For those who keep track of this sort of thing, I had purchased an Omni 6 with
what appeared to be a CPU problem (gobbledegook on the display).
I was prepared to acquire yet another parts set…
What made me think it was worth tinkering with was the fact that the problem
was thermal, with a time constant roughly that of the crystal oven.
I had some spare ovens so no worries there but this was certainly not the root
cause of the problem.
I found that the 20 MHz reference went away as the oven heated up.
I injected 20 MHz from my signal generator and all was well.
I found a bag of proper 20 MHz crystals on the auction site. They are perfect
as a mechanical fit and they went into the circuit perfectly and I was able to
calibrate dead-on to 20 MHz.
The radio now works perfectly.
Now I am left with a bag of about 39 of these crystals. If anyone needs one,
drop me a line.
$10 shipped in CONUSA.
Gary
W0DVN
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