[TenTec] Omni 6 5.5 MHz VFO PLL alignment
dukeshifi at comcast.net
Sat Dec 10 22:59:57 EST 2016
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).
> 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.
>>> 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?
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>> TenTec at contesting.com
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