[drakelist] TR7 frequency shift

[Mike Williams]

Well, here is the problem...The Tr7 is solid with the exception of a slight warble in the receiver.  When sitting on a frequency listening to a cw signal or just tuned to the calibrator, the frequency will shift perhaps 80  or 100 cycles.  Enough to be audible and annoying.  This started shortly after I cleaned the main shaft of the PTO with De Oxit and followed up with a clean q tip to remove the residue.  I have cleaned the PTO's on my 4 line many times and not experienced this.  I think it is the PTO but I thought I would throw this one out to the group for comments and advice.   As always, thanks for any input!   Thanks,   Mike W4DL