[time-nuts] eBay Ublox

[Bill Dailey]

Very nice write up.  I went down a similar road with my fury and Ubuntu... And then with FreeBSD on a soekris box.  Have you tried refclock drivers instead of gpsd?  I use gpsd on Ubuntu but decided to use refclock route instead for FreeBSD.  I have an overall feeling that at us and ns levels gpsd doesn't perform as well... No evidence but is does seem like it should be inherently slower... Probably much more important on the free bsd soekris implementation.

Doc

Sent from my iPad

On Nov 21, 2012, at 2:45 AM, "David J Taylor" <david-taylor at blueyonder.co.uk> wrote:

> -----Original Message----- From: paul swed
> Sent: Tuesday, November 20, 2012 9:34 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] eBay Ublox
> 
> any luck on the ntp server?
> ==========================================
> 
> If it's me you are asking, yes, Paul, here's the server:
> 
> http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html
> 
> and here's the performance with the u-blox NEO-6M (I know that's a Navigation and not a Time GPS).
> 
> http://www.satsignal.eu/mrtg/performance_raspi-1.php
> 
> When recompiling NTP /and/ installing SNMP, there was a +20 microsecond transient, followed by a -14 microsecond transient during recovery.  That was just before 16:00 UTC the day before yesterday, and is just disappearing off the left end of the graph as I write (08:40 UTC, Wednesday).  Otherwise well within 5 microseconds, with the unit just sitting out in the open.
> 
> Cheers,
> 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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