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" <[email protected]>
To: "Tentec Contesting List" <[email protected]>
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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