Yes it is, "W" says so. j/k

Acutally, I did notice the UK as the location, but I didn't know that all the transmitters shift the same way on 35Mhz. I wonder why this is. Do you know if everyone is shifting positive or negitive? I wonder why whichever manufacturer shifts one way on 72Mhz and the other way on 35Mhz does things that way.

While writing this, it occued to me that they could be shifting "both" ways on 35Mhz, which again leads me to wonder why it's different on the two bands.

Actually, as I understand it, PPM is, in fact properly called PPM/FM (or was that FM/PPM, I forget). Neither PPM or FM alone is actually acurate. PPM is Pulse Position Modulation and PCM is Pulse Code Modulation. Both both describe how the data is organized, but not necessarily how the wave is actually affected.

PCM is usually FM. You could, in theory, have an AM PCM system, though I doubt anyone has done so. So, when you say PCM, it's clear you mean FM/PCM. The existing AM and FM sets are all PPM, which is why PPM is shorted to "FM" rather than saying FM/PPM all the time.

At least that's how I understand it.