[time-nuts] HP Z3801A, GPS vs UTC?, NTP

David J Taylor david-taylor at blueyonder.co.uk
Sat Jun 11 15:40:55 UTC 2011


> Magnus,
>
> I am interested in UTC time for weather satellite reception,
> synchronising via NTP.  I tried the GPSCON program for the Z3801A but
> could never get it to broadcast ntp information on my LAN.  Recently, I
> have purchased some Sure GPS boards from Sure Electronics
> (http://www.sureelectronics.net/goods.php?id=99).  David Taylor has a
> great page on this at http://satsignal.eu/ntp/Sure-GPS.htm ... but now I
> am thinking his time is maybe always 15 seconds off, yes??
>
> R

Ron,

No, the time is UTC and not GPS, so it's "correct" and not 15s out.  To be 
sure (and as is good practice in any case), do include an Internet server 
or two in your ntp.conf file.  Something like this:

# ref-clock drivers - Sure Electronics GPS board
server	127.127.22.1	minpoll 4
server	127.127.20.1	minpoll 4  mode 18  prefer

# Use specific NTP servers
server	0.uk.pool.ntp.org	minpoll 10
server	1.uk.pool.ntp.org	minpoll 10
server	0.nl.pool.ntp.org	minpoll 10
server	1.nl.pool.ntp.org	minpoll 10

You can use "ntpq -p" to check the offset of the Sure board relative to 
the Internet servers.

Thanks for letting me know that the Web pages were helpful.

73,
David
-- 
SatSignal software - quality software written to your requirements
Web:  http://www.satsignal.eu
Email:  david-taylor at blueyonder.co.uk 




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