LAST MONTH discussed lot techniques have used past well present try rid air craft phenomenon known glitch es now us have heard hor ror stories about glitches caused long servo leads especially ailerons no real tangible explanation has come alonguntil now turns out best way attack problem could call problem simply imple ment correct cure before bother trying fly airplane especially true cable runs ser vos excess 48 Theres just no point taking chances see will work such simple effective alternative like Glitch Buster Glitch Buster installed aircraft youll have several factors actual ly working advantage First can use small battery pack switch harness came radio power receiver itself means receiver will get nice clean trash-free DC voltage power also means receiver will operate reliably several hours single charge least radio link ground will assured entire time air Next have ad vantage optical coupling between receiver s decoder outputs servos take look schematic Glitch Buster will see three wires coming channel SCHEMATIC channel RaRc I0Oohms33K 4N31IN Reciever J RbCa 47K001 Signal Gnd receiver connect input side opto-coupler through two resistors transistor transistor booster decoder output drives light-emitting diode inside 4N3 1 package beam infrared light carries signal across small gap clear insulating material photo-tran sistor across course diode transistor sealed inside little Servo Cal V 001 4049 OUT Signal 8 Servo Gnd CHANNEL II 1213141516 PIN IN PIN OUT II 51719111 14 12 1416110112 15 Left Heres PC board ready go etch own sure check tiny shorts opens traces An early check may save much time later Right First step soider resistors capacitors easiest part photos author Left Next put transistors integrated circuit careful handling 4049 IC sensitive static charges until soldered board Finally solder together wires come receiver go servos use Deans connectors might want use block connector servo side save wiring bulk Right soldering has completed clean off flux acetone lacquer thinner PC bottom should show bright shiny solder joints 40 Model Aviation youve built few electronics kits will have know-how construct de vice has cured big-airplane glitch problem author long leads heavy-duty servos Part 2EJoe Utasi six-pin package keep light outside world upsetting things photo-transistor picks up light signal converts back elec trical waveform Pin 5 4N3 1 pack age Since neither signal nor power leads connected receiver noise current spikes possible RF interference servo wiring ex posed can penetrate upset receiver circuitry Since waveform point upside down signals optocoupler routed 4049 inverter buffer does two things gets signal turned around correctly boosts high servo battery pack will allow Since receivers put out servo pulse between three four volts because internal voltage regula tors extra volt represents about 20% increase signal amplitude reaching servo especially im portant flying area prone lot RF interference paging systems power lines oth sources Lastly since system must use separate alrborne battery servo power servo motor current spikes motor noise stop short getting back receiver bottom line youve taken possible step pre vent potential glitches doing system shown helped Futa ba J series FM system tremendously 00 00w O4 oo ign Rb G n d gnal Rb Gn d Signal G n Ra V Buss Buss OO OO Gnd Rb Sign iv Component placement wiring connections PC board shown gray tint no other combination gadgets would work same irplane flew just fine JR radio borrowed system give back its owner Some systems tolerant noise long leads others its just worth taking chance can something about Glitch Buster will help cope better problems created long servo wiring dont forget backup battery pack can also help avoid crash believe single pack receiver adequate well cared March 1985 41 Bottom view PC board twotimes final size Another Giitch Buster finishedready abie put nasty giitches away good eR TOW HOOK RELEASE Price 5890 Afterof Simplest reliable device available line released hook retracts unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Vs oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG 4 VIBRATION FREE PRICE $300 PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 cushioned adequately air craft would still recommend backup pack servo side Glitch Buster transparent far rest airplane systems concerned power leads servo pack GB board can routed through battery backup system just normally would Assembly Glitch Buster very sim ple goes fast First solder resistors capacitors Next come transistors integrated circuits Just make sure get orientation marks notch dot end chip going proper direction Check parts drawing assembly photo graphs sure last thing to solder pigtails get plugged receiver leads go ing servos leads going servos should have power ground wires capable handling high currents minimum voltage drop new Ace RC heavyduty wire perfect As matter fact prewired Ace RC heavy-duty switch harness can used servo side system absolutely no changes