Re: [time-nuts] Simple GPSDO

Fri, 30 Dec 2011 23:15:59 -0800

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.
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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