MY ARTICLE published March 1987 issue Model Aviation apparently generated lot interest automatic mon itoring 31M possibilities flying field received quite lot mail concern ing project Some people wrote asking additional information others say system worked liked Most mail lately however has request ing update new frequencies now available Keeping mind requests criticisms haywire ap proach used original version set out write final chapter onsite monitoring available spectrum Construction modular al lows easy customizing individual needs would also allow retrofitting ex isting boards new brain brain constructed printed cir cuit board easy building reliable perThe Final Chapter Whistle Blows Dont Fly frequency con trol board has mod ern electronics head off modeler-tomodeler interference problems Its up date authors 1987 system able handle new RC chan nels EM Dennis Tierney formance Because number new RC fre July 1989 89 board used authors flying field simplest implementations controller board presently set up handling just even-numbered channels adequate space addition odd-numbered channels required About author has employed communications industry past 15 years holds FCC license past eight years has has primarily involved digital telemetry de sign off-premise control applications major natural gas pipeline company interest model aviation actually sparked testing done commercial one-way controls now sand wiched between aircraft frequencies work turned play hes glad did LeTt me back side board shows method installation Tiexiollity CT inc ieaa aress Iligni MUIK o circuiiry Ofl inc cir cult board PC board homemade Professional boards much higher quality As can seen external circuitry minimal 90 Model Aviation quencies weve acquired possibility adding original design using diode OR gates soon vanished over 120 possible triplet combinations out today Granted since band now oc cupies nearly whole MHz some triplets would never cause problem Since aim however find definitive solution possible in-band combinations would included Also design criteria should include prospective channels just cur rently use new design has capa bility monitor 48 channels 11-58 should choose implement appar ent easiest way accomplish goal mi croprocessor microprocessor cir cuitry turned Out actually sim ple selected 4 BTI t 8V AMi Z80 because large number internal registers Since registers could used short-term data manipulation no RAM required 27C16 EPROM provided enough program mem ory CMOS input output buffers high-impedance low-pass filters RF re jection completed heart system power supply 500-mAh flight pack fully charged pack will provide about 40 hours power switches pin sensing made scrap sheet metal Since switches original board service local field nearly three ON v4 1 OFF Ji su 9 1D DELL currHfl annunciator UTI ln pack 41 jack July 1989 91 no ousiness ena OT circuit boara snowing tne microprocessor support components Note insulators installed mounting studs Plus side board minus other years now still causing prob lems applied aint broke dont fix principle Add on-off switch low-current annunciator system complete implementation system left rather open-ended couple reasons have privileged visit several flying fields traveling Ohio River Valley Mississippi River Delta busi ness fields visited frequency control sort another big dif ference some clubs choose have members place markers board flying others choose provide markers remove flying addition some clubs require AMA membership card posted use channel suppose aids re covery markers Clothespins seem preferred markers reasons actual layout can arrangement suits fancy long switch contact connected appropriate mon itor input RF bypassing allows extreme flexibility regard lead length layout choose use portion allowa ble frequencies ie even-numbered channels just use jumper re place associ ated capacitor leave out resis tor oddnumbered channels future should decide use frequen cies simply re move jumper install switch filter components choose put pins board instead remov ing substi tute input buf fers 74HC244 inverting buffers hav ing identical pinout 74HC240 Tie unused input buffers high use jumper place resistor 31M board following dis cussion assumes pins board will removed use Should opt place pins board opera tions will re versed power applied whistle turned short time end DC test processor tests verify pins board beep generated signal system ready normal operation Should whistle continue sound after beep switch making contact somewhere open contacts found corrected whistle silences system now ready normal oper ation Whenever pin removed re placed short beep activated pro cessor checks see intermod triplet present whistle continues sound until offending pins re placed technically curious U 1 4 MHz CMOS Z80 microprocessor driven 4 MHz clock turn powered 4 MHz crystal oscillator cir cuit UlO-b buffered U10-a choice clock frequency arbi trary Microprocessor circuits frequently generate several harmonics clock fre quency since square wave 18th harmonic would therefore 720 MHz 19th 760 MHz either side band concerned Although high-impedance CMOS circuitry low current drain characteristically lends itself low radiation levels nev ertheless took precaution checking finished board spectrum ana lyzer No detectable signals could found beyond approximately six inches power-on reset circuitry consists Ull-b C3 R3 power ap plied C3 begins take charge re sulting low Ul 1-b-b presets flipflop causes Q* output drop re setting processor U 11-a also indu ces illegal condition simultaneous ac tivity both set clear states condition exists both Q Q* outputs reach high levels As C3 charge reaches approximately 2A V et condition cleared flip-flop al lowed operate normally next low-to-high transitions clock subsequent ones low D input clocked through caus ing Q* output rise reset thus removed processor program execution begins Simultaneously Ul 1-a released its illegal dual state flip-flop assumes clear state Ul 1-a drives bell output duration reset pulse Sounding bell point simple way subject battery fullload test since cells opera tional bell either wont sound will sound very weakly alerting opera tor problem exists program stored 27C16 CMOS EPROM U2 Since memory system CS* line can tied directly processor MRQ* output Since EPROM read-only unit OE enabled processor RD* U3 through U8 tristate input buffers enabled port address decoder U9 internal gates provided 74HC 138 used enable decoder IORQ* RD* processor true Since system requires six ports ad dress lines 0 through 2 decoded ports accessed program 5 through 0 output bell through Ul 1-a being device written allows processor WT* IORQ* lines