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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