[TenTec] Omni VI frequency jumping/drifting

[Bob McGraw K4TAX]

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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