George M Myers Radio Thchnique 70 FrothItch Farm Rd Hlcksville NY 11801 An adjacent channel may either 40 kHz away distance between present evennumbered RC channels 20 kHz away will situation 1991 oddnumbered channels will put use use factor call M200 Factor designate times ffirther away YOUR transmitter MAY receiver compared far away INTERFERING transmitter IS re ceiver before interference occurs can find information very useful during takeoffs landings other fliers transmitters operating may also standing flight lineand model may pass closer to value M200 200 means terfering transmitters antenna could laid right receivers antenna having effect following table treat M200 being equal 200 purposes calculating averages Also above means interfer ing transmitter channel higher num ber control transmitter below means interfering transmitter lowernumbered channel M200 Adjacent-Channel Test Advantage over other transmitter Averaging above below tests tnterfering M200 Factors Transmitter TypeII DataHigh Low Avg Gold-sticker FM 40 kHz9200 212 1023 some test results time Dynamic Trio Gold-sticker AM 40 kHz 8 2001- 164 654 Gold-sticker FM 20 kHz9200 133 174 Myers/AberlelSteiner have subjected repre-Gold-sticker AM 20 kHzI107107107 sentative number new radios adjacent-Silver-sticker AM 40 kHz949098156 channel simulated flight line interference con-Silver-sticker AM 20 kHz914446 63 ditions Note Poiks Powerinax Merlin scored 200 40 kHz 137 20 kHz 157 23-channel separation WHATS AHEAD part two discus sion began last month Bob Aberle George Steiner have seen tested various ways some DC dual-conversion Rx including new Airtronics receivers Futaba 1024 PCM Polks Challenger 720 Worlds Expert Ace RICs Model 91 old Kraft KPR-8FD show some interesting characteristics 1 Adjacent-channel interference insignifi cant new dual-conversion DC receivers Gold-sticker transmitters 20 kHz channel sepa ration 1991 situation have less effect new receivers Silver-sticker transmit ters 40 kHz separation old receivers 1983-1987 situation 2 All new DC receivers ignore 21M sig nificantly better 31M resistance old SC4SSs Kraft KPR-8FD 5C455 single-conversion receiver 455 kHz local oscillator frequency Since -8FD best DC its time since Rxalonecost 1983 dollars com plete new World Engines system costs 1988 dollars relationship should give cause think about capabilities receiver now using Last month told going 40 Model Aviation After year time new channel flags Myers still sees transmitters Several manufacturers sell good ones Need something hold until can afford something permanent Make channel flag using 3 x 5 notepad Magic Marker some red yellow ribbon plus glue staples hold together ABSTRACT Predicted 1991 operating condi tionsPatI 2 Dual-conversion receivers fre quency management plans answer questions Narrow bandlwideband function equip ment what channel its have narrow-band set upper chan nels RC38-60 youre just better off other fliers channels took George less one-half hour equip seven transmitters up-to-date flags Cmon guys Anybody can afford Myers cheap flag Use Christmas ribbon nec essary should plenty half-price sales right about now Flight line simulation test put test transmitters butt-to-butt have 200 ft away control transmitter test receiver/plane goes between Nobody flies way promote butt-to-butt test because easy perform doesnt require special tools something can yourself have to measure 200ft baseline set up test condition move test receiver/plane toward butt-to-butt interfer ers measure record distance tween receiver/plane interfering trans mitters evidence interference first oc curs calculate M200 factor sub tracting last measurement 200 di vide result same distance important point test will clearly separate good/bad performers still box have good system can get receiver within 50 ft butt-to-butt pair before losing control would M200 xample two transmitters 15 ft 40 kHz apart produced interference 40 feet M200 tual test same two Tx buttto-butt setup produced interference 51 ft M200 light line eight real Goldsticker transmitters four AM four FM 15ft 40 kHz intervals produced interference 53 feet M200 utt-to-butt arrangement produces intermodulation signals exactly same interval 20 40 KHz separates two test transmit ters See figures Radio Technique column April 1987 issue page 24 re ceiver under test reacts being attacked about eight widely separated operating trans mitters Thats call Flight Line Sim ulation M200 Flight Line Simulation FLS Advantage over groups transmitters InterferingM200 Factors Transmitter PairN Data High Low Avg Gid FM/Old AM @40 kHz8855375 Gid FMIGld FM @40 kliz8902241 Old FM/Old FM@2OkHz8701638 Old FM/Gld AM@2OkHz8672541 Analysis statistics something fascinating about science gets such whole some returns conjecture out trifling invest ment fact Mark Twain Life Missis sippi Ch XVII Lets pretend its already 1991 Nats flying Pattern FM transmitter RC5 1 Sites different events separated 1000 ft Someone using RC49 FM trans mitter 40 kHz interval flying Scale Helicopter flying Pattern have good DC receiver might see interference plane got close transmitter 1000/212 t worst case data might see interference best case data can live RC5O 20 kHz interval danger zone would 0 94 ft essentially same Assuming have good receiver use good sense flying have no problem Likewise under normal circumstances Hel icopter would never wander far enough transmitter aware transmitter operating Therefore no ADJACENTCHANNEL interference problems using Gold-toGold 20 kHz 40 kHz interval 1000 ft separationparticularly dont fly directiy over another gets interesting Helicopter launched controlled old Silversticker RC5O AM transmitter remember its now being used 20 kHz interval case Continued page 42 May 1989 41 PERK/N AVIONICS ANNOUNCES Its newest product development scheduled availability late 1989 product serious RC Modeler would like simulate real dogfight engagement no damage model aircraft visual indicator winner interest you need find out about. MISSILE LOCK high tech non destructive model electronic weapon system outline Missile Lock capabilities Introductory Discount Certificate send $300 address MISSILE LOCK Perkin Avionics PO Box 396 Ellenwood GA 30049 145-CO VER Now fliers over world have neat inexpensive functional way protect R/C transmitters dirt dust rain Custom printed club logo Constructed durable canvas lifelong Velcro closure Available red blue green yellow orange black Colors can mixed size fits Send check money order KD GRAPHICS 3315 13th Avenue Columbus Georgia 31904 404/323-2787 9am-Spm EST DERS SHIPPED AY RECEIVED WARBIRD VIDEOSHSORBnA UR 23RD YEAR ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 SPE6IAL IWTRODLJ6IORY OFFER ALL 6 VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P61 Black Widow A-26 Invader NF 1454 ProgramslOG Mm Only $3995 WARBIRD CHECKOUT VOL 111 Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li. ] Day Night Money Order Check Credit