Hi ny_racer_xxx

I should mention I was looking at the 35 MHz transmitter, not the 72. I've never seen the 72, since it can't be used in Australia...

The W22D transmitter should be different from the W4 transmitter, due to the tail servo. I suspect it's closer to the 22A transmitter, perhaps with
a channel removed... How many servo sockets does it have? (If it has 6, then it is probably like the 22A).

The 22A transmitter does not work with the Futaba receiver at all, from my tests, although it does have something like 6 analogue channels and
about 6 Digital channels from memory... !!! I recall that the 22A TX sends all the analogue channels seperately, and mixes at the receiver, not the
transmitter. It also sends both switch channels, about 3 dipswitch channels and one channel which contains a swinging digital signal (on/off/on/off
cycle) which I think it uses to authenticate the TX.

I never tried re-XTAL'ing the 22A TX so don't know if that works, but I suspect it does.

In one mode, it also connects the left-side switch on the the TX to output 5 on RX from memory... Probably so you can connect a Camera, but that option is not available on the 120* CCPM setting. It might work with the 22D?

David