[time-nuts] PRS-45 Cs Standard

Bob Stewart bob at evoria.net
Mon Dec 1 12:27:28 EST 2014

Hi Paul,
Well, he's offering a 1 year guarantee, so I suppose that means this is a 9 year old unit.  Fair enough, I guess.  Hopefully I'll finally be able to get a handle on where my GPSDO development stands without having to wonder about the GPSDO I'm testing against.
The document I have says that it uses redundant external power sources.  I take that to mean that I can safely supply only one side and be fine?

      From: Poul-Henning Kamp <phk at phk.freebsd.dk>
 To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com> 
 Sent: Monday, December 1, 2014 11:15 AM
 Subject: Re: [time-nuts] PRS-45 Cs Standard
In message <1290866031.3259250.1417452840614.JavaMail.yahoo at jws10610.mail.bf1.y
ahoo.com>, Bob Stewart writes:

>I've just won a "Symmetricom / Datum PRS45A PRS45-0001K - Single
>Cesium PRS-45 DS1" on ebay from a guy in the Netherlands.

As far as I know it is the cheapest Cs ever produced and it is
specifically targeted at telecoms where no GPS signal is, can
or will be made available.

It's main advantage over rubidium is the lack of drift, so you can
mount it, power it, push the button and as long as the light is lit
(10 years guaranteed) you have a good sync clock for your telco

Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG        | TCP/IP since RFC 956
FreeBSD committer      | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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