Card Mastercard Visa American Express Shipping Paid Continental US-Foreign add $500 fornia residents add 6 1/2% tax NP VIDEO LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 might see glitch plane comes 1000/46 ft transmitter worst case 1000/144 t best case Its lit tle worse could live because cDs would set up flight patterns prevent actually getting close him Good re ceivers would protect both Now lets say he/she gets RC5O AM trans mitter narrow-banded Gold-stickered Better youre satisfied what he/she still tries get 5C455 OWBAM re ceiver interference might seen 1000/30 ft He/she WONT able live Pattern will com fortable Helicopter machine kept close 21M 23rd channel doesnt get first Prediction #2 Prediction #1 last months column Adjacent-channel interference wont problem people using Gold stickered systems good DC receivers whether 20 kHz 40 kHz raster Lets say person AM RC5O just talked about above pops Gold-sticker FM RC5O Tx module stands beside guy Gold-sticker FM RC49 Tx 20 kHz inter val Both stand another Pattern flight station 1000 ft away might overfly ing estimate could get 1000/16 ft have bad receiver 1000/9 ft have good receiver ought enough incentive get good receiver Actually potential interference isnt severe because two will standing 30 ft apart sideby-side holding transmitters butt-to-butt What learned FLS testing new M200 FLS numbers better old good enough eliminate need flight line frequency management 1991 still have use head Prediction #3 will still need FLIGHT LINE DISCIPLINE frequency pins flight stations fre quency management plans transmitter im pounds etc provide safe operating conditions 1991 particularly large contests sev eral events taking place same time same site People keep asking flight station plan 1991 know wrote flight station computer program hack wasnt good enough avoided adjacent-channel im age third-order interferences threw out channels People really wanted plan use OWBAM SC455s 50 channels will fly few planes time rural areas free commercial interfer ence have right use OWBAMs even-numbered channels using Owen Blacks Pacific Plan long able plan accommodates OWBAMS even-numbered channels has proven good plan might think can work up scheme protects wideband receivers simply pro hibiting simultaneous operation two trans mitters 23 channels apart single odd-channel RC Tx can generate 2IM interfer ence common carrier Tx operating frequency 22 RC channel numbers plus 10 kHz away like RC53 72400 old Orange/White 10-year-old receiver trying protect wideband enough af fected 2IM 23-channel problem cant fly odd-channel transmitters So 42 Model Aviation 3 dozen $400 ea 4 dozen $375 ea 5 dozen $360 ea 6 dozen $355 ea Add $400 shipping per order Please send good black white art reproduction Please specify quantity Trans-Cover colors ink color ordering Limit ink color per order WARBIRD CHECKOUT VOL IV Flying P-47 3 paris Flying T-6 3 parts NF 1366 ProgramshO MIn Only $3995 WARBIRD CHECKOUT VOL V Flying B-29 Pre-Flight BI7E Pre-Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 MODERN JET FIG Flying FIA18 Hornet Eagle F-16 and Thunderbirc hi 1LR B. mmeAfl Mm Anh youd left prohibiting odd-numbered RC channels locally praying no acci dents happen can see reasonable plans might generated current dual-conversion narrow-band SC455 receivers bccause free adjacent-channel image thirdorder problems practical basis WHEN USED WITH APPROPRIATE NARROWBAND TRANSMITTERS dont see plan can safely put old wideband SC4S5s 50 channels PARTICULARLY IF USED WITH WIDEBAND TRANSMITTERS see such plan has consider both transmitters receivers mixed up wide- narrowband Canadians lacking ready supply narrow-band equipment went system blocking out adjacent channels according oc cupied bandwidths accomplish purpose works USA odd-channel Tx complicate pic ture wideband SC455s channels already have difficulty large groups met ropolitan areas subject interfer ence adjacent-channel commercial radio Sepulveda Basin LAsee Dave Pelts Dis trict X Report AMA News January 1989 page 132 interference problems cannot controlled adopting Canadian scheme Maybe theres nothing worry about dont have use scanner youre acting like fisherman drowning worms havent clue whats out danger hobby whole clinging obsolete concepts AMA knew obsolete equipment would have aban doned 1991and told articles hobby industry improved products vendor now offers 1991 radio whether has certified AMA Guidelines Now insist channels attempt preserve 10-year-old equipment dealers wont stock new equipment odd channels FCC will notice away will go odd channels some other ser vice will leave Second maybe really should first someone using outdated equipment has serious accident loses lawsuit reason resulting legal precedent might put end RC hobby way law works must EVERYTHING YOU CAN avoid juring others get hurt anyway have pay AMA went self-insurance because premi ums high Now doing best can cling outmoded equip ment Can AMA afford attitude Con sider California parks playgrounds have closed because municipalities cant af ford premiums liability insurance would have have keep open much would individual have pay liability insurance continue RC flying AMA could insure sincerest appreciation George P Steiner pushed writing two-part essay George Robert F Aberle other friends criticized massaged early drafts until satisfied text saying correct things see defect what has written above have better way approach problems 1991 PLEASE DONT KEEP IT SECRET Write note Spend quarter Leader Small Airfoil Technology MASTER AIRSCREW four series choose Master Airscrew offers full line propellers flying application made tough glass-filled nylon superior strength durability GIF SERIES Designed sport flyer 0/F Series available 28 popular sizes 5-11 diameters K SERIES K Series designed 4 2 stroke applications Wide undercambered blades provide greater thrust slower turning 4 strokes 8 sIzes including new 12 x 8 15 x 10 tips painted safety ANTIQUE SERIES performance series features scimitar shape swept back tips plenty undercamber s suitable application Sizes 12 x 6 13 x 6 14 x 716 x 7 new 10 x 5 11 x 6 gold glass-filled nylon L 12 x 8 15 x 12 folding propellers geared systems 8 selffeathering adjustable pitch prop 05 direct drive give improved thrust glide less drag fixed blade props See Hobby Dealer tor MASTER AIRSCREW propellers accessories Windsor Propeller Company 384 Tesconi Court Santa Rose CA 95401 source lightweight materials P0 Box 16621 Dept M Irvine CA 92714 714250-1107 May 1989 43 r CARBON FIBER LAMINATES Aerospace Composite Products offers var ety r g d carbon f ber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$7O0 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add $300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order to
Edition: Model Aviation - 1989/05
Page Numbers: 40, 41, 42, 43
