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Feb 06, 2018, 12:27 PM
CoopDrone Pilot
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Transmitter Waveform Analysis


Has anyone looked on a RF Spectrum Analyzer at the PCM waveform from a spread spectrum transmitter?

Thanks'

Bill W
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Feb 06, 2018, 12:49 PM
Sagitta Fanboy
1. There is no PCM waveform, as the modulation used is not PCM for any modern TX. QPSK and similar modulations are used. PCM is a method of modulating a sampled analog signal (the PPM pulsestream in the case of PCM transmitters). The signal is purely digital for modern systems.

2. You can see the spectrum analysis of the systems on the FCC certification documents.
Feb 07, 2018, 03:01 AM
Registered User
Futaba PCM analysed here:
http://autopilot.sourceforge.net/pcm.html

Each brand has his own encoding, unlike PPM which is de facto standard for all, with small variations.


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