[Apologies if I've messed up this reply - my first posting to timenuts as a
new nutlet]
See performance plots, data files, and summary at
http://www.ke5fx.com/gpscomp.htm . Thanks to Bob, W7AVK for the loan of
the unit for testing! Would be curious to know if anyone else has
encountered a similar frequency error, or if the issue I saw was unique to
this particular example.
In looking through the ublox Timing Appnote on the ublox 6 GPS receivers:
https://www.u-blox.com/images/downloads/Product_Docs/Timing_AppNote_%28GPS.G6-X-11007%29.pdf
aside from possible sources of error from antenna cable delay and multipath
it also refers to quantization error of the timing pulse itself.
Is it possible that this also has a systematic offset or is this just
contributing to the observed noise level around the mean? Being new to the
concept of GPSDOs I have no idea how much these intrinsic errors in the GPS
receiver itself bleed through to the performance of the output frequency
from the OCXO - or is it all masked by the long time constants and filtering
in the Software PLL loop?
-willis
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