George M Myers Radio Thchnique 70 FrothItch Farm Rd Hlcksville NY 11801 An adjacent channel may either 40 kHz away distance between present evennumbered RC channels 20 kHz away will situation 1991 oddnumbered channels will put use use factor call M200 Factor designate times ffirther away YOUR transmitter MAY receiver compared far away INTERFERING transmitter IS re ceiver before interference occurs can find information very useful during takeoffs landings other fliers transmitters operating may also standing flight lineand model may pass closer to value M200 200 means terfering transmitters antenna could laid right receivers antenna having effect following table treat M200 being equal 200 purposes calculating averages Also above means interfer ing transmitter channel higher num ber control transmitter below means interfering transmitter lowernumbered channel M200 Adjacent-Channel Test Advantage over other transmitter Averaging above below tests tnterfering M200 Factors Transmitter TypeII DataHigh Low Avg Gold-sticker FM 40 kHz9200 212 1023 some test results time Dynamic Trio Gold-sticker AM 40 kHz 8 2001- 164 654 Gold-sticker FM 20 kHz9200 133 174 Myers/AberlelSteiner have subjected repre-Gold-sticker AM 20 kHzI107107107 sentative number new radios adjacent-Silver-sticker AM 40 kHz949098156 channel simulated flight line interference con-Silver-sticker AM 20 kHz914446 63 ditions Note Poiks Powerinax Merlin scored 200 40 kHz 137 20 kHz 157 23-channel separation WHATS AHEAD part two discus sion began last month Bob Aberle George Steiner have seen tested various ways some DC dual-conversion Rx including new Airtronics receivers Futaba 1024 PCM Polks Challenger 720 Worlds Expert Ace RICs Model 91 old Kraft KPR-8FD show some interesting characteristics 1 Adjacent-channel interference insignifi cant new dual-conversion DC receivers Gold-sticker transmitters 20 kHz channel sepa ration 1991 situation have less effect new receivers Silver-sticker transmit ters 40 kHz separation old receivers 1983-1987 situation 2 All new DC receivers ignore 21M sig nificantly better 31M resistance old SC4SSs Kraft KPR-8FD 5C455 single-conversion receiver 455 kHz local oscillator frequency Since -8FD best DC its time since Rxalonecost 1983 dollars com plete new World Engines system costs 1988 dollars relationship should give cause think about capabilities receiver now using Last month told going 40 Model Aviation After year time new channel flags Myers still sees transmitters Several manufacturers sell good ones Need something hold until can afford something permanent Make channel flag using 3 x 5 notepad Magic Marker some red yellow ribbon plus glue staples hold together ABSTRACT Predicted 1991 operating condi tionsPatI 2 Dual-conversion receivers fre quency management plans answer questions Narrow bandlwideband function equip ment what channel its have narrow-band set upper chan nels RC38-60 youre just better off other fliers channels took George less one-half hour equip seven transmitters up-to-date flags Cmon guys Anybody can afford Myers cheap flag Use Christmas ribbon nec essary should plenty half-price sales right about now Flight line simulation test put test transmitters butt-to-butt have 200 ft away control transmitter test receiver/plane goes between Nobody flies way promote butt-to-butt test because easy perform doesnt require special tools something can yourself have to measure 200ft baseline set up test condition move test receiver/plane toward butt-to-butt interfer ers measure record distance tween receiver/plane interfering trans mitters evidence interference first oc curs calculate M200 factor sub tracting last measurement 200 di vide result same distance important point test will clearly separate good/bad performers still box have good system can get receiver within 50 ft butt-to-butt pair before losing control would M200 xample two transmitters 15 ft 40 kHz apart produced interference 40 feet M200 tual test same two Tx buttto-butt setup produced interference 51 ft M200 light line eight real Goldsticker transmitters four AM four FM 15ft 40 kHz intervals produced interference 53 feet M200 utt-to-butt arrangement produces intermodulation signals exactly same interval 20 40 KHz separates two test transmit ters See figures Radio Technique column April 1987 issue page 24 re ceiver under test reacts being attacked about eight widely separated operating trans mitters Thats call Flight Line Sim ulation M200 Flight Line Simulation FLS Advantage over groups transmitters InterferingM200 Factors Transmitter PairN Data High Low Avg Gid FM/Old AM @40 kHz8855375 Gid FMIGld FM @40 kliz8902241 Old FM/Old FM@2OkHz8701638 Old FM/Gld AM@2OkHz8672541 Analysis statistics something fascinating about science gets such whole some returns conjecture out trifling invest ment fact Mark Twain Life Missis sippi Ch XVII Lets pretend its already 1991 Nats flying Pattern FM transmitter RC5 1 Sites different events separated 1000 ft Someone using RC49 FM trans mitter 40 kHz interval flying Scale Helicopter flying Pattern have good DC receiver might see interference plane got close transmitter 1000/212 t worst case data might see interference best case data can live RC5O 20 kHz interval danger zone would 0 94 ft essentially same Assuming have good receiver use good sense flying have no problem Likewise under normal circumstances Hel icopter would never wander far enough transmitter aware transmitter operating Therefore no ADJACENTCHANNEL interference problems using Gold-toGold 20 kHz 40 kHz interval 1000 ft separationparticularly dont fly directiy over another gets interesting Helicopter launched controlled old Silversticker RC5O AM transmitter remember its now being used 20 kHz interval case Continued page 42 May 1989 41 PERK/N AVIONICS ANNOUNCES Its newest product development scheduled availability late 1989 product serious RC Modeler would like simulate real dogfight engagement no damage model aircraft visual indicator winner interest you need find out about. MISSILE LOCK high tech non destructive model electronic weapon system outline Missile Lock capabilities Introductory Discount Certificate send $300 address MISSILE LOCK Perkin Avionics PO Box 396 Ellenwood GA 30049 145-CO VER Now fliers over world have neat inexpensive functional way protect R/C transmitters dirt dust rain Custom printed club logo Constructed durable canvas lifelong Velcro closure Available red blue green yellow orange black Colors can mixed size fits Send check money order KD GRAPHICS 3315 13th Avenue Columbus Georgia 31904 404/323-2787 9am-Spm EST DERS SHIPPED AY RECEIVED WARBIRD VIDEOSHSORBnA UR 23RD YEAR ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 SPE6IAL IWTRODLJ6IORY OFFER ALL 6 VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P61 Black Widow A-26 Invader NF 1454 ProgramslOG Mm Only $3995 WARBIRD CHECKOUT VOL 111 Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li. ] Day Night Money Order Check Credit Card Mastercard Visa American Express Shipping Paid Continental US-Foreign add $500 fornia residents add 6 1/2% tax