[crackle]

Hi Ian
Thanks for your reply, I will double check the unused coil is grounded, I am pretty sure it is, and I will try and source some 270pf polystyrene caps.
Yes the zener did not help, the frequency drifting happened after the unit had been on for a few hours and at the moment I cant remember if it went up or down.
Since reading more on this subject of mini AM tx's I have saw that if there is any FM content in the output it can be evident by there being a bit of a dip in the tuning. My minimod was behaving like this, and the best quality and audio volume reception on the radio was with the minimod slightly off tune.
If this is FM causing this are there any particular pointers to stop it. (e.g. layout issues) I will take some photos of my one which is made on veroboard.

I will get the project out again and try some new caps when they arrive.
Thanks
Mike