[time-nuts] Holdover

Bob Stewart bob at evoria.net
Tue Aug 16 17:48:11 EDT 2016


Hi Attila,
said "Ie you need to figure out what you want to do with those PPS, then figure out what the desired behaviour during hold-over and recovery is and from that you can design the frequency standard."
What is the most usual method for *time standards*?  I'm satisfied with how my unit works as a frequency standard.
Bob
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      From: Attila Kinali <attila at kinali.ch>
 To: Bob Stewart <bob at evoria.net> 
Cc: Discussion of Precise Time and Frequency Measurement <time-nuts at febo.com>
 Sent: Tuesday, August 16, 2016 4:37 PM
 Subject: Re: [time-nuts] Holdover
   
On Tue, 16 Aug 2016 21:31:17 +0000 (UTC)
Bob Stewart <bob at evoria.net> wrote:

> So, that's one way, but probably not a desirable way.  My interest was in 
> the option of using the OCXO to create the time, which clearly gives a 
> better option when the receiver syncs back up to the sats.  Is there a 
> published standard for this, or is this something that everyone (except the 
> newbie) knows so well that it's not worth discussing?

No, there is no standard[1]. A system like this is always tailored to
the consumer of the PPS pulses and its requirements. Ie you need to
figure out what you want to do with those PPS, then figure out what
the desired behaviour during hold-over and recovery is and from that
you can design the frequency standard.

            Attila Kinali 


[1] https://m.xkcd.com/927/

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