PCM or PPM? - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-28-2004, 02:03 PM   #11
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No harm in doing so, and the effort is not that great, especially when considering the cost of missing a potentially escallating problem like a cracked header....

With PCM, signal degradation shows up differently than PPM. If you know what to look for, you won't have to install a PPM Rx to detect noise, simply run up the engine on the ground, cycle all control surfaces rapidly and watch for any hesitation or jerky movement. With PCM under rapdily (realtive to human speed) intermittent interference, servos don't perform random movement, they hold last position.

Another option is to install a glitch counter. These devices are available aftermarket ... I'm waiting for the day some smart manufacturer includes them ... escpecially one in the validation part of the signal stream as oppoesed to downstream in the failsafe area where most aftermarket devices reside. ARE ANY MANUFACTURERS LISTENING?
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Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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Old 10-28-2004, 08:52 PM   #12
Steven Dew
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Thanks Jim for you note on how to
check for interference on a PCM Rx.
I will still use the PPM for initial check out,
at least till I get more comfortable with PCM,
but having idea what to look for on a PCM
is useful info.

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