simple matter drawing ICs transistors big piece paper interconnecting symbols resistors capac itors values resistors capacitors indicated numbers colored stripes paint may run bit trouble since various manufacturers will mark same item differently rye included figure showing common markings should adequate have two choices can either drop project point can guess answer mark diagram question-mark next second later analysis supports guess save some time analysis doesnt give answer question mark warns really dont know what Im talking about can go some additional research have built several Ace RC Heath kits youll notice instruction manuals can very helpful decoding parts markings since always include general section subject book rack local Radio Shack store also contains handy references such Modern Dictionary Electronics Rudold E Graf Sams publication order find out whats inside ICs Integrated Circuits will need something like Semiconductor Reference Handbook Semiconductor Replacement Guide both available Radio Shack will find pin identifications descriptions functions performed behind pins few typical circuit applications completely de scribed clues may need understand whats happening additional books will bring absolute beginner level up advanced amateur Without going through whole learning process lets just say found everything System Alert logical working should meant Cannon receiver doing something unexpected Looking receiver servo plug expect see decoder passing out positive-going pulses often spend ing its time Off zero volts state Ive included sketch situation elsewhere What decoder stayed high positive volts sometimes transmitter turned off System Alerts pulse detec tor capacitor charged battery voltage discharged transistor acted upon positive-going pulses servo-control pulses stop capacitor goes high turning buzzer decoder receiver could stop high transistor would locked capacitor would locked low preventing buzzer sounding Continued page 109 November 198023 Heres what RC control pulses look like oscilloscope upper train typical 4-channel system Servo #2 sees bottom pattern interconnection diagram part MPS System Alert device obtained firsttracing circuit paths PC board colored markerpens have indicatedthe Myers Mod adapts device shift-register decoders info article BEGINNER TO PRO ES HOT STUFF JUST RIGHT FOR YOU HOT STUFF ORIGINAL CLEAR FORMULA LOW VISCOSITY-DEEP PENETRATION INSTANT BOND RATE 3 10 sec THIS IS THE ONE THAT STARTED IT ALL 2 oz HOT STUFF XXc LINEE EXCLUSIVE VISIBLE FORMULA LOW VISCOSITY-DEEP PENETRATION INSTANT BOND RATE 3 10 sec 1/2 OZ jV HOT STUFF GAP FILLING HIGH VISCOSITY-TIMED BOND 10 25 sec Use like regular glue wait 2 oz HOT STUFFGETS YOU OUT OF THE BUILDING ROOM AND INTO THE ACTION FAST HI-PERFORMANCE ADHESIVES FOR MODELERS AROUND THE WORLD %ad9t Ca P 0 BOX 836 SIMI CA 93062 522-0062 tenance Instructions TG-3A Glider Schweizer Aircraft Corporation Drawings National Archives Photos Documentary Photography black white 1361 ST Photo Sqd 1221 South Fern St Arlington VA 22202 Omcial USAF photos sale write price list ordering instructions 21298AC Front View XTG-3 21294ACTow Plane XTG-3 Background 21157AC Side View XTG-3 21296ACXTG-3 Takeoff Bungee Cor4 June 1979 Paint TG hy Bob Storck Color Aircraft Yellow Blue Color Insignia White Red Blue Black F0R MRGUSI ent meantime have System Alert refuses buzz turn transmitter off give fix try System FS NODupont NoAlert works time works properly ith systems mod forget 15123 98013about 17875Not critical 111361865H48 15044 17038Not critical Radio Technique/Myers Continued page 23 quick check oscilloscope showed exactly what happening wouldnt need oscilloscope see 6 volt DC meter lOOK resistance would work well Just connect between negative lead black wire signal lead orange wire turn receiver turn transmitter off few times Sometimes voltmeter will read positive volts some times zero transmitter off point may thinking its simple didnt start measure ment cut out other stuff Two reasons 1 didnt think time 2 needed System Alert wiring diagram wanted make worthwhile changes Knowing problem solution ob vious added 001 mfd capacitor series System Alert green wire Vs watt 1 megohm resistor base input transistor ground Ive supplied sketch too capacitor passes pulses blocks DC resistor insures input transistor turns off So buzzer must sound optimum values just values worked Ed says will make change production may turn out differAnother fix some people may want know about following frame-time resistor early Ace RC Silver Seven trans mitter encoders 270K R2 just above NE5044 has changed production 330 K reason change increase frame time l8ms adequate 2 3 4 5-channel receivers 22ms necessary 6- 7-channel re ceivers Paul Edmunds Pauls Re Omaha NE discovered need change fix worked out Paul Holsten Ace RC Mr Edmunds good enough write tell about Tom Runge president Ace good enough write tell change has made production have early models either swap 33OKforthe27OKordowhatldidIputaS6K resistor series 270K provisions shorting out again should need arise As happens sons 4-channel Cannon system uses 16 millisecond frame transmitter receiver servos want fly flight packs Ill need 18 ms option Mismatched frame times can lead poor servo performance Its much easier retime transmitter go inside receiver servo re-time match transmitter beauty S7 its easy make whatever change need Frame time wondering what Im talking about time required complete set control pulses plus required reset pulse Theres sketch illus trating elsewhere column Since control pulse per channel U BOX 3957TORRANCE CA 90510 frame time also period required repe titions control pulse individual servo servo designed stretch its control pulse over full frame time transmitter designed work fore given servo may work poorly another manufacturers transmitter since new transmitter will have time either longer causing servo somewhat sloppy about staying its rest position shorter causing servo act jittery Figur ing out what frame time servo wants can subject another whole column now play mix-and-match various servos suspect frame-time problems dont ploy well together Nats takes over December issue no Radio Technique until next year See George M Myers 70 Froehlich Farm Road Hicks vOle NY 11801 Scale WC/Wischers Continued page 28 Thats international cooperation its finest third Canadian team member Karel Solnicka also radio problems round two flight fortunate Piper Twin Comanche splattered itself vertically onto runway completely destroyed static scoring F4C Precision Scale completed models flown third flying day gusty turbulent windswith threat rain contrasted lack wind enjoyed Standoff fliers previous two days Strong crosswinds encountered times three days F4C flights Seven 20 entries made no flights damaged during takeoff Highest flight score day made Frank Knowles Tiger Moth November 1980 109 9 HL GLIDERS flfl 3 SATELLITE KITS EEE 17OLDTIMEGAS Send 25 5 RUBBER 3 NORDIC 1980 catalog 9 COMPETIT ION GAS FUEL DTTIMERS -$1075 FAI Model Supply