After soldering finished clean off flux residue some acetone lacquer thinner inspect finished board cold solder joints pins may have missed looks OK place board plastic box plug together board size chosen specifically fit inside plastic case Ace RC uses Servo Pacer Silver Seven receiver dont believe size could have reduced further making project impossible build last point folks like know details capacitor goes Pin 6 4N3 1 ground necessary eliminate some jitter pulse width output opto-coupler caused random noise within device itself After testing about 50 4N3 1 devices found behaved exactly same soit must characteristic device itself capacitor place no measur able jitter pulsewidth surprised though checking jit ter found radio system about microsecond jitter during normal operation guess just expected perfect Needless say little disappointed about very pleased Glitch Buster didnt add little technical talk folks out might interested started playing opto couplers figured would about 10-minute job get everything just right Well seems cases just thought knew worked After few hours knew doing something wrong because Continued Page 125 42 Model Aviation 1/32 scale plastic model kits Golden Age classic aircraft Colorful highly detailed miniatures Send $1 fully illustrated cata log other kits accessories DEPT MA 181 PAWNEE ST SAN MARCOS CALIFORNIA 92069 Winning Ideas FOURMOST 40 AIRFLO ENGINE MOUNT IDEAL FOR OUICKY 505 U I I iabout time. Its about time started enjoying benefits Master Jig 400 RC Modeler Magazine wrote .. rugged well made modelers accessory tool Model Airplane News called years better mousetrap. eases pain paintings coverings installing. worth penny. Isnt about time ordered Master Jig 4007 Mail toI TIDE DISTRIBUTORS PO Box 317/MAN 0385 Minto ND 58261 Phone 701 248-3001 Days 701 352-2667 Evenings ElMaster Jig 400 $12995 Shipping/Handling El Free brochure EJ1/2VHSvideotapc-53000loll []1/2BETAvideolape-S3O00[~J S2000 refunded tape returned wthm 30 days EZVISA WMASTERCARD DCHECK NAME ADDRESSI STATEZIPI MASTER JIG 400 uP udne] Radio Technique/Myers Continued page 39 spot-welded together heavy-duty straps Theres blob solder await ing wires will attach pack Does work tests prototype started engines 60 cu under tried Admittedly battery terminal voltage about 10 VDC run ning 6 VDC stalled particular engine needs full 12 volts ie normally connect starter directly automobile battery can add four cells pack problem you lose simple recharging ability discussed above Sullivan cable can connected starter motor function usual way struggling balky motor doing something else makes want save built-on pack Extra adapters provided fast slow charging reversing motor direction instructions show make yourself either left-handed righthanded starter package whole thing adds 10 ounces starter becomes 3 lb 11 oz can deduct several pounds field kit Larrys Piggy Back Starter Pack can ordered SR Batteries Box 28729 Maple Ave Bellport NY 11713 phone 516 286-0079 George M Myers 70 Froehliclz Farm Rd Hicksville NY 11801 Glitch Buster/Utasi Continued page 42 critter just wouldnt what expected point figured would good time read instructions Sure enough spec sheet said certain amount current drive re quired expected get nice clean rise time both photo diode photo transistor bumped-up current drive diode caused slightly improved waveform opto output Now seemed output would oscillate during ON time signal wouldnt cause total failure added about 10 microsec onds jitter completely unacceptable Adjusting current level photo-transistor got things back line have clean fast edges NO jitter mention just case plan substituting some other opto coupler personally know just about same Pay attention spec sheets data labeled current transfer ratio rise time vs Ic Ic vs diode current Itll save lot bench time Part Number Ra Rb Rc Ca Opto IC-2 PC board Case Q Quan tity 6 6 6 7 6 6 Parts List Value 100 ohms 47K ohms 15K ohms 001 mono ceramic 4N31 Motorola CD4049 GB-i Ace Servo Pacer Silver Seven 2N3904 NPN transistor An assembled unit furnished receiver servo leads available Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 $4000 PC board alone $750 prefer have system fur nished completely wired match radio contact EMS 714-637-2161 check pricing Foam Its Best Deal Best March 1985 125 FOAM WING CORES CUSTOM FOAM CLJTTING Ole Reliable 1938 Old Timer Doc Mathews Custom uut i-uO 102 Fuse 78 OCEAN STATE AEROMODEL ENGINEERING $14995 21 Jaycee Drc Dealer & Kit West Worwick RI 02893Manufacturers VISA 401 8288813Inquiries Invited Coming Soon / Scale F8F Bearcat MONOCOUPE 90A QUARTER SCALE QUADRA4 CYCLE SEND $200 FOR COMPLETE CATALOG OF FINE KITS IKON NWST PO Box 566 Auburn WA 98071 206941-8248 19.35 Engine Econo-Kit $5495 Deluxe-Kit $6495 Shipping Machine cut spruce & balsa Illustrated instructions F un-Line ModelsNOTE KANSAS RESIDENTS PO Box 2392 Shawnee Mission Kansas 66201
Edition: Model Aviation - 1985/03
Page Numbers: 40, 41, 42, 125
Edition: Model Aviation - 1985/03
Page Numbers: 40, 41, 42, 125
