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

Tim Shoppa tshoppa at gmail.com
Wed Feb 24 11:34:09 EST 2016


GPSDO's are very nice if you want a bench source for calibration purposes.

On the subject of NTP servers... GPSDO's would be relevant when doing
holdover through a GPS outage measured in days.

My opinion if you want to serve reliable time through a longer GPS outage:
add a WWV or WWVB based radio clock. e.g. a shortwave radio and
https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver36.html

Tim N3QE

On Wed, Feb 24, 2016 at 9:22 AM, Neil Green <ncguk at hotmail.co.uk> wrote:

> 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.
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