On 1/4/2012 2:14 AM, Hal Murray wrote:
I compared the OCXO output to the 10 MHz output of both a Z3801A and a
Tbolt and discovered that the CW-12's 10 MHz output is about 1.5e-11 (i.e.
1.5e-4 Hz) low in frequency. I emailed Navsync and they replied:
"The CW12 Motorola Binary and NMEA versions both do not phase align the
frequency output so the long term drift that Ed is seeing is expected."
Is there a timing version that does the right thing?
Unfortunately, this _is_ the timing version!
Incredible. It's 'steered by the GPS receiver' - that's a direct quote
from the data sheet and the user manual - but it's not quite on frequency
and that's fine with them.
Is it consistently off that much, or does it wander around the right answer?
(perhaps because there is a small dead band in the phase detector)
The frequency error is consistent. Superimposed on that error is the
normal GPS wander that you see with every GPS receiver.
Ed
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