[TenTec] Frequency Misalignment Between VFO A and VFO B

[Ron Castro]

I have the same problem, which is documented on my web site at www.N6IE.com 
.  The receivers are not phase locked even though they use the same master 
oscillator.  The best I can figure is that the DSP runs off a crystal that 
is not exactly on frequency and, unfortunately cannot be tweaked.  Both 
"sides" of the two-channel DSP are operated off the same crystal (not the 
master oscillator), but the scheme may result in a difference of frequencies 
of the two receivers unless the crystal is precisely on the correct 
frequency and that a deviation may cause on receiver to go up in frequency 
and the other to go down.

The result in my O2 is that the main and sub are 6 Hz different on all 
frequencies.

         Ron  N6IE
      www.N6IE.com


----- Original Message ----- 
From: "Kim Elmore" <cw_de_n5op at sbcglobal.net>
To: "Tentec Contesting List" <tentec at contesting.com>
Sent: Monday, February 18, 2008 5:32 AM
Subject: [TenTec] Frequency Misalignment Between VFO A and VFO B


> For some  time, I've noticed what seemed to be a very slight
> frequency misalignment between VFO A and VFO B when in the binaural
> mode (A in one ear and B in the other).
>
> On my O II it's noticeable even in the noise as what sounds like a
> beat note in stereo phasing when both VFOs are tuned to the same
> frequency. Last night, I chased this down and found that VFO B is
> about 6 Hz lower in frequency that VFO A. This isn't a terribly big
> deal, but is there a way to align the two, or are the master
> oscillators different so that the two drift around slightly as a
> matter of course?
>
> Kim Elmore, N5OP
>
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