On Tue, Feb 6, 2024 at 11:26 AM, Jim Shorney wrote:
For slow drift I would suspect a problem with one of the voltage regulators or maybe the master crystal oscillator.
After further review (of the ckt diag and ToO section of the manual, my first guess is voltage regulation of the VCO or VCXO.Basically eveything works, just some slight drift. I'll change over from soldering iron to scope, VOM, and counter and see what I can find.
BTW: I emailed Ron, WB4HFM, to see if he could suggest things to look for or perhaps take a look himself and he replied he no longer works on RV75's. So it looks like I am on my own, but with a distant but able assist from the assembled multitude here!
Rick
K8EZB