LAST MONTH discussed lot techniques have used past well present try rid air craft phenomenon known glitch es now us have heard hor ror stories about glitches caused long servo leads especially ailerons no real tangible explanation has come alonguntil now turns out best way attack problem could call problem simply imple ment correct cure before bother trying fly airplane especially true cable runs ser vos excess 48 Theres just no point taking chances see will work such simple effective alternative like Glitch Buster Glitch Buster installed aircraft youll have several factors actual ly working advantage First can use small battery pack switch harness came radio power receiver itself means receiver will get nice clean trash-free DC voltage power also means receiver will operate reliably several hours single charge least radio link ground will assured entire time air Next have ad vantage optical coupling between receiver s decoder outputs servos take look schematic Glitch Buster will see three wires coming channel SCHEMATIC channel RaRc I0Oohms33K 4N31IN Reciever J RbCa 47K001 Signal Gnd receiver connect input side opto-coupler through two resistors transistor transistor booster decoder output drives light-emitting diode inside 4N3 1 package beam infrared light carries signal across small gap clear insulating material photo-tran sistor across course diode transistor sealed inside little Servo Cal V 001 4049 OUT Signal 8 Servo Gnd CHANNEL II 1213141516 PIN IN PIN OUT II 51719111 14 12 1416110112 15 Left Heres PC board ready go etch own sure check tiny shorts opens traces An early check may save much time later Right First step soider resistors capacitors easiest part photos author Left Next put transistors integrated circuit careful handling 4049 IC sensitive static charges until soldered board Finally solder together wires come receiver go servos use Deans connectors might want use block connector servo side save wiring bulk Right soldering has completed clean off flux acetone lacquer thinner PC bottom should show bright shiny solder joints 40 Model Aviation youve built few electronics kits will have know-how construct de vice has cured big-airplane glitch problem author long leads heavy-duty servos Part 2EJoe Utasi six-pin package keep light outside world upsetting things photo-transistor picks up light signal converts back elec trical waveform Pin 5 4N3 1 pack age Since neither signal nor power leads connected receiver noise current spikes possible RF interference servo wiring ex posed can penetrate upset receiver circuitry Since waveform point upside down signals optocoupler routed 4049 inverter buffer does two things gets signal turned around correctly boosts high servo battery pack will allow Since receivers put out servo pulse between three four volts because internal voltage regula tors extra volt represents about 20% increase signal amplitude reaching servo especially im portant flying area prone lot RF interference paging systems power lines oth sources Lastly since system must use separate alrborne battery servo power servo motor current spikes motor noise stop short getting back receiver bottom line youve taken possible step pre vent potential glitches doing system shown helped Futa ba J series FM system tremendously 00 00w O4 oo ign Rb G n d gnal Rb Gn d Signal G n Ra V Buss Buss OO OO Gnd Rb Sign iv Component placement wiring connections PC board shown gray tint no other combination gadgets would work same irplane flew just fine JR radio borrowed system give back its owner Some systems tolerant noise long leads others its just worth taking chance can something about Glitch Buster will help cope better problems created long servo wiring dont forget backup battery pack can also help avoid crash believe single pack receiver adequate well cared March 1985 41 Bottom view PC board twotimes final size Another Giitch Buster finishedready abie put nasty giitches away good eR TOW HOOK RELEASE Price 5890 Afterof Simplest reliable device available line released hook retracts unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Vs oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG 4 VIBRATION FREE PRICE $300 PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 cushioned adequately air craft would still recommend backup pack servo side Glitch Buster transparent far rest airplane systems concerned power leads servo pack GB board can routed through battery backup system just normally would Assembly Glitch Buster very sim ple goes fast First solder resistors capacitors Next come transistors integrated circuits Just make sure get orientation marks notch dot end chip going proper direction Check parts drawing assembly photo graphs sure last thing to solder pigtails get plugged receiver leads go ing servos leads going servos should have power ground wires capable handling high currents minimum voltage drop new Ace RC heavyduty wire perfect As matter fact prewired Ace RC heavy-duty switch harness can used servo side system absolutely