Had a similar problem with my V. What is your ambient temperature?
If it is high, that might cause the problem. There is some sort of paste
in a small can in the rig. se if it is dried out.
Quoting Don Rasmussen <email@example.com>:
> Hi Guys,
> My OMNI 564 started acting a little odd today, I thought I would see if
> anyone has any suggestions as far as things to consider before packing the
> unit up for shipment to the factory for service.
> What happens is, when the radio is started from cold at 28.400 everything is
> normal listening on SSB. After some time, the VCO will seem to lose lock and
> we lose receive audio and no transmit. This will come and go for 30 minutes.
> If I arrow up 100KHZ the radio will return to a normal state. If I dial back
> down towards 28.400 the radio will tune normally until it gets somewhere near
> 28.440 where it will go silent.
> That is to say after the radio went silent at 28.400 and I tune up to 28.480
> it would remain silent. However, if it went silent at 28.400 and I arrow up
> or tune up 150 khz and then tune back down, when I arrive at 28.480 the radio
> will be working.
> I was looking at the L.O Mixer board (page 4-14 in the manual) and I can see
> where there are 10 crystals and one would be selected at 28.0, 28.5, 29.0 and
> 29.5 so maybe we have a marginal crystal in the 28.0 position. However I
> wonder why the crystal is okay at 28.475 all of the time and failing at
> 28.400. You would assume the crystal would fail up until the 28.500 point
> where the next crystal in sequence would be selected.
> There is a variable inductor at L17, wondering about that one.
> All of the other bands and frequencies work 100%, just this one small bugaboo
> in this one spot and so far only when the radio is cold.
> Any ideas on things to check would be welcome.
> Don wb8yqj/6
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