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@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@comcast.net
> 610 Kraybill Church Rd
> Mount Joy, PA 17552
>
>> On Jan 27, 2022, at 10:32 PM, Peter Bertini <radioconnection@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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