Originally posted by Lynx
Accepting in order to be standard the Frequency shift has to be identical, otherwise someone using a positive shift on 72 would hit someone using a negative shift on 73. The core frequencies are identical only the pulse itself is reversed.
Unfortunately, I don't have access to an airtronics radio at this time (only Futaba & Hitec), but here's a picture of a Hitec PPM signal from a scope. However, all the technical data I have read indicates the image I posted earlier is an accurate representation. The amount of shift is nowhere near enough to come close to the neighboring RC channel. Don't forget, between each of our channels, there is another channel for the primary frequency users of the 72Mhz band.
If I can borrow an Airtronics Tx, I will post a side-by-side comparison of the scoped signal.