Edition: Model Aviation - 1989/08
Page Numbers: 12, 13

If youre thinking about bu heres few words Consider need kind equipment required operate crowded radio control environment Heres what look narrowbaud RC what will take job Heres basics whats vo1v. havent kept up issues surrounding changes radio control environ ment youre probably aware theres lots confusion con flicting information about new channels have recently added channels 14 through 34 plus odd num bered channels that11 activated near future Most youre probably concerned about kinds radios may need trouble-free flying new radio climate Well best way clear up issue what kind radios may needed tell you may need Lets start filling 50-channel spectrum needs 50 channels anyway Ever asked question Well have thousands fellow RCers Prdblem theres no simple answer question Just clear record however didnt accept 50 channels just because thought wed need operate simultaneouslyeven large contests busiest flying sites hold leads believe fewer channels spaced further apart would cure interference problems youd better think again real reason 50-channel RC model aviation spectrum Back applied new channels thatd better separated surface channels offered fifty kind take-it-or-leave-it basis exclu sive channels definite improve ment over what because werent shared other users other hand still located pretty tough neighborhood As chart shows commercial channels stuck smack-dab between new RC channels made available So no matter whether took other third one RC channels might strn 10 kHz away pair powerful potential interferers depending upon local area situation Anyhow took 50 channels offered because figured thered lots channels work various flying sites lost use some channels result inter ference commercial opera tions regions far could tell applications commerial channels rise story doesnt end What weve learned since granted new channels As weve explained accepted 50 channels because time numbers seemed like viable defense against interference commercial neighbors world electronics few years like century meantime technological advances have actually made feasible make RC radios selective enough resist interference closest threateningly aimed high-powered commercial channels So focused attention urging radio people produce kind true narrowband equipment thats good enough deal 10 kHz away big guys As result some wonderful things may expected First losses usable RC channels result interfer ence commercial channels should dramatically reduced now future Second would 12 Model Aviation 72MHz COMMERCIAL CHANNELS 72140 72180 72180 72200 72220 lilililil 72150 72170 72190 72210 RC1S ROD R020 R021 72 MHzRC MODEL AVIATION CHANNELS Heres segment 50-channel RC spectrum showing relates adjacent commercial channels As can see potential interference commercial channels same whether use just patt RCchannels will available g narrowband RC radio advice AMA using kind highlyselective narrowband equipment concerns about flyer-to-flyer interference would virtually eliminated Plus well have smoother transition enhanced convenience channels can give us really practical produce kind radios need answer yes already some excellent units market some encouragement confident radio industry will soon provide lot choose Besides experts agree radios like talking about arent tough design produce openers narrowband transmitters snap adequately interferenceresistant receivers bit difficult can built coming within country mile leading edge technology Best radios future dont have cost arm leg can buy excellent narrowband sport radios little accustomed spending ordinary wideband equipment What buy up local situation need narrowband heres spot real thing minimal regulation hobby receives has permitted lots misleading advertising appear organizations like AMA have reluctant publish test reports product recommenda tions out concern wed find ourselves up necks lawsuits filed offended injured users product manufacturers So isnt fair expect become electronics expert its own best interest least become bettereducated consumer can start raising radio IQ studying box section talks about shop narrowband radio follow its suggestions youll definitely reduce doubt about what look few tips interference-free flying meantime 1 Dont operate RC trans mitters currently-used channels unless theyve checked spectrum analyzer compliance AMA guideline minimums -35 db @ 20 kHz out use 40 kHz channel-spacing minimums will qualify transmitter AMA silver sticker indicates AMA approval its use current channels 38-56 Ifas majority recently manufac tured units doyour transmitter meets AMA minimums narrow band operation -55 db @20 kHz out itll qualify AMA 'gold' sticker indicating AMA approval its use channels now after future activation odd channels have transmitter checked free charge take major trade shows service available Otherwise make inquiries via radios manufacturer have checked spectrum analyzer independent authorized service station 2 If club fortunate enough govern its flying site make rules prevent use unchecked transmitters make rules stringent club feels appropriate 3 If arent member AMA chartered club join Chances theyll have fieldoperation rules designed minimize interference Plus youll tuned information activities 4 If youre club hasnt regulated its site flight station spacing and/or other inter ference-prevention techniques find out what other clubs doing adopt system suits clubs needs AMA Largest Sport Aviation Organization FOR MORE INFORMATION WRITE OR TELEPHONE AMA The Academy Model Aeronautics 1810 Samuel Morse Drive Reston VA 22090 703 435-0750 August 1989 13 Four rules follow shop narrowband radio I Steer clear radios advertised vague narrowbandor 1991 claims Instead look specific claims advertised receivers transmitters meet exceed a//of AMA Radio Guideline parameters narrowband 20 KHz channelseparation operation 2 Scan modeling magazines radio test reports use actual lab measure ments backed up demanding field trials basis evaluations Good reports should also include impressions overall product quality 3 When purchasing radio make clear dealer youre interested considering equipment meets exceeds AMA Radio Guideline values 4 When evaluating radio try look beyond bells whistles Satisfy yourself manufacturers first priority same yours reliable perfor mance derived use high-quality components exacting assembly * AMA Radio Guidelines rransmillers Receivers appear ports 3 4 AMA Radio Guidelines page 12 t969 AMA Membership Manual Although Should presumed measurements therein listed will guarantee interference-tree pertormance under oil conditions extensive testing has indicated equipmenl meets exceeds Guideline parameters con expecled yield reliable operation 1991 20 KIls narrowbond environmestwben nominal usage precautions observed
