[time-nuts] Ublox GPS board

[Ulrich Bangert]

John,

in a lot of cases such "accuracy" specs are specified (without being
explicitely mentioned) for ONE sigma of the statistical distribution of the
pulses. In your case this would mean that 66% of the pulses are within +/-
50 ns and 99% of the pulses are within +/- 150 ns. These numbers apply
exactly only to normal distributed values but in any case give you an idea
of what you may expect.

Best regards
Ulrich Bangert 

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von John Green
> Gesendet: Montag, 20. Dezember 2010 17:03
> An: time-nuts at febo.com
> Betreff: [time-nuts] Ublox GPS board
> 
> 
> I recently bought 4 older UBLOX GPS boards on eBay for $15 
> with free shipping. I hooked one up to my 1992 and comparing 
> it with the Z3801, I am seeing it jump all over the place. I 
> am using the 10 MHz output from the 3801 to start and the 1 
> PPS from the UBLOX to stop. I will have to bring in a TBolt 
> just to verify the test set up. Has anyone here ever made any 
> measurements on the UBLOX TIM-LF-0-000? These are not timing 
> grade, by the way. The spec. sheet says the accuracy of the 
> time pulse is 50 nSec. If that is +/- 50, then what I am 
> seeing might be OK.
> 
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