[time-nuts] Is my Cs C-Field set OK or do I need to take more data?
Brooke Clarke
brooke at pacific.net
Mon Jan 10 02:34:25 UTC 2005
Hi Doug:
Yes. I'll collect more data, but not change anything yet.
Interesting idea about turning off the disciplining. That should give a
straight line, I'll give it a try tomorrow.
Thanks,
Brooke Clarke, N6GCE
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Doug Hogarth wrote:
>Maybe I'm missing something, but I would collect more data and not worry
>about the C-field (frequency offset) at this time.
>I'd focus on the ~80ns peak-to-peak that you saw over 10k seconds vs
>GPS-disciplined Rb.
>That seems too large, so experiment with things like different loop
>constants, verify triggering, consider temporarily turning off the
>displining, etc.
>
>-----Original Message-----
>For the last few days I've been tweaking the C Field setting on a FTS
>4060/S24. Here's some data taken using the 1 PPS output of a GPS
>disciplined Rb oscillator (PRS10) as the "A" trigger input to an SR 620 TI
>counter. The "B" stop input is the 1 MHz output from the Cs source.
>http://www.pacificsites.com/~brooke/pdf/sn1013_C-Field.pdf
>
>
>
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