NP VIDEO LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 might see glitch plane comes 1000/46 ft transmitter worst case 1000/144 t best case Its lit tle worse could live because cDs would set up flight patterns prevent actually getting close him Good re ceivers would protect both Now lets say he/she gets RC5O AM trans mitter narrow-banded Gold-stickered Better youre satisfied what he/she still tries get 5C455 OWBAM re ceiver interference might seen 1000/30 ft He/she WONT able live Pattern will com fortable Helicopter machine kept close 21M 23rd channel doesnt get first Prediction #2 Prediction #1 last months column Adjacent-channel interference wont problem people using Gold stickered systems good DC receivers whether 20 kHz 40 kHz raster Lets say person AM RC5O just talked about above pops Gold-sticker FM RC5O Tx module stands beside guy Gold-sticker FM RC49 Tx 20 kHz inter val Both stand another Pattern flight station 1000 ft away might overfly ing estimate could get 1000/16 ft have bad receiver 1000/9 ft have good receiver ought enough incentive get good receiver Actually potential interference isnt severe because two will standing 30 ft apart sideby-side holding transmitters butt-to-butt What learned FLS testing new M200 FLS numbers better old good enough eliminate need flight line frequency management 1991 still have use head Prediction #3 will still need FLIGHT LINE DISCIPLINE frequency pins flight stations fre quency management plans transmitter im pounds etc provide safe operating conditions 1991 particularly large contests sev eral events taking place same time same site People keep asking flight station plan 1991 know wrote flight station computer program hack wasnt good enough avoided adjacent-channel im age third-order interferences threw out channels People really wanted plan use OWBAM SC455s 50 channels will fly few planes time rural areas free commercial interfer ence have right use OWBAMs even-numbered channels using Owen Blacks Pacific Plan long able plan accommodates OWBAMS even-numbered channels has proven good plan might think can work up scheme protects wideband receivers simply pro hibiting simultaneous operation two trans mitters 23 channels apart single odd-channel RC Tx can generate 2IM interfer ence common carrier Tx operating frequency 22 RC channel numbers plus 10 kHz away like RC53 72400 old Orange/White 10-year-old receiver trying protect wideband enough af fected 2IM 23-channel problem cant fly odd-channel transmitters So 42 Model Aviation 3 dozen $400 ea 4 dozen $375 ea 5 dozen $360 ea 6 dozen $355 ea Add $400 shipping per order Please send good black white art reproduction Please specify quantity Trans-Cover colors ink color ordering Limit ink color per order WARBIRD CHECKOUT VOL IV Flying P-47 3 paris Flying T-6 3 parts NF 1366 ProgramshO MIn Only $3995 WARBIRD CHECKOUT VOL V Flying B-29 Pre-Flight BI7E Pre-Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 MODERN JET FIG Flying FIA18 Hornet Eagle F-16 and Thunderbirc hi 1LR B. mmeAfl Mm Anh youd left prohibiting odd-numbered RC channels locally praying no acci dents happen can see reasonable plans might generated current dual-conversion narrow-band SC455 receivers bccause free adjacent-channel image thirdorder problems practical basis WHEN USED WITH APPROPRIATE NARROWBAND TRANSMITTERS dont see plan can safely put old wideband SC4S5s 50 channels PARTICULARLY IF USED WITH WIDEBAND TRANSMITTERS see such plan has consider both transmitters receivers mixed up wide- narrowband Canadians lacking ready supply narrow-band equipment went system blocking out adjacent channels according oc cupied bandwidths accomplish purpose works USA odd-channel Tx complicate pic ture wideband SC455s channels already have difficulty large groups met ropolitan areas subject interfer ence adjacent-channel commercial radio Sepulveda Basin LAsee Dave Pelts Dis trict X Report AMA News January 1989 page 132 interference problems cannot controlled adopting Canadian scheme Maybe theres nothing worry about dont have use scanner youre acting like fisherman drowning worms havent clue whats out danger hobby whole clinging obsolete concepts AMA knew obsolete equipment would have aban doned 1991and told articles hobby industry improved products vendor now offers 1991 radio whether has certified AMA Guidelines Now insist channels attempt preserve 10-year-old equipment dealers wont stock new equipment odd channels FCC will notice away will go odd channels some other ser vice will leave Second maybe really should first someone using outdated equipment has serious accident loses lawsuit reason resulting legal precedent might put end RC hobby way law works must EVERYTHING YOU CAN avoid juring others get hurt anyway have pay AMA went self-insurance because premi ums high Now doing best can cling outmoded equip ment Can AMA afford attitude Con sider California parks playgrounds have closed because municipalities cant af ford premiums liability insurance would have have keep open much would individual have pay liability insurance continue RC flying AMA could insure sincerest appreciation George P Steiner pushed writing two-part essay George Robert F Aberle other friends criticized massaged early drafts until satisfied text saying correct things see defect what has written above have better way approach problems 1991 PLEASE DONT KEEP IT SECRET Write note Spend quarter Leader Small Airfoil Technology MASTER AIRSCREW four series choose Master Airscrew offers full line propellers flying application made tough glass-filled nylon superior strength durability GIF SERIES Designed sport flyer 0/F Series available 28 popular sizes 5-11 diameters K SERIES K Series designed 4 2 stroke applications Wide undercambered blades provide greater thrust slower turning 4 strokes 8 sIzes including new 12 x 8 15 x 10 tips painted safety ANTIQUE SERIES performance series features scimitar shape swept back tips plenty undercamber s suitable application Sizes 12 x 6 13 x 6 14 x 716 x 7 new 10 x 5 11 x 6 gold glass-filled nylon L 12 x 8 15 x 12 folding propellers geared systems 8 selffeathering adjustable pitch prop 05 direct drive give improved thrust glide less drag fixed blade props See Hobby Dealer tor MASTER AIRSCREW propellers accessories Windsor Propeller Company 384 Tesconi Court Santa Rose CA 95401 source lightweight materials P0 Box 16621 Dept M Irvine CA 92714 714250-1107 May 1989 43 r CARBON FIBER LAMINATES Aerospace Composite Products offers var ety r g d carbon f ber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$7O0 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add $300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order to
Edition: Model Aviation - 1989/05
Page Numbers: 40, 41, 42, 43