ORd U 10-c derive clock flip-flop DO data input 1 data line turns bell 0 turns off bell set power-up Resistors Ri l-R58 simply pullup re sistors switches Since switches normally closed largest practical value chosen reduce current con sumption monitor mode Cl 1-C58 RF bypass capacitors allow long leads switches operating presence lowpower transmitters ca pacitors minimize energy being coupled switch leads energy might otherwise radiated atmo sphere Software switches read Continued page 175 92 Model Aviation input section occupies end board Look carefully photo will notice jumpers unused channels pad ia screwed plane wire will securely pressed between pad fuselage minimize wire failure point Help needed 89 Nats received letter Bob Dalton Wayne Foster requesting sistance during years Nats Richland WA year Nats manpower requirement CL Racing extensive Bob has asked anyone can provide timing modelprocessing assistance please drop him note 1455 South Peacehaven Rd Clemmons NC 27012 As always solicit comments photos share readers Whistle/Tierney Continued page 92 stored eight-bit bytes inter nal registers processor pur poses entire string bits can consid ered 48-bit word processor contin uously scans switches compares new input switch state previously stored its memory Any change switch state will stored 31M evaluation will begin bell set task begins processor applies mask containing possible triplets could occur bit pattern mask simplified terms oriented according bit position triplets mask recognize bit 1 part triplet method requires some time during evaluation process bit must first accomplish entire bit pattern shifted bit position mask reapplied process continued until 46 48 bits have shifted bit #1 position remaining two shifts performed since two bits cant constitute triplet no match found bell turned off scanning continues Complicated time-consum ing sounds execution process times duration beep heard pin removed replaced however match found bell re mains program returns switch scanning Since change state switch contact what triggers evalua tion process replacement of offending pins will result no-match eval uation turning bell off Construction Since full-size circuit board pattern approximately 86 41 beyond scope article publish etching drilling guide light fact have made arrangements local company provide partial kits completely assembled tested con trollers company actually stu dent coalition son mem ber will anything mow grass custom fabricating electronic cir cuit boards little help dad have built couple Eagle 63s pricing has established follows MUM EKE U BUUEEU SIG GLOW FUEL MANUFACTURED WITH THE PUREST FINEST QUALITY INGREDIENTS AVAILABLE * Superior Igniters Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINT QUART GALLON 0% Nitromethane$1075 5% Nitromethane$365$525$1275 10% Nitromethane$415$550$1475 15% Nitromethane$430$635$1675 25% Nitromethane$515$795$2195 35% Nitromethane$595$925$2695 SIG PREMIUM 4-STROKE FUEL 10% Nitromethane$1425 15% Nitromethane$1625 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPrices sobjoct change withoot notice See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO Montezuma IA 50171 2X photo-ready etching drilling guide $500 Custom-programmed EPROM$1250 Etched drilled printed circuit board plated-through holes$2500 Assembled tested controller board $10000 address SJB Custom Attn Jason Tierney 9788 Ralph Road Whitesville KY 42378 sure specify interested RC Pinboard Controller project bit costly earlier model hope its simplicity versatility can indeed write final chapter third-order intermod monitoring flying field Happy Flying Sea Dart/Gilgenbach Continued page 100 fan intake exhaust primarily concerned about maximizing static thrust taking off water Since top speed full-size Sea Dart 670 mph 1/9-scale model wouldnt have go over 100 mph give good scale effect Tom also recommended build model light possible achieve takeoff July 1989 175
Edition: Model Aviation - 1989/07
Page Numbers: 89, 90, 91, 92, 175
MY ARTICLE published March 1987 issue Model Aviation apparently generated lot interest automatic mon itoring 31M possibilities flying field received quite lot mail concern ing project Some people wrote asking additional information others say system worked liked Most mail lately however has request ing update new frequencies now available Keeping mind requests criticisms haywire ap proach used original version set out write final chapter onsite monitoring available spectrum Construction modular al lows easy customizing individual needs would also allow retrofitting ex isting boards new brain brain constructed printed cir cuit board easy building reliable perThe Final Chapter Whistle Blows Dont Fly frequency con trol board has mod ern electronics head off modeler-tomodeler interference problems Its up date authors 1987 system able handle new RC chan nels EM Dennis Tierney formance Because number new RC fre July 1989 89 board used authors flying field simplest implementations controller board presently set up handling just even-numbered channels adequate space addition odd-numbered channels required About author has employed communications industry past 15 years holds FCC license past eight years has has primarily involved digital telemetry de sign off-premise control applications major natural gas pipeline company interest model aviation actually sparked testing done commercial one-way controls now sand wiched between aircraft frequencies work turned play hes glad did LeTt me back side board shows method installation Tiexiollity CT inc ieaa aress Iligni MUIK o circuiiry Ofl inc cir cult board PC board homemade Professional boards much higher quality As can seen external circuitry minimal 90 Model Aviation quencies weve acquired possibility adding original design using diode OR gates soon vanished over 120 possible triplet combinations out today Granted since band now oc cupies nearly whole MHz some triplets would never cause problem Since aim however find definitive solution possible in-band combinations would included Also design criteria should include prospective channels just cur rently use new design has capa bility monitor 48 channels 11-58 should choose implement appar ent easiest way accomplish goal mi croprocessor microprocessor cir cuitry turned Out actually sim ple selected 4 BTI t 8V AMi Z80 because large number internal registers Since registers could used short-term data manipulation no RAM required 27C16 EPROM provided enough program mem ory CMOS input output buffers high-impedance low-pass filters RF re jection completed heart system power supply 500-mAh flight pack fully charged pack will provide about 40 hours power switches