Edition: Model Aviation - 1989/08
Page Numbers: 12, 13

If youre thinking about bu heres few words Consider need kind equipment required operate crowded radio control environment Heres what look narrowbaud RC what will take job Heres basics whats vo1v. havent kept up issues surrounding changes radio control environ ment youre probably aware theres lots confusion con flicting information about new channels have recently added channels 14 through 34 plus odd num bered channels that11 activated near future Most youre probably concerned about kinds radios may need trouble-free flying new radio climate Well best way clear up issue what kind radios may needed tell you may need Lets start filling 50-channel spectrum needs 50 channels anyway Ever asked question Well have thousands fellow RCers Prdblem theres no simple answer question Just clear record however didnt accept 50 channels just because thought wed need operate simultaneouslyeven large contests busiest flying sites hold leads believe fewer channels spaced further apart would cure interference problems youd better think again real reason 50-channel RC model aviation spectrum Back applied new channels thatd better separated surface channels offered fifty kind take-it-or-leave-it basis exclu sive channels definite improve ment over what because werent shared other users other hand still located pretty tough neighborhood As chart shows commercial channels stuck smack-dab between new RC channels made available So no matter whether took other third one RC channels might strn 10 kHz away pair powerful potential interferers depending upon local area situation Anyhow took 50 channels offered because figured thered lots channels work various flying sites lost use some channels result inter ference commercial opera tions regions far could tell applications commerial channels rise story doesnt end What weve learned since granted new channels As weve explained accepted 50 channels because time numbers seemed like viable defense against interference commercial neighbors world electronics few years like century meantime technological advances have actually made feasible make RC radios selective enough resist interference closest threateningly aimed high-powered commercial channels So focused attention urging radio people produce kind true narrowband equipment thats good enough deal 10 kHz away big guys As result some wonderful things may expected First losses usable RC channels result interfer ence commercial channels should dramatically reduced now future Second would 12 Model Aviation 72MHz COMMERCIAL CHANNELS 72140 72180 72180 72200 72220 lilililil 72150 72170 72190 72210 RC1S ROD R020 R021 72 MHzRC MODEL AVIATION CHANNELS Heres segment 50-channel RC spectrum showing relates adjacent commercial channels As can see potential interference commercial channels same whether use just patt RCchannels will available g narrowband RC radio advice AMA using kind highlyselective narrowband equipment concerns about flyer-to-flyer interference would virtually eliminated Plus well have smoother transition enhanced convenience channels can give us really practical produce kind radios need answer yes already some excellent units market some encouragement confident radio industry will soon provide lot choose Besides experts agree radios like talking about arent tough design produce openers narrowband transmitters snap adequately interferenceresistant receivers bit difficult can built coming within country mile leading edge technology Best radios future dont have cost arm leg can buy excellent narrowband sport radios little accustomed spending ordinary wideband equipment What buy up local situation need narrowband heres spot real thing minimal regulation hobby receives has permitted lots misleading advertising appear organizations like AMA have reluctant publish test reports product recommenda tions out concern wed find ourselves up necks lawsuits filed offended injured users product manufacturers So isnt fair expect become electronics expert its own best interest least become bettereducated consumer can start raising radio IQ studying box section talks about shop narrowband radio follow its suggestions youll definitely reduce doubt about what look few tips interference-free flying meantime 1 Dont operate RC trans mitters currently-used channels unless theyve checked spectrum analyzer compliance AMA guideline minimums -35 db @ 20 kHz out use 40 kHz channel-spacing minimums will qualify transmitter AMA silver sticker indicates AMA approval its use current channels 38-56 Ifas majority recently manufac tured units doyour transmitter meets AMA minimums narrow band operation -55 db @20 kHz out itll qualify AMA 'gold' sticker indicating AMA approval its use channels now after future activation odd channels have transmitter checked free charge take major trade shows service available Otherwise make inquiries via radios manufacturer have checked spectrum analyzer independent authorized service station 2 If club fortunate enough govern its flying site make rules prevent use unchecked transmitters make rules stringent club feels appropriate 3 If arent member AMA chartered club join Chances theyll have fieldoperation rules designed minimize interference Plus youll tuned information activities 4 If youre club hasnt regulated its site flight station spacing and/or other inter ference-prevention techniques find out what other clubs doing adopt system suits clubs needs AMA Largest Sport Aviation Organization FOR MORE INFORMATION WRITE OR TELEPHONE AMA The Academy Model Aeronautics 1810 Samuel Morse Drive Reston VA 22090 703 435-0750 August 1989 13 Four rules follow shop narrowband radio I Steer clear radios advertised vague narrowbandor 1991 claims Instead look specific claims advertised receivers transmitters meet exceed a//of AMA Radio Guideline parameters narrowband 20 KHz channelseparation operation 2 Scan modeling magazines radio test reports use actual lab measure ments backed up demanding field trials basis evaluations Good reports should also include impressions overall product quality 3 When purchasing radio make clear dealer youre interested considering equipment meets exceeds AMA Radio Guideline values 4 When evaluating radio try look beyond bells whistles Satisfy yourself manufacturers first priority same yours reliable perfor mance derived use high-quality components exacting assembly * AMA Radio Guidelines rransmillers Receivers appear ports 3 4 AMA Radio Guidelines page 12 t969 AMA Membership Manual Although Should presumed measurements therein listed will guarantee interference-tree pertormance under oil conditions extensive testing has indicated equipmenl meets exceeds Guideline parameters con expecled yield reliable operation 1991 20 KIls narrowbond environmestwben nominal usage precautions observed