________________________________
From: Bruce Griffiths <[EMAIL PROTECTED]>
To: Discussion of precise time and frequency measurement <[email protected]>
Sent: Monday, December 1, 2008 5:26:38 PM
Subject: Re: [time-nuts] time-nuts Digest, Vol 53, Issue 8
Guess that would be the case of too good to believe performance unless the lock
was intermittent and was not recognized. Guessing that the phase comparison
equipment should be fairly equal in precision and accuracy as well, maybe a
rapid switch of the measuring by only one device would help the equal part if
the sample and recording could be rapid enough. Otherwise some type of rotation
to qualify differences in the measuring equipment. Or as I suspect most use
better precision and accuracy in the testing equipment than the DUT, once you
reach the upper limit of better measurement then use the N cornered hat to cull
the bad ones and id the good ones.
Stanley
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>
> I have several 10811's just don't know how good they are yet ...
>
>
If you have 3 or more then you could use the 3 (or N) cornered hat
technique to identify the best of them.
However this requires a significant amount of phase comparison equipment
and adequate isolation between all the OCXOs.
Its all too easy to have one or more of the oscillators injection lock
if the OCXO buffer reverse isolation is inadequate.
Bruce
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