pin sensing made scrap sheet metal Since switches original board service local field nearly three ON v4 1 OFF Ji su 9 1D DELL currHfl annunciator UTI ln pack 41 jack July 1989 91 no ousiness ena OT circuit boara snowing tne microprocessor support components Note insulators installed mounting studs Plus side board minus other years now still causing prob lems applied aint broke dont fix principle Add on-off switch low-current annunciator system complete implementation system left rather open-ended couple reasons have privileged visit several flying fields traveling Ohio River Valley Mississippi River Delta busi ness fields visited frequency control sort another big dif ference some clubs choose have members place markers board flying others choose provide markers remove flying addition some clubs require AMA membership card posted use channel suppose aids re covery markers Clothespins seem preferred markers reasons actual layout can arrangement suits fancy long switch contact connected appropriate mon itor input RF bypassing allows extreme flexibility regard lead length layout choose use portion allowa ble frequencies ie even-numbered channels just use jumper re place associ ated capacitor leave out resis tor oddnumbered channels future should decide use frequen cies simply re move jumper install switch filter components choose put pins board instead remov ing substi tute input buf fers 74HC244 inverting buffers hav ing identical pinout 74HC240 Tie unused input buffers high use jumper place resistor 31M board following dis cussion assumes pins board will removed use Should opt place pins board opera tions will re versed power applied whistle turned short time end DC test processor tests verify pins board beep generated signal system ready normal operation Should whistle continue sound after beep switch making contact somewhere open contacts found corrected whistle silences system now ready normal oper ation Whenever pin removed re placed short beep activated pro cessor checks see intermod triplet present whistle continues sound until offending pins re placed technically curious U 1 4 MHz CMOS Z80 microprocessor driven 4 MHz clock turn powered 4 MHz crystal oscillator cir cuit UlO-b buffered U10-a choice clock frequency arbi trary Microprocessor circuits frequently generate several harmonics clock fre quency since square wave 18th harmonic would therefore 720 MHz 19th 760 MHz either side band concerned Although high-impedance CMOS circuitry low current drain characteristically lends itself low radiation levels nev ertheless took precaution checking finished board spectrum ana lyzer No detectable signals could found beyond approximately six inches power-on reset circuitry consists Ull-b C3 R3 power ap plied C3 begins take charge re sulting low Ul 1-b-b presets flipflop causes Q* output drop re setting processor U 11-a also indu ces illegal condition simultaneous ac tivity both set clear states condition exists both Q Q* outputs reach high levels As C3 charge reaches approximately 2A V et condition cleared flip-flop al lowed operate normally next low-to-high transitions clock subsequent ones low D input clocked through caus ing Q* output rise reset thus removed processor program execution begins Simultaneously Ul 1-a released its illegal dual state flip-flop assumes clear state Ul 1-a drives bell output duration reset pulse Sounding bell point simple way subject battery fullload test since cells opera tional bell either wont sound will sound very weakly alerting opera tor problem exists program stored 27C16 CMOS EPROM U2 Since memory system CS* line can tied directly processor MRQ* output Since EPROM read-only unit OE enabled processor RD* U3 through U8 tristate input buffers enabled port address decoder U9 internal gates provided 74HC 138 used enable decoder IORQ* RD* processor true Since system requires six ports ad dress lines 0 through 2 decoded ports accessed program 5 through 0 output bell through Ul 1-a being device written allows processor WT* IORQ* lines ORd U 10-c derive clock flip-flop DO data input 1 data line turns bell 0 turns off bell set power-up Resistors Ri l-R58 simply pullup re sistors switches Since switches normally closed largest practical value chosen reduce current con sumption monitor mode Cl 1-C58 RF bypass capacitors allow long leads switches operating presence lowpower transmitters ca pacitors minimize energy being coupled switch leads energy might otherwise radiated atmo sphere Software switches read Continued page 175 92 Model Aviation input section occupies end board Look carefully photo will notice jumpers unused channels pad ia screwed plane wire will securely pressed between pad fuselage minimize wire failure point Help needed 89 Nats received letter Bob Dalton Wayne Foster requesting sistance during years Nats Richland WA year Nats manpower requirement CL Racing extensive Bob has asked anyone can provide timing modelprocessing assistance please drop him note 1455 South Peacehaven Rd Clemmons NC 27012 As always solicit comments photos share readers Whistle/Tierney Continued page 92 stored eight-bit bytes inter nal registers processor pur poses entire string bits can consid ered 48-bit word processor contin uously scans switches compares new input switch state previously stored its memory Any change switch state will stored 31M evaluation will begin bell set task begins processor applies mask containing possible triplets could occur bit pattern mask simplified terms oriented according bit position triplets mask recognize bit 1 part triplet method requires some time during evaluation process bit must first accomplish entire bit pattern shifted bit position mask reapplied process continued until 46 48 bits have shifted bit #1 position remaining two shifts performed since two bits cant constitute triplet no match found bell turned off scanning continues Complicated time-consum ing sounds execution process times duration beep heard pin removed replaced however match found bell re mains program returns switch scanning Since change state switch contact what triggers evalua tion process replacement of offending pins will result no-match eval uation turning bell off Construction Since full-size circuit board pattern approximately 86 41 beyond scope article publish etching drilling guide light fact have made arrangements local company provide partial kits completely assembled tested con trollers company actually stu dent coalition son mem ber will anything mow grass custom fabricating electronic cir cuit boards little help dad have built couple Eagle 63s pricing has established follows MUM EKE U BUUEEU SIG GLOW FUEL MANUFACTURED WITH THE PUREST FINEST QUALITY INGREDIENTS