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-   RC Radios, Transmitters, Receivers, Servos, gyros (https://www.rcuniverse.com/forum/rc-radios-transmitters-receivers-servos-gyros-157/)
-   -   AM or FM and what to use? (https://www.rcuniverse.com/forum/rc-radios-transmitters-receivers-servos-gyros-157/1627656-am-fm-what-use.html)

VelocitySS 03-15-2004 06:02 PM

AM or FM and what to use?
i've got a nitro 4-tec and was looking 2 upgrade to a FM radio to get more range and also less glitching. [sm=confused.gif]i'm not too familar with fm radios so i dont know what i would have to up grade. i've heard that i have to change my servo's also? just want a straight answer and possibly some sugestions. i would olny need a 2 ch. or 3 ch. radio if that helps.
thanks alot in advance.:D

wisdom-seeker 03-16-2004 12:05 AM

RE: AM or FM and what to use?
The servos are not part of the equation. What must change are the transmitter and receiver. Most servos are run by the same type of signal regardless of how the receiver gets it from the transmitter.

VelocitySS 03-16-2004 04:11 PM

RE: AM or FM and what to use?
ah ok, yea i was thinking that but wsnt sure, have any sugestions for radio's/ recievers? spesific pistol grip.

wisdom-seeker 03-16-2004 04:38 PM

RE: AM or FM and what to use?
Generally, FM has better noise rejection, and is less susceptable to interference. FM can be used to encode either PCM or PPM. Of the two, PPM responds to interference by servos twitching. PCM responds to noise by "lockout and failsafe". This means that the receiver rejects a signal that does not meet the correct signal pattern, and the failsafe is what you define (in advance) that the receiver should do with the servos in the absence of a signal. On a car, this might be steer straight and motor off.

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