[time-nuts] M12M Receiver Disiplining PRS10
SAIDJACK at aol.com
SAIDJACK at aol.com
Sun Sep 24 16:05:29 EDT 2006
Hi there Lee,
I am doing that right now. Attached see an ADEV plot of the PRS10
disciplined by an M12+.
My experience is that:
1) the PRS10 unit I have generates a 1PPS output which is about 35-40ns
too early on average when compared to the 1PPS input from the GPS. I think
this offset can be canceled by sending commands into the PRS10
2) I use a 7-hour averaging time, the PRS10 itself is very good for time
periods shorter than 7 hours except:
3) The unit has a very large 1-2E-011 hump at around 20s time intervalls,
this was discussed in this forum about a month ago. See the PDF file
attached.
4) the PRS10 generates a very short, and weak output pulse on it's 1PPS
output (10us if I remember correctly). That needs to be extended and buffered
in my application.
For the ultimate in Rb performance, I think the best one can do is use a
very good stability cleanup oscillator with a 100s or slower PLL response time
to filter out the annoying noise generated by the PRS10 between 1s to 100s
intervalls. This can be done with an MTI 260 series oscillator for example. In
that case, it's possible to get ADEV stability of about <5E-012 above one
second.
hope this helps,
bye,
Said
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