AVAILABLE * Superior Igniters Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINT QUART GALLON 0% Nitromethane$1075 5% Nitromethane$365$525$1275 10% Nitromethane$415$550$1475 15% Nitromethane$430$635$1675 25% Nitromethane$515$795$2195 35% Nitromethane$595$925$2695 SIG PREMIUM 4-STROKE FUEL 10% Nitromethane$1425 15% Nitromethane$1625 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPrices sobjoct change withoot notice See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO Montezuma IA 50171 2X photo-ready etching drilling guide $500 Custom-programmed EPROM$1250 Etched drilled printed circuit board plated-through holes$2500 Assembled tested controller board $10000 address SJB Custom Attn Jason Tierney 9788 Ralph Road Whitesville KY 42378 sure specify interested RC Pinboard Controller project bit costly earlier model hope its simplicity versatility can indeed write final chapter third-order intermod monitoring flying field Happy Flying Sea Dart/Gilgenbach Continued page 100 fan intake exhaust primarily concerned about maximizing static thrust taking off water Since top speed full-size Sea Dart 670 mph 1/9-scale model wouldnt have go over 100 mph give good scale effect Tom also recommended build model light possible achieve takeoff July 1989 175
Edition: Model Aviation - 1989/07
Page Numbers: 89, 90, 91, 92, 175
MY ARTICLE published March 1987 issue Model Aviation apparently generated lot interest automatic mon itoring 31M possibilities flying field received quite lot mail concern ing project Some people wrote asking additional information others say system worked liked Most mail lately however has request ing update new frequencies now available Keeping mind requests criticisms haywire ap proach used original version set out write final chapter onsite monitoring available spectrum Construction modular al lows easy customizing individual needs would also allow retrofitting ex isting boards new brain brain constructed printed cir cuit board easy building reliable perThe Final Chapter Whistle Blows Dont Fly frequency con trol board has mod ern electronics head off modeler-tomodeler interference problems Its up date authors 1987 system able handle new RC chan nels EM Dennis Tierney formance Because number new RC fre July 1989 89 board used authors flying field simplest implementations controller board presently set up handling just even-numbered channels adequate space addition odd-numbered channels required About author has employed communications industry past 15 years holds FCC license past eight years has has primarily involved digital telemetry de sign off-premise control applications major natural gas pipeline company interest model aviation actually sparked testing done commercial one-way controls now sand wiched between aircraft frequencies work turned play hes glad did LeTt me back side board shows method installation Tiexiollity CT inc ieaa aress Iligni MUIK o circuiiry Ofl inc cir cult board PC board homemade Professional boards much higher quality As can seen external circuitry minimal 90 Model Aviation quencies weve acquired possibility adding original design using diode OR gates soon vanished over 120 possible triplet combinations out today Granted since band now oc cupies nearly whole MHz some triplets would never cause problem Since aim however find definitive solution possible in-band combinations would included Also design criteria should include prospective channels just cur rently use new design has capa bility monitor 48 channels 11-58 should choose implement appar ent easiest way accomplish goal mi croprocessor microprocessor cir cuitry turned Out actually sim ple selected 4 BTI t 8V AMi Z80 because large number internal registers Since registers could used short-term data manipulation no RAM required 27C16 EPROM provided enough program mem ory CMOS input output buffers high-impedance low-pass filters RF re jection completed heart system power supply 500-mAh flight pack fully charged pack will provide about 40 hours power switches pin sensing made scrap sheet metal Since switches original board service local field nearly three ON v4 1 OFF Ji su 9 1D DELL currHfl annunciator UTI ln pack 41 jack July 1989 91 no ousiness ena OT circuit boara snowing tne microprocessor support components Note insulators installed mounting studs Plus side board minus other years now still causing prob lems applied aint broke dont fix principle Add on-off switch low-current annunciator system complete implementation system left rather open-ended couple reasons have privileged visit several flying fields traveling Ohio River Valley Mississippi River Delta busi ness fields visited frequency control sort another big dif ference some clubs choose have members place markers board flying others choose provide markers remove flying addition some clubs require AMA membership card posted use channel suppose aids re covery markers Clothespins seem preferred markers reasons actual layout can arrangement suits fancy long switch contact connected appropriate mon itor input RF bypassing allows extreme flexibility regard lead length layout choose use portion allowa ble frequencies ie even-numbered channels just use jumper re place associ ated capacitor leave out resis tor oddnumbered channels future should decide use frequen cies simply re move jumper install switch filter components choose put pins board instead remov ing substi tute input buf fers 74HC244 inverting buffers hav ing identical pinout 74HC240 Tie unused input buffers high use jumper place resistor 31M board following dis cussion assumes pins board will removed use Should opt place pins board opera tions will re versed power applied whistle turned short time end DC test processor tests verify pins board beep generated signal system ready normal operation Should whistle continue sound after beep switch making contact somewhere open contacts found corrected whistle silences system now ready normal oper ation Whenever pin removed re placed short beep activated pro cessor checks see intermod triplet present whistle continues sound until offending pins re placed technically curious U 1 4 MHz CMOS Z80 microprocessor driven 4 MHz clock turn powered 4 MHz crystal oscillator cir cuit UlO-b buffered U10-a choice clock frequency arbi trary Microprocessor circuits frequently generate several harmonics clock fre quency since square wave 18th harmonic would therefore 720 MHz 19th 760 MHz either side band concerned Although high-impedance CMOS circuitry low current drain characteristically lends itself low radiation levels nev ertheless took precaution checking finished board spectrum ana lyzer No detectable signals could found beyond approximately six inches