[time-nuts] Accurate 1 pps signals

Bob Camp lists at cq.nu
Tue Aug 18 23:11:49 UTC 2009


Hi

Depending on your antenna location(s) and GPS receivers, that's in the  
good to very good range.

Bob


On Aug 18, 2009, at 3:29 PM, Martyn Smith wrote:

> Hello,
>
> I am trying to achieve accuracy with two frequency standards  
> disciplined to GPS.
>
> I am trying to get their 1 pps outputs close to each other as  
> possible.
>
> The idea being you put each unit in a different part of the world  
> and the 1 pps outputs are sycronised.
>
> So far I have two units (GPS10RBN) on their own antennas.  The  
> antennas are seeing slightly different parts of the sky.  The  
> antennas have different length cables but I have equalised the  
> delays by entering a GPS delay into one of the GPS receivers inside  
> the GPS10RBN.
>
> I plot the rising edge of the 1 pp signals (derived directly from  
> the rubidium) using my SR620 in time interval mode.  The sample time  
> is 1 second?
>
> My results are that they are within plus/minus 8.5 ns.  This is over  
> a 24 hour period.  I'm sure they will still this close, I just  
> haven't had enough time to make longer measurements.
>
> This is a peak to peak measurment with no sampling.
>
> Does anyone know a way of getting better results?  My target is  
> actually 10 ns, so I am meeting that, but just wondered what anyone  
> else has achieved.
>
> Regards
>
> Martyn
>
>
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