I ran a few informal tests the other day. I set a pair of JR 9303
TXs with synth modules to the same frequency, one on PPM and one on
PCM. Then, I laid out two receivers - a JR R700 and an R770.
Results? WIth both transmitters on, servos on the PPM R700 were
totally out of control. No surprise there. But the R770 was totally
quiet, only responding to the PCM TX.
At the field results were the same. The R770 seemed to ignore the
PPM transmitter altogether, responding perfectly to inputs from the
PCM TX only. My theory is that new folks who may not be so keen on
frequency control yet are likely to be using PPM. PCM gives me an
extra margin of protection from frequency conflicts.
Has anyone else tried this? Or had a PCM RX glitched on the same
frequency by a PPM TX? Is it unrealistic to think that PCM gives you
an extra level or protection from interference from rogue PPM receivers?
Cheers - Jim
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