power-on reset circuitry consists Ull-b C3 R3 power ap plied C3 begins take charge re sulting low Ul 1-b-b presets flipflop causes Q* output drop re setting processor U 11-a also indu ces illegal condition simultaneous ac tivity both set clear states condition exists both Q Q* outputs reach high levels As C3 charge reaches approximately 2A V et condition cleared flip-flop al lowed operate normally next low-to-high transitions clock subsequent ones low D input clocked through caus ing Q* output rise reset thus removed processor program execution begins Simultaneously Ul 1-a released its illegal dual state flip-flop assumes clear state Ul 1-a drives bell output duration reset pulse Sounding bell point simple way subject battery fullload test since cells opera tional bell either wont sound will sound very weakly alerting opera tor problem exists program stored 27C16 CMOS EPROM U2 Since memory system CS* line can tied directly processor MRQ* output Since EPROM read-only unit OE enabled processor RD* U3 through U8 tristate input buffers enabled port address decoder U9 internal gates provided 74HC 138 used enable decoder IORQ* RD* processor true Since system requires six ports ad dress lines 0 through 2 decoded ports accessed program 5 through 0 output bell through Ul 1-a being device written allows processor WT* IORQ* lines ORd U 10-c derive clock flip-flop DO data input 1 data line turns bell 0 turns off bell set power-up Resistors Ri l-R58 simply pullup re sistors switches Since switches normally closed largest practical value chosen reduce current con sumption monitor mode Cl 1-C58 RF bypass capacitors allow long leads switches operating presence lowpower transmitters ca pacitors minimize energy being coupled switch leads energy might otherwise radiated atmo sphere Software switches read Continued page 175 92 Model Aviation input section occupies end board Look carefully photo will notice jumpers unused channels pad ia screwed plane wire will securely pressed between pad fuselage minimize wire failure point Help needed 89 Nats received letter Bob Dalton Wayne Foster requesting sistance during years Nats Richland WA year Nats manpower requirement CL Racing extensive Bob has asked anyone can provide timing modelprocessing assistance please drop him note 1455 South Peacehaven Rd Clemmons NC 27012 As always solicit comments photos share readers Whistle/Tierney Continued page 92 stored eight-bit bytes inter nal registers processor pur poses entire string bits can consid ered 48-bit word processor contin uously scans switches compares new input switch state previously stored its memory Any change switch state will stored 31M evaluation will begin bell set task begins processor applies mask containing possible triplets could occur bit pattern mask simplified terms oriented according bit position triplets mask recognize bit 1 part triplet method requires some time during evaluation process bit must first accomplish entire bit pattern shifted bit position mask reapplied process continued until 46 48 bits have shifted bit #1 position remaining two shifts performed since two bits cant constitute triplet no match found bell turned off scanning continues Complicated time-consum ing sounds execution process times duration beep heard pin removed replaced however match found bell re mains program returns switch scanning Since change state switch contact what triggers evalua tion process replacement of offending pins will result no-match eval uation turning bell off Construction Since full-size circuit board pattern approximately 86 41 beyond scope article publish etching drilling guide light fact have made arrangements local company provide partial kits completely assembled tested con trollers company actually stu dent coalition son mem ber will anything mow grass custom fabricating electronic cir cuit boards little help dad have built couple Eagle 63s pricing has established follows MUM EKE U BUUEEU SIG GLOW FUEL MANUFACTURED WITH THE PUREST FINEST QUALITY INGREDIENTS AVAILABLE * Superior Igniters Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINT QUART GALLON 0% Nitromethane$1075 5% Nitromethane$365$525$1275 10% Nitromethane$415$550$1475 15% Nitromethane$430$635$1675 25% Nitromethane$515$795$2195 35% Nitromethane$595$925$2695 SIG PREMIUM 4-STROKE FUEL 10% Nitromethane$1425 15% Nitromethane$1625 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPrices sobjoct change withoot notice See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO Montezuma IA 50171 2X photo-ready etching drilling guide $500 Custom-programmed EPROM$1250 Etched drilled printed circuit board plated-through holes$2500 Assembled tested controller board $10000 address SJB Custom Attn Jason Tierney 9788 Ralph Road Whitesville KY 42378 sure specify interested RC Pinboard Controller project bit costly earlier model hope its simplicity versatility can indeed write final chapter third-order intermod monitoring flying field Happy Flying Sea Dart/Gilgenbach Continued page 100 fan intake exhaust primarily concerned about maximizing static thrust taking off water Since top speed full-size Sea Dart 670 mph 1/9-scale model wouldnt have go over 100 mph give good scale effect Tom also recommended build model light possible achieve takeoff July 1989 175
Edition: Model Aviation - 1989/07
Page Numbers: 89, 90, 91, 92, 175
MY ARTICLE published March 1987 issue Model Aviation apparently generated lot interest automatic mon itoring 31M possibilities flying field received quite lot mail concern ing project Some people wrote asking additional information others say system worked liked Most mail lately however has request ing update new frequencies now available Keeping mind requests criticisms haywire ap proach used original version set out write final chapter onsite monitoring available spectrum Construction modular al lows easy customizing individual needs would also allow retrofitting ex isting boards new brain brain constructed printed cir cuit board easy building reliable perThe Final Chapter Whistle Blows Dont Fly frequency con trol board has mod ern electronics head off modeler-tomodeler interference problems Its up date authors 1987 system able handle new RC chan nels EM Dennis Tierney formance Because number new RC fre July 1989 89 board used authors flying field simplest implementations controller board presently set up handling just even-numbered channels adequate space addition odd-numbered channels required About author has employed communications industry past 15 years holds FCC license past eight years has has primarily involved digital telemetry de sign off-premise control applications major natural gas pipeline company interest model