Bruce,
Are we getting a bit off track? The question I asked is in regards to the Cs,
not the purity of the output of the GPSDO. The two ADEVs were done under the
same conditions, yet the ADEV of the Cs is obviously not as good as that of the
GPSDO. Also, the ADEV of the GPSDO pretty much tracks what is to be expected
when run on a good 5370, isn't it?
Bob
From: Bruce Griffiths <[email protected]>
To: Bob Stewart <[email protected]>; Discussion of precise time and frequency
measurement <[email protected]>
Sent: Saturday, March 4, 2017 5:22 PM
Subject: Re: [time-nuts] Cs standard stability
BobThe Phase noise of that GPDSO seems quite high and some form of filtering
(bandpass or low pass) of its output may be necessary to reduce the resultant
jitter when connected to the 5370A input.There are commercial TDCs that claim
that sort of performance (~10ps) but a comprehensive test of their actual
performance appears as yet unavailable.HP used to sell a TDC with 5ps
resolution but detailed specs are unavailable.Higher resolution and lower noise
should be achievable but would require a lot of number crunching for each
measurement. Bruce
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