[TenTec] Omni VI opt 3.... PLL problem

[Jim Goudie]

Thanks, Pete…

I didn’t check all the bands carefully or systematically.  I heard it on several.  I’ll go back and be more careful about it.  And yes, it seems to happen after it has been on for a while…. but not very long; 5 minutes or so?  

If it gets too involved, with the crystals and setting the lock range, etc., I may have to punt.  My experience and my “bench” may not be up to the challenge.  We’ll see.

Thanks very much for your input.  I’ll save all the help I get and refer to it as the project progresses.  Fortunately, I have my old trusty 544, Triton IV digital, that I bought used in 1982 ;-).  It is enjoying being my #1 radio again… and doing quite well.

73!
Jim  AF3Z


Jim Goudie   —  jagoudie at comcast.net
610 Kraybill Church Rd
Mount Joy, PA 17552

> On Jan 27, 2022, at 10:32 PM, Peter Bertini <radioconnection at gmail.com> wrote:
> 
> First, does it only on a few select bands, or on all bands?  If one or two
> bands only chances are it is a hetrodyne crystal that has aged and is going
> out of lock.  Some of those crystals are used one more than one band.  One
> clue is that the rig will work well when cold, and then act up when the
> pizza oven that encloses those PLL boards gets hot.  TenTec provided no
> airflow, and there are two pass regulator transistors on the aluminum lid
> that adds to the heating problem.  There is a procedure for setting the
> lock range for each crystal that requires using a good scope to monitor a
> point on the uP control board.  I've fought that problem on three or four
> Omni VI rigs I own. Pete
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