Hi mackrackit,

I've made the changes and the Transmitter lights the it's reference led about once every nine seconds but doesn't transmit at all (doesn't seem to get that far).

I still can't get my head around how the WDT associates with the loop COUNTER, plus the more I read on this it seems that if the WDT isn't reset back to zero before it reaches FF+1 (I think) it then reboots the program which makes sense....Mmm, more reading and thinking to do, interesting though.

Dave