aviation actually sparked testing done commercial one-way controls now sand wiched between aircraft frequencies work turned play hes glad did LeTt me back side board shows method installation Tiexiollity CT inc ieaa aress Iligni MUIK o circuiiry Ofl inc cir cult board PC board homemade Professional boards much higher quality As can seen external circuitry minimal 90 Model Aviation quencies weve acquired possibility adding original design using diode OR gates soon vanished over 120 possible triplet combinations out today Granted since band now oc cupies nearly whole MHz some triplets would never cause problem Since aim however find definitive solution possible in-band combinations would included Also design criteria should include prospective channels just cur rently use new design has capa bility monitor 48 channels 11-58 should choose implement appar ent easiest way accomplish goal mi croprocessor microprocessor cir cuitry turned Out actually sim ple selected 4 BTI t 8V AMi Z80 because large number internal registers Since registers could used short-term data manipulation no RAM required 27C16 EPROM provided enough program mem ory CMOS input output buffers high-impedance low-pass filters RF re jection completed heart system power supply 500-mAh flight pack fully charged pack will provide about 40 hours power switches pin sensing made scrap sheet metal Since switches original board service local field nearly three ON v4 1 OFF Ji su 9 1D DELL currHfl annunciator UTI ln pack 41 jack July 1989 91 no ousiness ena OT circuit boara snowing tne microprocessor support components Note insulators installed mounting studs Plus side board minus other years now still causing prob lems applied aint broke dont fix principle Add on-off switch low-current annunciator system complete implementation system left rather open-ended couple reasons have privileged visit several flying fields traveling Ohio River Valley Mississippi River Delta busi ness fields visited frequency control sort another big dif ference some clubs choose have members place markers board flying others choose provide markers remove flying addition some clubs require AMA membership card posted use channel suppose aids re covery markers Clothespins seem preferred markers reasons actual layout can arrangement suits fancy long switch contact connected appropriate mon itor input RF bypassing allows extreme flexibility regard lead length layout choose use portion allowa ble frequencies ie even-numbered channels just use jumper re place associ ated capacitor leave out resis tor oddnumbered channels future should decide use frequen cies simply re move jumper install switch filter components choose put pins board instead remov ing substi tute input buf fers 74HC244 inverting buffers hav ing identical pinout 74HC240 Tie unused input buffers high use jumper place resistor 31M board following dis cussion assumes pins board will removed use Should opt place pins board opera tions will re versed power applied whistle turned short time end DC test processor tests verify pins board beep generated signal system ready normal operation Should whistle continue sound after beep switch making contact somewhere open contacts found corrected whistle silences system now ready normal oper ation Whenever pin removed re placed short beep activated pro cessor checks see intermod triplet present whistle continues sound until offending pins re placed technically curious U 1 4 MHz CMOS Z80 microprocessor driven 4 MHz clock turn powered 4 MHz crystal oscillator cir cuit UlO-b buffered U10-a choice clock frequency arbi trary Microprocessor circuits frequently generate several harmonics clock fre quency since square wave 18th harmonic would therefore 720 MHz 19th 760 MHz either side band concerned Although high-impedance CMOS circuitry low current drain characteristically lends itself low radiation levels nev ertheless took precaution checking finished board spectrum ana lyzer No detectable signals could found beyond approximately six inches power-on reset circuitry consists Ull-b C3 R3 power ap plied C3 begins take charge re sulting low Ul 1-b-b presets flipflop causes Q* output drop re setting processor U 11-a also indu ces illegal condition simultaneous ac tivity both set clear states condition exists both Q Q* outputs reach high levels As C3 charge reaches approximately 2A V et condition cleared flip-flop al lowed operate normally next low-to-high transitions clock subsequent ones low D input clocked through caus ing Q* output rise reset thus removed processor program execution begins Simultaneously Ul 1-a released its illegal dual state flip-flop assumes clear state Ul 1-a drives bell output duration reset pulse Sounding bell point simple way subject battery fullload test since cells opera tional bell either wont sound will sound very weakly alerting opera tor problem exists program stored 27C16 CMOS EPROM U2 Since memory system CS* line can tied directly processor MRQ* output Since EPROM read-only unit OE enabled processor RD* U3 through U8 tristate input buffers enabled port address decoder U9 internal gates provided 74HC 138 used enable decoder IORQ* RD* processor true Since system requires six ports ad dress lines 0 through 2 decoded ports accessed program 5 through 0 output bell through Ul 1-a being device written allows processor WT* IORQ* lines ORd U 10-c derive clock flip-flop DO data input 1 data line turns bell 0 turns off bell set power-up Resistors Ri l-R58 simply pullup re sistors switches Since switches normally closed largest practical value chosen reduce current con sumption monitor mode Cl 1-C58 RF bypass capacitors allow long leads switches operating presence lowpower transmitters ca pacitors minimize energy being coupled switch leads energy might otherwise radiated atmo sphere Software switches read Continued page 175 92 Model Aviation input section occupies end board Look carefully photo will notice jumpers unused channels pad ia screwed plane wire will securely pressed between pad fuselage minimize wire failure point Help needed 89 Nats received letter Bob Dalton Wayne Foster requesting sistance during years Nats Richland WA year Nats manpower requirement CL Racing extensive Bob has asked anyone can provide timing modelprocessing assistance please drop him note 1455 South Peacehaven Rd Clemmons NC 27012 As always solicit comments photos share readers Whistle/Tierney Continued page 92 stored eight-bit bytes inter nal registers processor pur poses entire string bits can consid ered 48-bit word processor contin uously scans switches compares new input switch state previously stored its memory Any change switch state will stored 31M evaluation will begin