George M Myers Radio Thchnique 70 FrothItch Farm Rd Hlcksville NY 11801 An adjacent channel may either 40 kHz away distance between present evennumbered RC channels 20 kHz away will situation 1991 oddnumbered channels will put use use factor call M200 Factor designate times ffirther away YOUR transmitter MAY receiver compared far away INTERFERING transmitter IS re ceiver before interference occurs can find information very useful during takeoffs landings other fliers transmitters operating may also standing flight lineand model may pass closer to value M200 200 means terfering transmitters antenna could laid right receivers antenna having effect following table treat M200 being equal 200 purposes calculating averages Also above means interfer ing transmitter channel higher num ber control transmitter below means interfering transmitter lowernumbered channel M200 Adjacent-Channel Test Advantage over other transmitter Averaging above below tests tnterfering M200 Factors Transmitter TypeII DataHigh Low Avg Gold-sticker FM 40 kHz9200 212 1023 some test results time Dynamic Trio Gold-sticker AM 40 kHz 8 2001- 164 654 Gold-sticker FM 20 kHz9200 133 174 Myers/AberlelSteiner have subjected repre-Gold-sticker AM 20 kHzI107107107 sentative number new radios adjacent-Silver-sticker AM 40 kHz949098156 channel simulated flight line interference con-Silver-sticker AM 20 kHz914446 63 ditions Note Poiks Powerinax Merlin scored 200 40 kHz 137 20 kHz 157 23-channel separation WHATS AHEAD part two discus sion began last month Bob Aberle George Steiner have seen tested various ways some DC dual-conversion Rx including new Airtronics receivers Futaba 1024 PCM Polks Challenger 720 Worlds Expert Ace RICs Model 91 old Kraft KPR-8FD show some interesting characteristics 1 Adjacent-channel interference insignifi cant new dual-conversion DC receivers Gold-sticker transmitters 20 kHz channel sepa ration 1991 situation have less effect new receivers Silver-sticker transmit ters 40 kHz separation old receivers 1983-1987 situation 2 All new DC receivers ignore 21M sig nificantly better 31M resistance old SC4SSs Kraft KPR-8FD 5C455 single-conversion receiver 455 kHz local oscillator frequency Since -8FD best DC its time since Rxalonecost 1983 dollars com plete new World Engines system costs 1988 dollars relationship should give cause think about capabilities receiver now using Last month told going 40 Model Aviation After year time new channel flags Myers still sees transmitters Several manufacturers sell good ones Need something hold until can afford something permanent Make channel flag using 3 x 5 notepad Magic Marker some red yellow ribbon plus glue staples hold together ABSTRACT Predicted 1991 operating condi tionsPatI 2 Dual-conversion receivers fre quency management plans answer questions Narrow bandlwideband function equip ment what channel its have narrow-band set upper chan nels RC38-60 youre just better off other fliers channels took George less one-half hour equip seven transmitters up-to-date flags Cmon guys Anybody can afford Myers cheap flag Use Christmas ribbon nec essary should plenty half-price sales right about now Flight line simulation test put test transmitters butt-to-butt have 200 ft away control transmitter test receiver/plane goes between Nobody flies way promote butt-to-butt test because easy perform doesnt require special tools something can yourself have to measure 200ft baseline set up test condition move test receiver/plane toward butt-to-butt interfer ers measure record distance tween receiver/plane interfering trans mitters evidence interference first oc curs calculate M200 factor sub tracting last measurement 200 di vide result same distance important point test will clearly separate good/bad performers still box have good system can get receiver within 50 ft butt-to-butt pair before losing control would M200 xample two transmitters 15 ft 40 kHz apart produced interference 40 feet M200 tual test same two Tx buttto-butt setup produced interference 51 ft M200 light line eight real Goldsticker transmitters four AM four FM 15ft 40 kHz intervals produced interference 53 feet M200 utt-to-butt arrangement produces intermodulation signals exactly same interval 20 40 KHz separates two test transmit ters See figures Radio Technique column April 1987 issue page 24 re ceiver under test reacts being attacked about eight widely separated operating trans mitters Thats call Flight Line Sim ulation M200 Flight Line Simulation FLS Advantage over groups transmitters InterferingM200 Factors Transmitter PairN Data High Low Avg Gid FM/Old AM @40 kHz8855375 Gid FMIGld FM @40 kliz8902241 Old FM/Old FM@2OkHz8701638 Old FM/Gld AM@2OkHz8672541 Analysis statistics something fascinating about science gets such whole some returns conjecture out trifling invest ment fact Mark Twain Life Missis sippi Ch XVII Lets pretend its already 1991 Nats flying Pattern FM transmitter RC5 1 Sites different events separated 1000 ft Someone using RC49 FM trans mitter 40 kHz interval flying Scale Helicopter flying Pattern have good DC receiver might see interference plane got close transmitter 1000/212 t worst case data might see interference best case data can live RC5O 20 kHz interval danger zone would 0 94 ft essentially same Assuming have good receiver use good sense flying have no problem Likewise under normal circumstances Hel icopter would never wander far enough transmitter aware transmitter operating Therefore no ADJACENTCHANNEL interference problems using Gold-toGold 20 kHz 40 kHz interval 1000 ft separationparticularly dont fly directiy over another gets interesting Helicopter launched controlled old Silversticker RC5O AM transmitter remember its now being used 20 kHz interval case Continued page 42 May 1989 41 PERK/N AVIONICS ANNOUNCES Its newest product development scheduled availability late 1989 product serious RC Modeler would like simulate real dogfight engagement no damage model aircraft visual indicator winner interest you need find out about. MISSILE LOCK high tech non destructive model electronic weapon system outline Missile Lock capabilities Introductory Discount Certificate send $300 address MISSILE LOCK Perkin Avionics PO Box 396 Ellenwood GA 30049 145-CO VER Now fliers over world have neat inexpensive functional way protect R/C transmitters dirt dust rain Custom printed club logo Constructed durable canvas lifelong Velcro closure Available red blue green yellow orange black Colors can mixed size fits Send check money order KD GRAPHICS 3315 13th Avenue Columbus Georgia 31904 404/323-2787 9am-Spm EST DERS SHIPPED AY RECEIVED WARBIRD VIDEOSHSORBnA UR 23RD YEAR ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 SPE6IAL IWTRODLJ6IORY OFFER ALL 6 VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P61 Black Widow A-26 Invader NF 1454 ProgramslOG Mm Only $3995 WARBIRD CHECKOUT VOL 111 Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li. ] Day Night Money Order Check Credit Card Mastercard Visa American Express Shipping Paid Continental US-Foreign add $500 fornia residents add 6 1/2% tax NP VIDEO LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 might see glitch plane comes 1000/46 ft