Need trusted NTP Sources

Bryan Seitz seitz at bsd-unix.net
Sat Feb 8 04:35:25 UTC 2014


On Fri, Feb 07, 2014 at 03:32:22PM -0500, Anthony Williams wrote:
> 
>  With a quick and easy mod, another option for $35 is a Sure Electronics
> GPS board.
> 
> GPS: http://www.sureelectronics.net/goods.php?id=99
> 
> Mod: http://www.satsignal.eu/ntp/Sure-GPS.htm
> 
> -Alby
> 
> 
> On 2/7/2014 1:14 PM, Jared Mauch wrote:
> > Having a number of NTP servers will help you detect false tickers which may be critical.
> > 
> > If you want something that is "cheap" as in you for your home, I can recommend this: ~$350 w/ antenna, etc..

The SureGPS is decent fun but i've had this device lose sync / crap out randomly as well.  
I am using the Garmin 18X-LVC + a low power server with pretty good success.

(Requires PPS soldering + USB pigtail for power, pretty easy mod)

[seitz at ntp-gps ~]$ ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 clock.fmt.he.ne .CDMA.           1 u   53   64  377   76.692    0.976   0.291
 time-a.timefreq .ACTS.           1 u   39   64  377   48.140   -0.896   0.348
 time-b.timefreq .ACTS.           1 u   56   64  377   48.800   -0.986   0.430
 time-b.nist.gov .ACTS.           1 u   48   64  377    7.333    3.630   0.562
oGPS_NMEA(1)     .PPS.            0 l    4   16  377    0.000    0.002   0.000

* GPS is on a http://us.shuttle.com/barebone/Models/XS36VL.html - chosen for the dual external serial ports.

-- 
             
Bryan G. Seitz



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