bell set task begins processor applies mask containing possible triplets could occur bit pattern mask simplified terms oriented according bit position triplets mask recognize bit 1 part triplet method requires some time during evaluation process bit must first accomplish entire bit pattern shifted bit position mask reapplied process continued until 46 48 bits have shifted bit #1 position remaining two shifts performed since two bits cant constitute triplet no match found bell turned off scanning continues Complicated time-consum ing sounds execution process times duration beep heard pin removed replaced however match found bell re mains program returns switch scanning Since change state switch contact what triggers evalua tion process replacement of offending pins will result no-match eval uation turning bell off Construction Since full-size circuit board pattern approximately 86 41 beyond scope article publish etching drilling guide light fact have made arrangements local company provide partial kits completely assembled tested con trollers company actually stu dent coalition son mem ber will anything mow grass custom fabricating electronic cir cuit boards little help dad have built couple Eagle 63s pricing has established follows MUM EKE U BUUEEU SIG GLOW FUEL MANUFACTURED WITH THE PUREST FINEST QUALITY INGREDIENTS AVAILABLE * Superior Igniters Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINT QUART GALLON 0% Nitromethane$1075 5% Nitromethane$365$525$1275 10% Nitromethane$415$550$1475 15% Nitromethane$430$635$1675 25% Nitromethane$515$795$2195 35% Nitromethane$595$925$2695 SIG PREMIUM 4-STROKE FUEL 10% Nitromethane$1425 15% Nitromethane$1625 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPrices sobjoct change withoot notice See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO Montezuma IA 50171 2X photo-ready etching drilling guide $500 Custom-programmed EPROM$1250 Etched drilled printed circuit board plated-through holes$2500 Assembled tested controller board $10000 address SJB Custom Attn Jason Tierney 9788 Ralph Road Whitesville KY 42378 sure specify interested RC Pinboard Controller project bit costly earlier model hope its simplicity versatility can indeed write final chapter third-order intermod monitoring flying field Happy Flying Sea Dart/Gilgenbach Continued page 100 fan intake exhaust primarily concerned about maximizing static thrust taking off water Since top speed full-size Sea Dart 670 mph 1/9-scale model wouldnt have go over 100 mph give good scale effect Tom also recommended build model light possible achieve takeoff July 1989 175
Edition: Model Aviation - 1989/07
Page Numbers: 89, 90, 91, 92, 175
MY ARTICLE published March 1987 issue Model Aviation apparently generated lot interest automatic mon itoring 31M possibilities flying field received quite lot mail concern ing project Some people wrote asking additional information others say system worked liked Most mail lately however has request ing update new frequencies now available Keeping mind requests criticisms haywire ap proach used original version set out write final chapter onsite monitoring available spectrum Construction modular al lows easy customizing individual needs would also allow retrofitting ex isting boards new brain brain constructed printed cir cuit board easy building reliable perThe Final Chapter Whistle Blows Dont Fly frequency con trol board has mod ern electronics head off modeler-tomodeler interference problems Its up date authors 1987 system able handle new RC chan nels EM Dennis Tierney formance Because number new RC fre July 1989 89 board used authors flying field simplest implementations controller board presently set up handling just even-numbered channels adequate space addition odd-numbered channels required About author has employed communications industry past 15 years holds FCC license past eight years has has primarily involved digital telemetry de sign off-premise control applications major natural gas pipeline company interest model aviation actually sparked testing done commercial one-way controls now sand wiched between aircraft frequencies work turned play hes glad did LeTt me back side board shows method installation Tiexiollity CT inc ieaa aress Iligni MUIK o circuiiry Ofl inc cir cult board PC board homemade Professional boards much higher quality As can seen external circuitry minimal 90 Model Aviation quencies weve acquired possibility adding original design using diode OR gates soon vanished over 120 possible triplet combinations out today Granted since band now oc cupies nearly whole MHz some triplets would never cause problem Since aim however find definitive solution possible in-band combinations would included Also design criteria should include prospective channels just cur rently use new design has capa bility monitor 48 channels 11-58 should choose implement appar ent easiest way accomplish goal mi croprocessor microprocessor cir cuitry turned Out actually sim ple selected 4 BTI t 8V AMi Z80 because large number internal registers Since registers could used short-term data manipulation no RAM required 27C16 EPROM provided enough program mem ory CMOS input output buffers high-impedance low-pass filters RF re jection completed heart system power supply 500-mAh flight pack fully charged pack will provide about 40 hours power switches pin sensing made scrap sheet metal Since switches original board service local field nearly three ON v4 1 OFF Ji su 9 1D DELL currHfl annunciator UTI ln pack 41 jack July 1989 91 no ousiness ena OT circuit boara snowing tne microprocessor support components Note insulators installed mounting studs Plus side board minus other years now still causing prob lems applied aint broke dont fix principle Add on-off switch low-current annunciator system complete implementation system left rather open-ended couple reasons have privileged visit several flying fields traveling Ohio River Valley Mississippi River Delta busi ness fields visited frequency control sort another big dif ference some clubs choose have members place markers board flying others choose provide markers remove flying addition some clubs require AMA membership card posted use channel suppose aids re covery markers Clothespins seem preferred markers reasons actual layout can arrangement suits fancy long switch contact connected appropriate mon itor input RF bypassing allows extreme flexibility regard lead length layout choose use portion allowa ble frequencies ie even-numbered channels just use jumper re place associ ated capacitor leave out resis tor oddnumbered channels future should decide use frequen cies simply re move jumper install switch filter components choose put