[TenTec] TenTec Digest, Vol 229, Issue 8

Cubbie jstanisi at comcast.net
Fri Jan 28 14:53:18 EST 2022


Hi Jim, not sure I can help troubleshoot your current problem but,

I had some trouble with the PLL board on my OMNI VI + which turned

out to be a solder bridge from the factory. Only way I found it was to

make extension cables because I had to use a "RF sniffer" to find the

noise while the radio was on.  I used these:

https://www.amazon.com/female-jumper-Dupont-Arduino-Breadboard/dp/B01FDD3LJA

and epoxied the black connectors together on both ends. You need two 3 
wire ones

and one 2 wire one. Good luck.....Jim WGØD

On 1/28/2022 11:00 AM, tentec-request at contesting.com wrote:
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> Today's Topics:
>
>     1. Omni VI opt 3.... PLL problem (Jim Goudie)
>     2. Omni VI opt 3.... PLL problem (Peter Bertini)
>     3. Re: Omni VI opt 3.... PLL problem (Jim Goudie)
>     4. Re: Omni VI opt 3.... PLL problem (gerd Groos)
>     5. Re: Omni VI opt 3.... PLL problem (Jim Goudie)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 27 Jan 2022 20:05:35 -0500
> From: Jim Goudie <jagoudie at comcast.net>
> To: Ten-Tec List <tentec at contesting.com>
> Subject: [TenTec] Omni VI opt 3.... PLL problem
> Message-ID: <B8A77BA3-9BB2-4567-8412-2AAD8B5CAA1F at comcast.net>
> Content-Type: text/plain;	charset=utf-8
>
> Hello,
>
> [ I sent this a day ago?.  and it never appeared, so trying again ;-). ]
>
> I have an option 3 Omni VI that has developed a gargley warbley wobbly intermittent sound heard on Tx and RX, and I also hear it on the 5-5.5mhz PLL signal.  At times, that ?noise? seems to be affected by mechanical bumps and repositioning the chassis.   So, I opened things up?. ?exercised connectors,? cleaned up and re-soldered areas on the PLL board that looked suspicious, and didn?t find much else.  Before going deeper, I decided to put it back together and see if my initial work had solved the problem.
>
> I was very encouraged for a while.  I was even tweaking the alignment before planning to put it back in the case.   But then?. it warbled again.  It seems to be making the noise less often so far, but ...
>
> Any advice/experience with what might be wrong or how to proceed?  There?s no direct access to the 5 mhz PLL board during normal operation?  So? I?m open to suggestions?
>
> Thanks,
> Jim  AF3Z
>
> Jim Goudie   ?  jagoudie at comcast.net
> 610 Kraybill Church Rd
> Mount Joy, PA 17552
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 27 Jan 2022 22:32:22 -0500
> From: Peter Bertini <radioconnection at gmail.com>
> To: tentec at contesting.com
> Subject: [TenTec] Omni VI opt 3.... PLL problem
> Message-ID:
> 	<CA+uDY2T6UwvdWZVJO2H-NdqFQoEg0kK-x0Yi_isTLRtXp9e3qQ at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> 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
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 27 Jan 2022 23:28:40 -0500
> From: Jim Goudie <jagoudie at comcast.net>
> To: Ten-Tec List <tentec at contesting.com>
> Subject: Re: [TenTec] Omni VI opt 3.... PLL problem
> Message-ID: <6A62D6A7-7512-46B9-9198-ACF425166CCA at comcast.net>
> Content-Type: text/plain;	charset=utf-8
>
> 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
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 28 Jan 2022 10:22:15 +0100
> From: gerd Groos <df9ts.cw at gmail.com>
> To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
> Subject: Re: [TenTec] Omni VI opt 3.... PLL problem
> Message-ID: <235352E8-B19E-4CDD-975D-AA9454537185 at gmail.com>
> Content-Type: text/plain;	charset=utf-8
>
> 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
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>
>
> ------------------------------
>
> Message: 5
> Date: Fri, 28 Jan 2022 10:23:49 -0500
> From: Jim Goudie <jagoudie at comcast.net>
> To: Ten-Tec List <tentec at contesting.com>
> Subject: Re: [TenTec] Omni VI opt 3.... PLL problem
> Message-ID: <82B248A8-F193-4BBC-98B8-6269A332159C at comcast.net>
> Content-Type: text/plain;	charset=utf-8
>
> 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
>>>> _______________________________________________
>>>> TenTec mailing list
>>>> TenTec at contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/tentec
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>
>
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>
> End of TenTec Digest, Vol 229, Issue 8
> **************************************

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