[time-nuts] Some results of PRS10 and Trimble Resolution T
SAIDJACK at aol.com
SAIDJACK at aol.com
Wed Jun 28 18:56:58 EDT 2006
HI Hmurray,
you said:
>One of Said's graphs had a minor bump at roughly 2 seconds. I saw another
>graph with a small spike at 2 seconds, but I don't remember where.
I thought these bumps were rather considerable, at about 1 to 2E-011, about
8 - 10x what our GPS-locked OCXO's do.
>So why does that cause a bump at 2 seconds? Why not 1 second or 5 seconds?
>It seems reasonable to filter out the 5 seconds, but I can't see how to
>filter out 1 second without also filtering out the 2 seconds. I think I'd
>expect a shoulder rather than a bump. It would fall off above 2 seconds
and
>blend in below 2 seconds.
My question exactly. I just talked to someone who uses SRS PRS10 Rb's, and
apparently SRS admitted to him that the <10s ADEV is fairly bad on the PRS10
units (without any details).
It's exactly peaked at 2s, it's got to be something digital like the DAC
control of the OCXO etc. Any SRS designers among this group? BTW: while I cannot
prove it anymore, I am pretty confident the PRS10 did the same thing while
free-running (without 1PPS input).
bye,
Said
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