Thanks for the suggestions,
1st the side tone on TX, the side tone comes from the 328 Chip, pin 15, if i look at that with a scope i do get a square wave signal BUT its at 42KHz not the normal 700Hz or so , no idea why as thats straight from the chip. it looks a good square wave signal but just the wrong freq????
this can be seen at R59 but of course at 42KHz it cant be heard (unless your a bat)
now with the menu 8.7 set i get the two different freq coming out of the synth chip with a difference of 700Hz CLK 0/1 at 7.0193Mhz and CLK2 7.0200Mhz (so 700Hz difference) but that is not making it through the receiver, i have checked the input to the phase network on the scope and i cant see anything there at all (could be my insensitive scope) but no tone in the receiver just a background hiss that is slightly more noisy when 8.7 is active.
i have isolated from the filter to the headphones and that seem to work when i connect a external signal source so i guess thats all ok.
really stuck now and hoping Hans can give some magic advice but i am feeling its game over for this one :-(
it looks like IC4 may not be working as i have checked and double , then triple checked the windings on T1 and they all measure as they should between winding's .
cheers to all