transmitter worst case 1000/144 t best case Its lit tle worse could live because cDs would set up flight patterns prevent actually getting close him Good re ceivers would protect both Now lets say he/she gets RC5O AM trans mitter narrow-banded Gold-stickered Better youre satisfied what he/she still tries get 5C455 OWBAM re ceiver interference might seen 1000/30 ft He/she WONT able live Pattern will com fortable Helicopter machine kept close 21M 23rd channel doesnt get first Prediction #2 Prediction #1 last months column Adjacent-channel interference wont problem people using Gold stickered systems good DC receivers whether 20 kHz 40 kHz raster Lets say person AM RC5O just talked about above pops Gold-sticker FM RC5O Tx module stands beside guy Gold-sticker FM RC49 Tx 20 kHz inter val Both stand another Pattern flight station 1000 ft away might overfly ing estimate could get 1000/16 ft have bad receiver 1000/9 ft have good receiver ought enough incentive get good receiver Actually potential interference isnt severe because two will standing 30 ft apart sideby-side holding transmitters butt-to-butt What learned FLS testing new M200 FLS numbers better old good enough eliminate need flight line frequency management 1991 still have use head Prediction #3 will still need FLIGHT LINE DISCIPLINE frequency pins flight stations fre quency management plans transmitter im pounds etc provide safe operating conditions 1991 particularly large contests sev eral events taking place same time same site People keep asking flight station plan 1991 know wrote flight station computer program hack wasnt good enough avoided adjacent-channel im age third-order interferences threw out channels People really wanted plan use OWBAM SC455s 50 channels will fly few planes time rural areas free commercial interfer ence have right use OWBAMs even-numbered channels using Owen Blacks Pacific Plan long able plan accommodates OWBAMS even-numbered channels has proven good plan might think can work up scheme protects wideband receivers simply pro hibiting simultaneous operation two trans mitters 23 channels apart single odd-channel RC Tx can generate 2IM interfer ence common carrier Tx operating frequency 22 RC channel numbers plus 10 kHz away like RC53 72400 old Orange/White 10-year-old receiver trying protect wideband enough af fected 2IM 23-channel problem cant fly odd-channel transmitters So 42 Model Aviation 3 dozen $400 ea 4 dozen $375 ea 5 dozen $360 ea 6 dozen $355 ea Add $400 shipping per order Please send good black white art reproduction Please specify quantity Trans-Cover colors ink color ordering Limit ink color per order WARBIRD CHECKOUT VOL IV Flying P-47 3 paris Flying T-6 3 parts NF 1366 ProgramshO MIn Only $3995 WARBIRD CHECKOUT VOL V Flying B-29 Pre-Flight BI7E Pre-Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 MODERN JET FIG Flying FIA18 Hornet Eagle F-16 and Thunderbirc hi 1LR B. mmeAfl Mm Anh youd left prohibiting odd-numbered RC channels locally praying no acci dents happen can see reasonable plans might generated current dual-conversion narrow-band SC455 receivers bccause free adjacent-channel image thirdorder problems practical basis WHEN USED WITH APPROPRIATE NARROWBAND TRANSMITTERS dont see plan can safely put old wideband SC4S5s 50 channels PARTICULARLY IF USED WITH WIDEBAND TRANSMITTERS see such plan has consider both transmitters receivers mixed up wide- narrowband Canadians lacking ready supply narrow-band equipment went system blocking out adjacent channels according oc cupied bandwidths accomplish purpose works USA odd-channel Tx complicate pic ture wideband SC455s channels already have difficulty large groups met ropolitan areas subject interfer ence adjacent-channel commercial radio Sepulveda Basin LAsee Dave Pelts Dis trict X Report AMA News January 1989 page 132 interference problems cannot controlled adopting Canadian scheme Maybe theres nothing worry about dont have use scanner youre acting like fisherman drowning worms havent clue whats out danger hobby whole clinging obsolete concepts AMA knew obsolete equipment would have aban doned 1991and told articles hobby industry improved products vendor now offers 1991 radio whether has certified AMA Guidelines Now insist channels attempt preserve 10-year-old equipment dealers wont stock new equipment odd channels FCC will notice away will go odd channels some other ser vice will leave Second maybe really should first someone using outdated equipment has serious accident loses lawsuit reason resulting legal precedent might put end RC hobby way law works must EVERYTHING YOU CAN avoid juring others get hurt anyway have pay AMA went self-insurance because premi ums high Now doing best can cling outmoded equip ment Can AMA afford attitude Con sider California parks playgrounds have closed because municipalities cant af ford premiums liability insurance would have have keep open much would individual have pay liability insurance continue RC flying AMA could insure sincerest appreciation George P Steiner pushed writing two-part essay George Robert F Aberle other friends criticized massaged early drafts until satisfied text saying correct things see defect what has written above have better way approach problems 1991 PLEASE DONT KEEP IT SECRET Write note Spend quarter Leader Small Airfoil Technology MASTER AIRSCREW four series choose Master Airscrew offers full line propellers flying application made tough glass-filled nylon superior strength durability GIF SERIES Designed sport flyer 0/F Series available 28 popular sizes 5-11 diameters K SERIES K Series designed 4 2 stroke applications Wide undercambered blades provide greater thrust slower turning 4 strokes 8 sIzes including new 12 x 8 15 x 10 tips painted safety ANTIQUE SERIES performance series features scimitar shape swept back tips plenty undercamber s suitable application Sizes 12 x 6 13 x 6 14 x 716 x 7 new 10 x 5 11 x 6 gold glass-filled nylon L 12 x 8 15 x 12 folding propellers geared systems 8 selffeathering adjustable pitch prop 05 direct drive give improved thrust glide less drag fixed blade props See Hobby Dealer tor MASTER AIRSCREW propellers accessories Windsor Propeller Company 384 Tesconi Court Santa Rose CA 95401 source lightweight materials P0 Box 16621 Dept M Irvine CA 92714 714250-1107 May 1989 43 r CARBON FIBER LAMINATES Aerospace Composite Products offers var ety r g d carbon f ber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$7O0 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add $300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order to
Edition: Model Aviation - 1989/05
Page Numbers: 40, 41, 42, 43