pins board instead remov ing substi tute input buf fers 74HC244 inverting buffers hav ing identical pinout 74HC240 Tie unused input buffers high use jumper place resistor 31M board following dis cussion assumes pins board will removed use Should opt place pins board opera tions will re versed power applied whistle turned short time end DC test processor tests verify pins board beep generated signal system ready normal operation Should whistle continue sound after beep switch making contact somewhere open contacts found corrected whistle silences system now ready normal oper ation Whenever pin removed re placed short beep activated pro cessor checks see intermod triplet present whistle continues sound until offending pins re placed technically curious U 1 4 MHz CMOS Z80 microprocessor driven 4 MHz clock turn powered 4 MHz crystal oscillator cir cuit UlO-b buffered U10-a choice clock frequency arbi trary Microprocessor circuits frequently generate several harmonics clock fre quency since square wave 18th harmonic would therefore 720 MHz 19th 760 MHz either side band concerned Although high-impedance CMOS circuitry low current drain characteristically lends itself low radiation levels nev ertheless took precaution checking finished board spectrum ana lyzer No detectable signals could found beyond approximately six inches power-on reset circuitry consists Ull-b C3 R3 power ap plied C3 begins take charge re sulting low Ul 1-b-b presets flipflop causes Q* output drop re setting processor U 11-a also indu ces illegal condition simultaneous ac tivity both set clear states condition exists both Q Q* outputs reach high levels As C3 charge reaches approximately 2A V et condition cleared flip-flop al lowed operate normally next low-to-high transitions clock subsequent ones low D input clocked through caus ing Q* output rise reset thus removed processor program execution begins Simultaneously Ul 1-a released its illegal dual state flip-flop assumes clear state Ul 1-a drives bell output duration reset pulse Sounding bell point simple way subject battery fullload test since cells opera tional bell either wont sound will sound very weakly alerting opera tor problem exists program stored 27C16 CMOS EPROM U2 Since memory system CS* line can tied directly processor MRQ* output Since EPROM read-only unit OE enabled processor RD* U3 through U8 tristate input buffers enabled port address decoder U9 internal gates provided 74HC 138 used enable decoder IORQ* RD* processor true Since system requires six ports ad dress lines 0 through 2 decoded ports accessed program 5 through 0 output bell through Ul 1-a being device written allows processor WT* IORQ* lines ORd U 10-c derive clock flip-flop DO data input 1 data line turns bell 0 turns off bell set power-up Resistors Ri l-R58 simply pullup re sistors switches Since switches normally closed largest practical value chosen reduce current con sumption monitor mode Cl 1-C58 RF bypass capacitors allow long leads switches operating presence lowpower transmitters ca pacitors minimize energy being coupled switch leads energy might otherwise radiated atmo sphere Software switches read Continued page 175 92 Model Aviation input section occupies end board Look carefully photo will notice jumpers unused channels pad ia screwed plane wire will securely pressed between pad fuselage minimize wire failure point Help needed 89 Nats received letter Bob Dalton Wayne Foster requesting sistance during years Nats Richland WA year Nats manpower requirement CL Racing extensive Bob has asked anyone can provide timing modelprocessing assistance please drop him note 1455 South Peacehaven Rd Clemmons NC 27012 As always solicit comments photos share readers Whistle/Tierney Continued page 92 stored eight-bit bytes inter nal registers processor pur poses entire string bits can consid ered 48-bit word processor contin uously scans switches compares new input switch state previously stored its memory Any change switch state will stored 31M evaluation will begin bell set task begins processor applies mask containing possible triplets could occur bit pattern mask simplified terms oriented according bit position triplets mask recognize bit 1 part triplet method requires some time during evaluation process bit must first accomplish entire bit pattern shifted bit position mask reapplied process continued until 46 48 bits have shifted bit #1 position remaining two shifts performed since two bits cant constitute triplet no match found bell turned off scanning continues Complicated time-consum ing sounds execution process times duration beep heard pin removed replaced however match found bell re mains program returns switch scanning Since change state switch contact what triggers evalua tion process replacement of offending pins will result no-match eval uation turning bell off Construction Since full-size circuit board pattern approximately 86 41 beyond scope article publish etching drilling guide light fact have made arrangements local company provide partial kits completely assembled tested con trollers company actually stu dent coalition son mem ber will anything mow grass custom fabricating electronic cir cuit boards little help dad have built couple Eagle 63s pricing has established follows MUM EKE U BUUEEU SIG GLOW FUEL MANUFACTURED WITH THE PUREST FINEST QUALITY INGREDIENTS AVAILABLE * Superior Igniters Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed FREE SHIPPING ON ORDERS OVER $1500 SIG CHAMPION 2-STROKE FUEL PINT QUART GALLON 0% Nitromethane$1075 5% Nitromethane$365$525$1275 10% Nitromethane$415$550$1475 15% Nitromethane$430$635$1675 25% Nitromethane$515$795$2195 35% Nitromethane$595$925$2695 SIG PREMIUM 4-STROKE FUEL 10% Nitromethane$1425 15% Nitromethane$1625 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPrices sobjoct change withoot notice See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 MANUFACTURING CO Montezuma IA 50171 2X photo-ready etching drilling guide $500 Custom-programmed EPROM$1250 Etched drilled printed circuit board plated-through holes$2500 Assembled tested controller board $10000 address SJB Custom Attn Jason Tierney 9788 Ralph Road Whitesville KY 42378 sure specify interested RC Pinboard Controller project bit costly earlier model hope its simplicity versatility can indeed write final chapter third-order intermod monitoring flying field Happy Flying Sea Dart/Gilgenbach Continued page 100 fan intake exhaust primarily concerned about maximizing static thrust taking off water Since top speed full-size Sea Dart 670 mph 1/9-scale model wouldnt have go over 100 mph give good scale effect Tom also recommended build model light possible achieve takeoff July 1989 175