no changes After soldering finished clean off flux residue some acetone lacquer thinner inspect finished board cold solder joints pins may have missed looks OK place board plastic box plug together board size chosen specifically fit inside plastic case Ace RC uses Servo Pacer Silver Seven receiver dont believe size could have reduced further making project impossible build last point folks like know details capacitor goes Pin 6 4N3 1 ground necessary eliminate some jitter pulse width output opto-coupler caused random noise within device itself After testing about 50 4N3 1 devices found behaved exactly same soit must characteristic device itself capacitor place no measur able jitter pulsewidth surprised though checking jit ter found radio system about microsecond jitter during normal operation guess just expected perfect Needless say little disappointed about very pleased Glitch Buster didnt add little technical talk folks out might interested started playing opto couplers figured would about 10-minute job get everything just right Well seems cases just thought knew worked After few hours knew doing something wrong because Continued Page 125 42 Model Aviation 1/32 scale plastic model kits Golden Age classic aircraft Colorful highly detailed miniatures Send $1 fully illustrated cata log other kits accessories DEPT MA 181 PAWNEE ST SAN MARCOS CALIFORNIA 92069 Winning Ideas FOURMOST 40 AIRFLO ENGINE MOUNT IDEAL FOR OUICKY 505 U I I iabout time. Its about time started enjoying benefits Master Jig 400 RC Modeler Magazine wrote .. rugged well made modelers accessory tool Model Airplane News called years better mousetrap. eases pain paintings coverings installing. worth penny. Isnt about time ordered Master Jig 4007 Mail toI TIDE DISTRIBUTORS PO Box 317/MAN 0385 Minto ND 58261 Phone 701 248-3001 Days 701 352-2667 Evenings ElMaster Jig 400 $12995 Shipping/Handling El Free brochure EJ1/2VHSvideotapc-53000loll []1/2BETAvideolape-S3O00[~J S2000 refunded tape returned wthm 30 days EZVISA WMASTERCARD DCHECK NAME ADDRESSI STATEZIPI MASTER JIG 400 uP udne] Radio Technique/Myers Continued page 39 spot-welded together heavy-duty straps Theres blob solder await ing wires will attach pack Does work tests prototype started engines 60 cu under tried Admittedly battery terminal voltage about 10 VDC run ning 6 VDC stalled particular engine needs full 12 volts ie normally connect starter directly automobile battery can add four cells pack problem you lose simple recharging ability discussed above Sullivan cable can connected starter motor function usual way struggling balky motor doing something else makes want save built-on pack Extra adapters provided fast slow charging reversing motor direction instructions show make yourself either left-handed righthanded starter package whole thing adds 10 ounces starter becomes 3 lb 11 oz can deduct several pounds field kit Larrys Piggy Back Starter Pack can ordered SR Batteries Box 28729 Maple Ave Bellport NY 11713 phone 516 286-0079 George M Myers 70 Froehliclz Farm Rd Hicksville NY 11801 Glitch Buster/Utasi Continued page 42 critter just wouldnt what expected point figured would good time read instructions Sure enough spec sheet said certain amount current drive re quired expected get nice clean rise time both photo diode photo transistor bumped-up current drive diode caused slightly improved waveform opto output Now seemed output would oscillate during ON time signal wouldnt cause total failure added about 10 microsec onds jitter completely unacceptable Adjusting current level photo-transistor got things back line have clean fast edges NO jitter mention just case plan substituting some other opto coupler personally know just about same Pay attention spec sheets data labeled current transfer ratio rise time vs Ic Ic vs diode current Itll save lot bench time Part Number Ra Rb Rc Ca Opto IC-2 PC board Case Q Quan tity 6 6 6 7 6 6 Parts List Value 100 ohms 47K ohms 15K ohms 001 mono ceramic 4N31 Motorola CD4049 GB-i Ace Servo Pacer Silver Seven 2N3904 NPN transistor An assembled unit furnished receiver servo leads available Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 $4000 PC board alone $750 prefer have system fur nished completely wired match radio contact EMS 714-637-2161 check pricing Foam Its Best Deal Best March 1985 125 FOAM WING CORES CUSTOM FOAM CLJTTING Ole Reliable 1938 Old Timer Doc Mathews Custom uut i-uO 102 Fuse 78 OCEAN STATE AEROMODEL ENGINEERING $14995 21 Jaycee Drc Dealer & Kit West Worwick RI 02893Manufacturers VISA 401 8288813Inquiries Invited Coming Soon / Scale F8F Bearcat MONOCOUPE 90A QUARTER SCALE QUADRA4 CYCLE SEND $200 FOR COMPLETE CATALOG OF FINE KITS IKON NWST PO Box 566 Auburn WA 98071 206941-8248 19.35 Engine Econo-Kit $5495 Deluxe-Kit $6495 Shipping Machine cut spruce & balsa Illustrated instructions F un-Line ModelsNOTE KANSAS RESIDENTS PO Box 2392 Shawnee Mission Kansas 66201
Edition: Model Aviation - 1985/03
Page Numbers: 40, 41, 42, 125