George M Myers Radio Thchnique 70 FrothItch Farm Rd Hlcksville NY 11801 An adjacent channel may either 40 kHz away distance between present evennumbered RC channels 20 kHz away will situation 1991 oddnumbered channels will put use use factor call M200 Factor designate times ffirther away YOUR transmitter MAY receiver compared far away INTERFERING transmitter IS re ceiver before interference occurs can find information very useful during takeoffs landings other fliers transmitters operating may also standing flight lineand model may pass closer to value M200 200 means terfering transmitters antenna could laid right receivers antenna having effect following table treat M200 being equal 200 purposes calculating averages Also above means interfer ing transmitter channel higher num ber control transmitter below means interfering transmitter lowernumbered channel M200 Adjacent-Channel Test Advantage over other transmitter Averaging above below tests tnterfering M200 Factors Transmitter TypeII DataHigh Low Avg Gold-sticker FM 40 kHz9200 212 1023 some test results time Dynamic Trio Gold-sticker AM 40 kHz 8 2001- 164 654 Gold-sticker FM 20 kHz9200 133 174 Myers/AberlelSteiner have subjected repre-Gold-sticker AM 20 kHzI107107107 sentative number new radios adjacent-Silver-sticker AM 40 kHz949098156 channel simulated flight line interference con-Silver-sticker AM 20 kHz914446 63 ditions Note Poiks Powerinax Merlin scored 200 40 kHz 137 20 kHz 157 23-channel separation WHATS AHEAD part two discus sion began last month Bob Aberle George Steiner have seen tested various ways some DC dual-conversion Rx including new Airtronics receivers Futaba 1024 PCM Polks Challenger 720 Worlds Expert Ace RICs Model 91 old Kraft KPR-8FD show some interesting characteristics 1 Adjacent-channel interference insignifi cant new dual-conversion DC receivers Gold-sticker transmitters 20 kHz channel sepa ration 1991 situation have less effect new receivers Silver-sticker transmit ters 40 kHz separation old receivers 1983-1987 situation 2 All new DC receivers ignore 21M sig nificantly better 31M resistance old SC4SSs Kraft KPR-8FD 5C455 single-conversion receiver 455 kHz local oscillator frequency Since -8FD best DC its time since Rxalonecost 1983 dollars com plete new World Engines system costs 1988 dollars relationship should give cause think about capabilities receiver now using Last month told going 40 Model Aviation After year time new channel flags Myers still sees transmitters Several manufacturers sell good ones Need something hold until can afford something permanent Make channel flag using 3 x 5 notepad Magic Marker some red yellow ribbon plus glue staples hold together ABSTRACT Predicted 1991 operating condi tionsPatI 2 Dual-conversion receivers fre quency management plans answer questions Narrow bandlwideband function equip ment what channel its have narrow-band set upper chan nels RC38-60 youre just better off other fliers channels took George less one-half hour equip seven transmitters up-to-date flags Cmon guys Anybody can afford Myers cheap flag Use Christmas ribbon nec essary should plenty half-price sales right about now Flight line simulation test put test transmitters butt-to-butt have 200 ft away control transmitter test receiver/plane goes between Nobody flies way promote butt-to-butt test because easy perform doesnt require special tools something can yourself have to measure 200ft baseline set up test condition move test receiver/plane toward butt-to-butt interfer ers measure record distance tween receiver/plane interfering trans mitters evidence interference first oc curs calculate M200 factor sub tracting last measurement 200 di vide result same distance important point test will clearly separate good/bad performers still box have good system can get receiver within 50 ft butt-to-butt pair before losing control would M200 xample two transmitters 15 ft 40 kHz apart produced interference 40 feet M200 tual test same two Tx buttto-butt setup produced interference 51 ft M200 light line eight real Goldsticker transmitters four AM four FM 15ft 40 kHz intervals produced interference 53 feet M200 utt-to-butt arrangement produces intermodulation signals exactly same interval 20 40 KHz separates two test transmit ters See figures Radio Technique column April 1987 issue page 24 re ceiver under test reacts being attacked about eight widely separated operating trans mitters Thats call Flight Line Sim ulation M200 Flight Line Simulation FLS Advantage over groups transmitters InterferingM200 Factors Transmitter PairN Data High Low Avg Gid FM/Old AM @40 kHz8855375 Gid FMIGld FM @40 kliz8902241 Old FM/Old FM@2OkHz8701638 Old FM/Gld AM@2OkHz8672541 Analysis statistics something fascinating about science gets such whole some returns conjecture out trifling invest ment fact Mark Twain Life Missis sippi Ch XVII Lets pretend its already 1991 Nats flying Pattern FM transmitter RC5 1 Sites different events separated 1000 ft Someone using RC49 FM trans mitter 40 kHz interval flying Scale Helicopter flying Pattern have good DC receiver might see interference plane got close transmitter 1000/212 t worst case data might see interference best case data can live RC5O 20 kHz interval danger zone would 0 94 ft essentially same Assuming have good receiver use good sense flying have no problem Likewise under normal circumstances Hel icopter would never wander far enough transmitter aware transmitter operating Therefore no ADJACENTCHANNEL interference problems using Gold-toGold 20 kHz 40 kHz interval 1000 ft separationparticularly dont fly directiy over another gets interesting Helicopter launched controlled old Silversticker RC5O AM transmitter remember its now being used 20 kHz interval case Continued page 42 May 1989 41 PERK/N AVIONICS ANNOUNCES Its newest product development scheduled availability late 1989 product serious RC Modeler would like simulate real dogfight engagement no damage model aircraft visual indicator winner interest you need find out about. MISSILE LOCK high tech non destructive model electronic weapon system outline Missile Lock capabilities Introductory Discount Certificate send $300 address MISSILE LOCK Perkin Avionics PO Box 396 Ellenwood GA 30049 145-CO VER Now fliers over world have neat inexpensive functional way protect R/C transmitters dirt dust rain Custom printed club logo Constructed durable canvas lifelong Velcro closure Available red blue green yellow orange black Colors can mixed size fits Send check money order KD GRAPHICS 3315 13th Avenue Columbus Georgia 31904 404/323-2787 9am-Spm EST DERS SHIPPED AY RECEIVED WARBIRD VIDEOSHSORBnA UR 23RD YEAR ANY TWO VIDEOS ONLY $7595 ANY 3 VIDEOS ONLY $10795 SPE6IAL IWTRODLJ6IORY OFFER ALL 6 VIDEOS ONLY $19995 WARBIRD CHECKOUT VOL 1 Flying P-40 Warhawk Corsair Hellcat SB2-A Buccanneer Avenger NF 1325 Programs2 Hr Only $3995 WARBIRD CHECKOUT VOL II Flying P-38 Mitchell Bomber P61 Black Widow A-26 Invader NF 1454 ProgramslOG Mm Only $3995 WARBIRD CHECKOUT VOL 111 Flying P-51 Mustang A-20 Bomber P-39 Introduction P-39 Advanced NF 1514 Programslb Mm Only $3995 CALL TOLL FREE CREDIT CARDS Li. ] Day Night Money Order Check Credit Card Mastercard Visa American Express Shipping Paid Continental US-Foreign add $500 fornia residents add 6 1/2% tax NP VIDEO