I start with my original suggestion for old radios such as this. "Clean
connectors". All of them. One at a time, unplug the connector, using a
Q-Tip with contact cleaner applied, scrub the male pins. Then push the
connector on and off a couple of times to wipe the female contacts.
Drifting.....is the master oscillator drifting? Could be the oven
cycling excessively. Or could be a BFO crystal, although that would
likely affect all bands. However, they are in the rear near the PA and
the heat migrates noticeably into that area. They are really not
temperature compensated.
Yes, you can tweak the coils on the band oscillator board to get them on
frequency but usually something else is causing drift. Bad BFO cap has
been known to do this.
Check the BFO alignments per the manual, and in the order defined for
all modes using a frequency counter.
73
Bob, K4TAX
On 6/27/2018 8:38 PM, Stan Gammons wrote:
Hi Everyone,
My Omni VI has decided to throw a few more fits. First the frequency
jumped on 30 meters, but FT8 signals still decode fine. So I let it go
and didn't mess with it. Lately 40 meters has started throwing fits
and it's much worse than 30 meters. Looking at the FT8 waterfall, at
times it will drift during the 15 seconds and it's bad enough the FT8
signal won't decode. I sent another email to the list with the
waterfall pic attached, but the message was too large and got
rejected. I tried tweaking the coils on the crystal oscillator
board. It might have helped 30 meters a little. Doesn't seem to have
done much/anything for 40 meters though. Crystals gone bad maybe? If
so, anyone know a source now that ICM is no more?
73
Stan
KM4HQE
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