LAST MONTH discussed lot techniques have used past well present try rid air craft phenomenon known glitch es now us have heard hor ror stories about glitches caused long servo leads especially ailerons no real tangible explanation has come alonguntil now turns out best way attack problem could call problem simply imple ment correct cure before bother trying fly airplane especially true cable runs ser vos excess 48 Theres just no point taking chances see will work such simple effective alternative like Glitch Buster Glitch Buster installed aircraft youll have several factors actual ly working advantage First can use small battery pack switch harness came radio power receiver itself means receiver will get nice clean trash-free DC voltage power also means receiver will operate reliably several hours single charge least radio link ground will assured entire time air Next have ad vantage optical coupling between receiver s decoder outputs servos take look schematic Glitch Buster will see three wires coming channel SCHEMATIC channel RaRc I0Oohms33K 4N31IN Reciever J RbCa 47K001 Signal Gnd receiver connect input side opto-coupler through two resistors transistor transistor booster decoder output drives light-emitting diode inside 4N3 1 package beam infrared light carries signal across small gap clear insulating material photo-tran sistor across course diode transistor sealed inside little Servo Cal V 001 4049 OUT Signal 8 Servo Gnd CHANNEL II 1213141516 PIN IN PIN OUT II 51719111 14 12 1416110112 15 Left Heres PC board ready go etch own sure check tiny shorts opens traces An early check may save much time later Right First step soider resistors capacitors easiest part photos author Left Next put transistors integrated circuit careful handling 4049 IC sensitive static charges until soldered board Finally solder together wires come receiver go servos use Deans connectors might want use block connector servo side save wiring bulk Right soldering has completed clean off flux acetone lacquer thinner PC bottom should show bright shiny solder joints 40 Model Aviation youve built few electronics kits will have know-how construct de vice has cured big-airplane glitch problem author long leads heavy-duty servos Part 2EJoe Utasi six-pin package keep light outside world upsetting things photo-transistor picks up light signal converts back elec trical waveform Pin 5 4N3 1 pack age Since neither signal nor power leads connected receiver noise current spikes possible RF interference servo wiring ex posed can penetrate upset receiver circuitry Since waveform point upside down signals optocoupler routed 4049 inverter buffer does two things gets signal turned around correctly boosts high servo battery pack will allow Since receivers put out servo pulse between three four volts because internal voltage regula tors extra volt represents about 20% increase signal amplitude reaching servo especially im portant flying area prone lot RF interference paging systems power lines oth sources Lastly since system must use separate alrborne battery servo power servo motor current spikes motor noise stop short getting back receiver bottom line youve taken possible step pre vent potential glitches doing system shown helped Futa ba J series FM system tremendously 00 00w O4 oo ign Rb G n d gnal Rb Gn d Signal G n Ra V Buss Buss OO OO Gnd Rb Sign iv Component placement wiring connections PC board shown gray tint no other combination gadgets would work same irplane flew just fine JR radio borrowed system give back its owner Some systems tolerant noise long leads others its just worth taking chance can something about Glitch Buster will help cope better problems created long servo wiring dont forget backup battery pack can also help avoid crash believe single pack receiver adequate well cared March 1985 41 Bottom view PC board twotimes final size Another Giitch Buster finishedready abie put nasty giitches away good eR TOW HOOK RELEASE Price 5890 Afterof Simplest reliable device available line released hook retracts unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Vs oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG 4 VIBRATION FREE PRICE $300 PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 cushioned adequately air craft would still recommend backup pack servo side Glitch Buster transparent far rest airplane systems concerned power leads servo pack GB board can routed through battery backup system just normally would Assembly Glitch Buster very sim ple goes fast First solder resistors capacitors Next come transistors integrated circuits Just make sure get orientation marks notch dot end chip going proper direction Check parts drawing assembly photo graphs sure last thing to solder pigtails get plugged receiver leads go ing servos leads going servos should have power ground wires capable handling high currents minimum voltage drop new Ace RC heavyduty wire perfect As matter fact prewired Ace RC heavy-duty switch harness can used servo side system absolutely no changes After soldering finished clean off flux