[TenTec] OmniVI+ 30M L.O. instability

[Jack Mandelman]

Steve,

Thank you for the info on how you accessed the LO coils.   I made a copy for future reference.  Since my problem occurs (so far) only when it's extraordinarily warm in the shack, I'm postponing any attempted repair.

73,

Jack K1VT

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Jack,

It's a few months since I had the same problem with my Omni VI on 160m. 
If I remember correctly I was able to unbolt the FM and Driver boards 
and flip them carefully to one side to get access to the mixer board. I 
put a piece of thick paper under them to prevent shorts to the chassis 
in their temporary position. I believe there was also at least one lead 
I left disconnected from these boards to allow them to "flip" out of the 
way, but which had no effect on the basic functioning of the Tx/Rx. It 
should be obvious which they are.

There was a useful posting a few months ago on the list about how to 
adjust the Crystal. It involved monitoring the pulse width on the PLL 
chip. I did mine by monitoring the PLL control voltage, but I did find 
that setting it mid-way between the 2 lock points didn't always give 
best results. So the pulse width method is probably the way to go.

And as others have said, be careful of those cores - I cracked one, and 
then the whole board has to come out!

73,
Steve G3TXQ