Ermmm Corret if I am wrong BUT both PPM and PCM are digital signals. Where does the analogue factor come into it ?
PPM as he name implies is Pulse Position NOT Pulse Amplitude ( aka PAM ). The Pulse position varies in accordance to the stick movement ( in its most basic term )
PCM being Pulse Code is where the intelligence is carried within the coding of the PCM signal. With the JR it can be either 9 Bit ( ZPCM ) or 10Bit (SPCM ) thus giving either 512 or 1024 levels. This also why PCM can have inbuilt Failsafe as the decoding is carried out by a dedicated processor with inbuilt memory. The JR ZPCM can have different response delays of 0.3, 0.5 or 1 second before FS operates or just left on Hold. Cant remember what the SPCM delay is.
PPM is said to be the
analog of the transmitter stick position. The mechanism by which the pulse width, of a given pulse in a Pulse Position scheme, is varied is by use of analog integration over time.
Yes it is a digital signal whose pulse width is the analog of the transmitter stick position for a given channel.