[TenTec] Omni 6 5.5 MHz VFO PLL alignment

[Dukes HiFi]

Thanks Clayton. Seems to be a common failure mode.

Gary


> On Dec 11, 2016, at 1:18 PM, Clayton Brantley via TenTec <tentec at contesting.com> wrote:
> 
> Gary:  I have a PLL board from my old 563 that went out to lunch and never came back.  I have not been ableto repair it because I really do not have access to the equipment for testing.  I did try to re-heat all the solder jointsbut that didn't do anything.  Just wondering if you need the board for parts?
> Clayton N4EV
> 
> 
>      From: Dukes HiFi <dukeshifi at comcast.net>
> To: Discussion of Ten-Tec Equipment <tentec at contesting.com> 
> Sent: Saturday, December 10, 2016 10:59 PM
> Subject: Re: [TenTec] Omni 6 5.5 MHz VFO PLL alignment
> 
> Actually the synthesizer in this radio is pretty simple by synthesizer standards.
> 
> It is also rather ingenious. 
> 
> I have found that the CPU puts more of these in the parts bin than synthesizer issues. 
> 
> But, we all have different experiences. For me, I’d rather wrestle an opponent I can beat (a PLL  synthesizer) than one I cannot (a CPU with proprietary chips you can no longer get at any price).
> 
> 73
> 
> Gary
> 
> 
>> On Dec 10, 2016, at 12:56 PM, Steve Ellington <steven4lq at gmail.com> wrote:
>> 
>> Good luck. PLL problems are the reason so many Omni VI's get sold for
>> parts. :*)
>> 
>> On Sat, Dec 10, 2016 at 1:15 PM, Dukes HiFi <dukeshifi at comcast.net> wrote:
>> 
>>> I did find the Omni 5 process that Barry had referenced but this only
>>> covers centering of the VCO.
>>> 
>>> I need to do the loop IF alignment.
>>> 
>>> There is a rectifying test point at the output of this stage and I assume
>>> that there are adjustments to be made at differing frequencies using the DC
>>> voltage developed at this test point in order to get proper gain across the
>>> entire required bandpass of the VCO.
>>> 
>>> That’s the process I need.
>>> 
>>> Thanks,
>>> 
>>> Gary
>>> 
>>> 
>>>> On Dec 10, 2016, at 12:07 PM, Dukes HiFi <dukeshifi at comcast.net> wrote:
>>>> 
>>>> Now that I have repaired the PLL on the 5.5 mHz board of this Omni 6+ I
>>> am repairing, I need to align the loop IF amplifier and VCO centering.
>>>> 
>>>> Is there a resource where I can find this process?
>>>> 
>>>> Gary
>>>> 
>>>> W0DVN
>>> 
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