[time-nuts] Navsync CW-12 GPS Board - I don't believe it!!

[Hal Murray]

> 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?

> 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)


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