Only now do I have a chance to react to some of the suggestions...

I guess one poster here is right, I will just have to fiddle a bit more
with the pi network (since at the B+ voltages suggested here my plate
current would be way high) and I will have to live with the chirp. Nobody
has complained yet anyways and maybe the chirp is worse in my receiver than
on the air, as someone here suggested. By the way I use a Icom R75 for a
receiver and switch the antenna off during transmit-still plenty of a signal
seems to get into the receiver anyways.

By the way, I see suggestions how to just "stretch" crystal controlled
oscillators a bit by adding a suitable coil and capacitor in series with the
crystal. Has anybody tried that with the AC-1??
Would be nice to be able to get out of the ways of some of the big power
guys.
Any suggestion would be welcome.

Uwe