residue some acetone lacquer thinner inspect finished board cold solder joints pins may have missed looks OK place board plastic box plug together board size chosen specifically fit inside plastic case Ace RC uses Servo Pacer Silver Seven receiver dont believe size could have reduced further making project impossible build last point folks like know details capacitor goes Pin 6 4N3 1 ground necessary eliminate some jitter pulse width output opto-coupler caused random noise within device itself After testing about 50 4N3 1 devices found behaved exactly same soit must characteristic device itself capacitor place no measur able jitter pulsewidth surprised though checking jit ter found radio system about microsecond jitter during normal operation guess just expected perfect Needless say little disappointed about very pleased Glitch Buster didnt add little technical talk folks out might interested started playing opto couplers figured would about 10-minute job get everything just right Well seems cases just thought knew worked After few hours knew doing something wrong because Continued Page 125 42 Model Aviation 1/32 scale plastic model kits Golden Age classic aircraft Colorful highly detailed miniatures Send $1 fully illustrated cata log other kits accessories DEPT MA 181 PAWNEE ST SAN MARCOS CALIFORNIA 92069 Winning Ideas FOURMOST 40 AIRFLO ENGINE MOUNT IDEAL FOR OUICKY 505 U I I iabout time. Its about time started enjoying benefits Master Jig 400 RC Modeler Magazine wrote .. rugged well made modelers accessory tool Model Airplane News called years better mousetrap. eases pain paintings coverings installing. worth penny. Isnt about time ordered Master Jig 4007 Mail toI TIDE DISTRIBUTORS PO Box 317/MAN 0385 Minto ND 58261 Phone 701 248-3001 Days 701 352-2667 Evenings ElMaster Jig 400 $12995 Shipping/Handling El Free brochure EJ1/2VHSvideotapc-53000loll []1/2BETAvideolape-S3O00[~J S2000 refunded tape returned wthm 30 days EZVISA WMASTERCARD DCHECK NAME ADDRESSI STATEZIPI MASTER JIG 400 uP udne] Radio Technique/Myers Continued page 39 spot-welded together heavy-duty straps Theres blob solder await ing wires will attach pack Does work tests prototype started engines 60 cu under tried Admittedly battery terminal voltage about 10 VDC run ning 6 VDC stalled particular engine needs full 12 volts ie normally connect starter directly automobile battery can add four cells pack problem you lose simple recharging ability discussed above Sullivan cable can connected starter motor function usual way struggling balky motor doing something else makes want save built-on pack Extra adapters provided fast slow charging reversing motor direction instructions show make yourself either left-handed righthanded starter package whole thing adds 10 ounces starter becomes 3 lb 11 oz can deduct several pounds field kit Larrys Piggy Back Starter Pack can ordered SR Batteries Box 28729 Maple Ave Bellport NY 11713 phone 516 286-0079 George M Myers 70 Froehliclz Farm Rd Hicksville NY 11801 Glitch Buster/Utasi Continued page 42 critter just wouldnt what expected point figured would good time read instructions Sure enough spec sheet said certain amount current drive re quired expected get nice clean rise time both photo diode photo transistor bumped-up current drive diode caused slightly improved waveform opto output Now seemed output would oscillate during ON time signal wouldnt cause total failure added about 10 microsec onds jitter completely unacceptable Adjusting current level photo-transistor got things back line have clean fast edges NO jitter mention just case plan substituting some other opto coupler personally know just about same Pay attention spec sheets data labeled current transfer ratio rise time vs Ic Ic vs diode current Itll save lot bench time Part Number Ra Rb Rc Ca Opto IC-2 PC board Case Q Quan tity 6 6 6 7 6 6 Parts List Value 100 ohms 47K ohms 15K ohms 001 mono ceramic 4N31 Motorola CD4049 GB-i Ace Servo Pacer Silver Seven 2N3904 NPN transistor An assembled unit furnished receiver servo leads available Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 $4000 PC board alone $750 prefer have system fur nished completely wired match radio contact EMS 714-637-2161 check pricing Foam Its Best Deal Best March 1985 125 FOAM WING CORES CUSTOM FOAM CLJTTING Ole Reliable 1938 Old Timer Doc Mathews Custom uut i-uO 102 Fuse 78 OCEAN STATE AEROMODEL ENGINEERING $14995 21 Jaycee Drc Dealer & Kit West Worwick RI 02893Manufacturers VISA 401 8288813Inquiries Invited Coming Soon / Scale F8F Bearcat MONOCOUPE 90A QUARTER SCALE QUADRA4 CYCLE SEND $200 FOR COMPLETE CATALOG OF FINE KITS IKON NWST PO Box 566 Auburn WA 98071 206941-8248 19.35 Engine Econo-Kit $5495 Deluxe-Kit $6495 Shipping Machine cut spruce & balsa Illustrated instructions F un-Line ModelsNOTE KANSAS RESIDENTS PO Box 2392 Shawnee Mission Kansas 66201
Edition: Model Aviation - 1985/03
Page Numbers: 40, 41, 42, 125
