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

[Jim Goudie]

Yes, Pete.   I’d appreciate receiving that procedure as well.  It makes a lot of sense… and I feel more encouraged to give it a try!  My problem definitely only shows up after the rig warms up…

Thanks again!
Jim  AF3Z

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

> On Jan 28, 2022, at 4:22 AM, gerd Groos <df9ts.cw at gmail.com> wrote:
> 
> Pete, 
> 
> could you share the procedure you mentioned? I have a OMNI VI that I love. PLL board has the two PLL circuits out of sync, I have no continous frequency output from VFO anymore.
> Checked and tried a lot, hardware seems ok, just need to know how to do the adjustments.
> 
> BR
> 
> Gerd DF9TS
> 
>> On 28. Jan 2022, at 05:28, Jim Goudie <jagoudie at comcast.net> wrote:
>> 
>> 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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>> 
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