[time-nuts] Next step up from basic GPS/PPS timekeeping

[David J Taylor]

I currently operate a stratum 1 NTP server in the NTP pool using a U-Blox 
Max-7Q GPS module with PPS attached to, variously, a Raspberry Pi via GPIO 
or a Celeron mini PC via serial DB-9. The machine does nothing but serve 
time to the pool. Operating systems of choice are Debian or FreeBSD.

What would be my next step up be, hardware-wise, in terms of improving 
precision, stability, etc? A GPSDO? Budget is limited as far as these things 
go - about £150 UK/$210 US.

I appreciate this is basic stuff compared to the usual discussions but this 
doesn't seem the right question to ask on the NTP lists. Any help 
appreciated. Thanks.
_______________________________________________

Neil,

A BeagleBone Black might give half the jitter compared to the RPi, but not 
the order of magnitude you may be seeking.

  http://www.satsignal.eu/ntp/BBB-vs-RPi.html

Perhaps purely for serving the pool, the RPi is more than adequate.

Cheers,
David
-- 
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Email: david-taylor at blueyonder.co.uk
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