[time-nuts] Best GPS 1PPS Accuracy

[Randy Warner]

Brian,

I would not expect 250ns to cause any problems. The data I was talking
about yesterday was pretty old and S/A WAS on at that time which made it
much harder to keep the 1PPS accurate. I would hope that the firmware in
the receivers has been improved too.


Randy 

________________________________________________________________________
________________________________________

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brian Kirby
Sent: Thursday, December 14, 2006 5:16 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Best GPS 1PPS Accuracy

I use TAC32 Plus with my Motorola M12+ receiver.  You can set TRAIM
between 250 to 1000 nanoseconds.  Default is 500 nS.  I have had mine
set at 250 nS for years and have not noticed any problems - but, that is
a somewhat wide window.

Brian N4FMN

Randy Warner wrote:
> Said,
>
> Based on what I have read from the Motorola side of things setting the

> limits down that low will be problematic due to the constant threat of

> spurious alarms. My concern would be that the "good" 1PPS time 
> accuracies might suffer if the receiver is constantly cycling. If the 
> software filters are not allowed to settle out between alarms and 
> tossing SVs out of the solution you might get all sorts of erroneous 
> stuff. I guess it would ultimately come down to how the receiver 
> firmware was written.
>
>
> Randy
>
> ______________________________________________________________________
> __
> _______________
>
> Hi guys,
>  
> "enough RAM" is a keyword here! Doing outlier detection using  i.e.
> median filters etc seems prudent...
>  
> Part of my question was if anyone had any experience with setting the 
> TRAIM limits really tight, to say +-20 or +-50ns and let TRAIM do the 
> work. I rather  have no pulses than bad pulses.
>  
> Thanks,
> Said
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