LAST MONTH discussed lot techniques have used past well present try rid air craft phenomenon known glitch es now us have heard hor ror stories about glitches caused long servo leads especially ailerons no real tangible explanation has come alonguntil now turns out best way attack problem could call problem simply imple ment correct cure before bother trying fly airplane especially true cable runs ser vos excess 48 Theres just no point taking chances see will work such simple effective alternative like Glitch Buster Glitch Buster installed aircraft youll have several factors actual ly working advantage First can use small battery pack switch harness came radio power receiver itself means receiver will get nice clean trash-free DC voltage power also means receiver will operate reliably several hours single charge least radio link ground will assured entire time air Next have ad vantage optical coupling between receiver s decoder outputs servos take look schematic Glitch Buster will see three wires coming channel SCHEMATIC channel RaRc I0Oohms33K 4N31IN Reciever J RbCa 47K001 Signal Gnd receiver connect input side opto-coupler through two resistors transistor transistor booster decoder output drives light-emitting diode inside 4N3 1 package beam infrared light carries signal across small gap clear insulating material photo-tran sistor across course diode transistor sealed inside little Servo Cal V 001 4049 OUT Signal 8 Servo Gnd CHANNEL II 1213141516 PIN IN PIN OUT II 51719111 14 12 1416110112 15 Left Heres PC board ready go etch own sure check tiny shorts opens traces An early check may save much time later Right First step soider resistors capacitors easiest part photos author Left Next put transistors integrated circuit careful handling 4049 IC sensitive static charges until soldered board Finally solder together wires come receiver go servos use Deans connectors might want use block connector servo side save wiring bulk Right soldering has completed clean off flux acetone lacquer thinner PC bottom should show bright shiny solder joints 40 Model Aviation youve built few electronics kits will have know-how construct de vice has cured big-airplane glitch problem author long leads heavy-duty servos Part 2EJoe Utasi six-pin package keep light outside world upsetting things photo-transistor picks up light signal converts back elec trical waveform Pin 5 4N3 1 pack age Since neither signal nor power leads connected receiver noise current spikes possible RF interference servo wiring ex posed can penetrate upset receiver circuitry Since waveform point upside down signals optocoupler routed 4049 inverter buffer does two things gets signal turned around correctly boosts high servo battery pack will allow Since receivers put out servo pulse between three four volts because internal voltage regula tors extra volt represents about 20% increase signal amplitude reaching servo especially im portant flying area prone lot RF interference paging systems power lines oth sources Lastly since system must use separate alrborne battery servo power servo motor current spikes motor noise stop short getting back receiver bottom line youve taken possible step pre vent potential glitches doing system shown helped Futa ba J series FM system tremendously 00 00w O4 oo ign Rb G n d gnal Rb Gn d Signal G n Ra V Buss Buss OO OO Gnd Rb Sign iv Component placement wiring connections PC board shown gray tint no other combination gadgets would work same irplane flew just fine JR radio borrowed system give back its owner Some systems tolerant noise long leads others its just worth taking chance can something about Glitch Buster will help cope better problems created long servo wiring dont forget backup battery pack can also help avoid crash believe single pack receiver adequate well cared March 1985 41 Bottom view PC board twotimes final size Another Giitch Buster finishedready abie put nasty giitches away good eR TOW HOOK RELEASE Price 5890 Afterof Simplest reliable device available line released hook retracts unit leaving SMOOTH surface bottom aircraft No special attachments required N eight Vs oz 0491051 AIRFLO ENGINE MOUNT REDUCES DRAG 4 VIBRATION FREE PRICE $300 PRICE $630 OTHER FOURMOST PRODUCTS Fuel Fitting Sets Fuel Shut Off Fuel Manifold Gapless Hinges Gapless Hinge Slotter Strut Fairings Cockpit Coaming ST Send SASE Complete Information 4040 24th Ave Forest Grove OR 97116 PRODUCTS Phone 503 357-2732 cushioned adequately air craft would still recommend backup pack servo side Glitch Buster transparent far rest airplane systems concerned power leads servo pack GB board can routed through battery backup system just normally would Assembly Glitch Buster very sim ple goes fast First solder resistors capacitors Next come transistors integrated circuits Just make sure get orientation marks notch dot end chip going proper direction Check parts drawing assembly photo graphs sure last thing to solder pigtails get plugged receiver leads go ing servos leads going servos should have power ground wires capable handling high currents minimum voltage drop new Ace RC heavyduty wire