LIBRARY 2554 LINCOLN BLVD #568 MARINA DEL REY CA 90291 might see glitch plane comes 1000/46 ft transmitter worst case 1000/144 t best case Its lit tle worse could live because cDs would set up flight patterns prevent actually getting close him Good re ceivers would protect both Now lets say he/she gets RC5O AM trans mitter narrow-banded Gold-stickered Better youre satisfied what he/she still tries get 5C455 OWBAM re ceiver interference might seen 1000/30 ft He/she WONT able live Pattern will com fortable Helicopter machine kept close 21M 23rd channel doesnt get first Prediction #2 Prediction #1 last months column Adjacent-channel interference wont problem people using Gold stickered systems good DC receivers whether 20 kHz 40 kHz raster Lets say person AM RC5O just talked about above pops Gold-sticker FM RC5O Tx module stands beside guy Gold-sticker FM RC49 Tx 20 kHz inter val Both stand another Pattern flight station 1000 ft away might overfly ing estimate could get 1000/16 ft have bad receiver 1000/9 ft have good receiver ought enough incentive get good receiver Actually potential interference isnt severe because two will standing 30 ft apart sideby-side holding transmitters butt-to-butt What learned FLS testing new M200 FLS numbers better old good enough eliminate need flight line frequency management 1991 still have use head Prediction #3 will still need FLIGHT LINE DISCIPLINE frequency pins flight stations fre quency management plans transmitter im pounds etc provide safe operating conditions 1991 particularly large contests sev eral events taking place same time same site People keep asking flight station plan 1991 know wrote flight station computer program hack wasnt good enough avoided adjacent-channel im age third-order interferences threw out channels People really wanted plan use OWBAM SC455s 50 channels will fly few planes time rural areas free commercial interfer ence have right use OWBAMs even-numbered channels using Owen Blacks Pacific Plan long able plan accommodates OWBAMS even-numbered channels has proven good plan might think can work up scheme protects wideband receivers simply pro hibiting simultaneous operation two trans mitters 23 channels apart single odd-channel RC Tx can generate 2IM interfer ence common carrier Tx operating frequency 22 RC channel numbers plus 10 kHz away like RC53 72400 old Orange/White 10-year-old receiver trying protect wideband enough af fected 2IM 23-channel problem cant fly odd-channel transmitters So 42 Model Aviation 3 dozen $400 ea 4 dozen $375 ea 5 dozen $360 ea 6 dozen $355 ea Add $400 shipping per order Please send good black white art reproduction Please specify quantity Trans-Cover colors ink color ordering Limit ink color per order WARBIRD CHECKOUT VOL IV Flying P-47 3 paris Flying T-6 3 parts NF 1366 ProgramshO MIn Only $3995 WARBIRD CHECKOUT VOL V Flying B-29 Pre-Flight BI7E Pre-Flight 8-24 NF 1553 Programsi 07 Mm Only $3995 MODERN JET FIG Flying FIA18 Hornet Eagle F-16 and Thunderbirc hi 1LR B. mmeAfl Mm Anh youd left prohibiting odd-numbered RC channels locally praying no acci dents happen can see reasonable plans might generated current dual-conversion narrow-band SC455 receivers bccause free adjacent-channel image thirdorder problems practical basis WHEN USED WITH APPROPRIATE NARROWBAND TRANSMITTERS dont see plan can safely put old wideband SC4S5s 50 channels PARTICULARLY IF USED WITH WIDEBAND TRANSMITTERS see such plan has consider both transmitters receivers mixed up wide- narrowband Canadians lacking ready supply narrow-band equipment went system blocking out adjacent channels according oc cupied bandwidths accomplish purpose works USA odd-channel Tx complicate pic ture wideband SC455s channels already have difficulty large groups met ropolitan areas subject interfer ence adjacent-channel commercial radio Sepulveda Basin LAsee Dave Pelts Dis trict X Report AMA News January 1989 page 132 interference problems cannot controlled adopting Canadian scheme Maybe theres nothing worry about dont have use scanner youre acting like fisherman drowning worms havent clue whats out danger hobby whole clinging obsolete concepts AMA knew obsolete equipment would have aban doned 1991and told articles hobby industry improved products vendor now offers 1991 radio whether has certified AMA Guidelines Now insist channels attempt preserve 10-year-old equipment dealers wont stock new equipment odd channels FCC will notice away will go odd channels some other ser vice will leave Second maybe really should first someone using outdated equipment has serious accident loses lawsuit reason resulting legal precedent might put end RC hobby way law works must EVERYTHING YOU CAN avoid juring others get hurt anyway have pay AMA went self-insurance because premi ums high Now doing best can cling outmoded equip ment Can AMA afford attitude Con sider California parks playgrounds have closed because municipalities cant af ford premiums liability insurance would have have keep open much would individual have pay liability insurance continue RC flying AMA could insure sincerest appreciation George P Steiner pushed writing two-part essay George Robert F Aberle other friends criticized massaged early drafts until satisfied text saying correct things see defect what has written above have better way approach problems 1991 PLEASE DONT KEEP IT SECRET Write note Spend quarter Leader Small Airfoil Technology MASTER AIRSCREW four series choose Master Airscrew offers full line propellers flying application made tough glass-filled nylon superior strength durability GIF SERIES Designed sport flyer 0/F Series available 28 popular sizes 5-11 diameters K SERIES K Series designed 4 2 stroke applications Wide undercambered blades provide greater thrust slower turning 4 strokes 8 sIzes including new 12 x 8 15 x 10 tips painted safety ANTIQUE SERIES performance series features scimitar shape swept back tips plenty undercamber s suitable application Sizes 12 x 6 13 x 6 14 x 716 x 7 new 10 x 5 11 x 6 gold glass-filled nylon L 12 x 8 15 x 12 folding propellers geared systems 8 selffeathering adjustable pitch prop 05 direct drive give improved thrust glide less drag fixed blade props See Hobby Dealer tor MASTER AIRSCREW propellers accessories Windsor Propeller Company 384 Tesconi Court Santa Rose CA 95401 source lightweight materials P0 Box 16621 Dept M Irvine CA 92714 714250-1107 May 1989 43 r CARBON FIBER LAMINATES Aerospace Composite Products offers var ety r g d carbon f ber/epoxy sheets add stiffness almost material- fiberglass foam bal sawood laminates can used reinforce foam wings leading trailing edges wing spars Carbon Fiber bonds easily slow setting cyanoacrylates 5-minute epoxies laminate can stripped narrower widths CL-i 007 thick 1x48-$500 1x72-$7O0 CL-2 014 thick 1x48-$800 1x72-$1100 Send SASE information additional sizes products Add $300 shipping handling Calif residents add 6% tax Overseas orders add 15%-Order COD send check money order to