[time-nuts] Simple GPSDO
Charles P. Steinmetz
charles_steinmetz at lavabit.com
Sat Dec 31 07:10:19 UTC 2011
I know the thread began with a request for a "simple" DIY GPSDO, and
this may not be quite as simple as some might like. However, PPS
discipline is generally the simplest and most universal scheme from
the standpoint of interfacing to whatever GPS engine one has
available. The PRS10 has a clever system for PPS disclipine, using
time-tagging for phase detection, that mitigates the usual
shortcomings of PPS discipline and should be suitable for PIC/FPGA
implementation:
Emacs!
As implemented by SRS, the discipline parameters are more than
sufficiently adjustable for any need. For a homebrew version, the
VCO would be the quartz VCXO or Rb of your choice. The pre-filter
(which is selectable in the PRS10) would be a great help in dealing
with the jitter in a GPS PPS signal. PPS locking is discussed at pp.
14-18 of the 2003 and 2005 manuals. (The manuals and Rev. H
schematic are readily available on the web.)
Best regards,
Charles
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