perfect As matter fact prewired Ace RC heavy-duty switch harness can used servo side system absolutely no changes After soldering finished clean off flux residue some acetone lacquer thinner inspect finished board cold solder joints pins may have missed looks OK place board plastic box plug together board size chosen specifically fit inside plastic case Ace RC uses Servo Pacer Silver Seven receiver dont believe size could have reduced further making project impossible build last point folks like know details capacitor goes Pin 6 4N3 1 ground necessary eliminate some jitter pulse width output opto-coupler caused random noise within device itself After testing about 50 4N3 1 devices found behaved exactly same soit must characteristic device itself capacitor place no measur able jitter pulsewidth surprised though checking jit ter found radio system about microsecond jitter during normal operation guess just expected perfect Needless say little disappointed about very pleased Glitch Buster didnt add little technical talk folks out might interested started playing opto couplers figured would about 10-minute job get everything just right Well seems cases just thought knew worked After few hours knew doing something wrong because Continued Page 125 42 Model Aviation 1/32 scale plastic model kits Golden Age classic aircraft Colorful highly detailed miniatures Send $1 fully illustrated cata log other kits accessories DEPT MA 181 PAWNEE ST SAN MARCOS CALIFORNIA 92069 Winning Ideas FOURMOST 40 AIRFLO ENGINE MOUNT IDEAL FOR OUICKY 505 U I I iabout time. Its about time started enjoying benefits Master Jig 400 RC Modeler Magazine wrote .. rugged well made modelers accessory tool Model Airplane News called years better mousetrap. eases pain paintings coverings installing. worth penny. Isnt about time ordered Master Jig 4007 Mail toI TIDE DISTRIBUTORS PO Box 317/MAN 0385 Minto ND 58261 Phone 701 248-3001 Days 701 352-2667 Evenings ElMaster Jig 400 $12995 Shipping/Handling El Free brochure EJ1/2VHSvideotapc-53000loll []1/2BETAvideolape-S3O00[~J S2000 refunded tape returned wthm 30 days EZVISA WMASTERCARD DCHECK NAME ADDRESSI STATEZIPI MASTER JIG 400 uP udne] Radio Technique/Myers Continued page 39 spot-welded together heavy-duty straps Theres blob solder await ing wires will attach pack Does work tests prototype started engines 60 cu under tried Admittedly battery terminal voltage about 10 VDC run ning 6 VDC stalled particular engine needs full 12 volts ie normally connect starter directly automobile battery can add four cells pack problem you lose simple recharging ability discussed above Sullivan cable can connected starter motor function usual way struggling balky motor doing something else makes want save built-on pack Extra adapters provided fast slow charging reversing motor direction instructions show make yourself either left-handed righthanded starter package whole thing adds 10 ounces starter becomes 3 lb 11 oz can deduct several pounds field kit Larrys Piggy Back Starter Pack can ordered SR Batteries Box 28729 Maple Ave Bellport NY 11713 phone 516 286-0079 George M Myers 70 Froehliclz Farm Rd Hicksville NY 11801 Glitch Buster/Utasi Continued page 42 critter just wouldnt what expected point figured would good time read instructions Sure enough spec sheet said certain amount current drive re quired expected get nice clean rise time both photo diode photo transistor bumped-up current drive diode caused slightly improved waveform opto output Now seemed output would oscillate during ON time signal wouldnt cause total failure added about 10 microsec onds jitter completely unacceptable Adjusting current level photo-transistor got things back line have clean fast edges NO jitter mention just case plan substituting some other opto coupler personally know just about same Pay attention spec sheets data labeled current transfer ratio rise time vs Ic Ic vs diode current Itll save lot bench time Part Number Ra Rb Rc Ca Opto IC-2 PC board Case Q Quan tity 6 6 6 7 6 6 Parts List Value 100 ohms 47K ohms 15K ohms 001 mono ceramic 4N31 Motorola CD4049 GB-i Ace Servo Pacer Silver Seven 2N3904 NPN transistor An assembled unit furnished receiver servo leads available Jomar Products 2028 Knightsbridge Dr Cincinnati OH 45244 $4000 PC board alone $750 prefer have system fur nished completely wired match radio contact EMS 714-637-2161 check pricing Foam Its Best Deal Best March 1985 125 FOAM WING CORES CUSTOM FOAM CLJTTING Ole Reliable 1938 Old Timer Doc Mathews Custom uut i-uO 102 Fuse 78 OCEAN STATE AEROMODEL ENGINEERING $14995 21 Jaycee Drc Dealer & Kit West Worwick RI 02893Manufacturers VISA 401 8288813Inquiries Invited Coming Soon / Scale F8F Bearcat MONOCOUPE 90A QUARTER SCALE QUADRA4 CYCLE SEND $200 FOR COMPLETE CATALOG OF FINE KITS IKON NWST PO Box 566 Auburn WA 98071 206941-8248 19.35 Engine Econo-Kit $5495 Deluxe-Kit $6495 Shipping Machine cut spruce & balsa Illustrated instructions F un-Line ModelsNOTE KANSAS RESIDENTS PO Box 2392 Shawnee Mission Kansas 66201
