[time-nuts] 10MHz Rubidium reference source for frequency counter
ra3apw at mail.ru
Fri Oct 31 20:57:05 UTC 2014
Thank you, Charles.
All OCXOs have been tested in free-running mode after 40-50 min of
All OCXOs have been installed in isolated close box to exclude external
Cases of all OCXOs had not any contact with external metallic parts of the
>>The next OCXOs have been tested today:
>Did you test the oscillators free-running (NOT in your GPSDO)? If
>so, those plots look much too high (by at least an order of
>magnitude, maybe even 2 or more OOM for some of the oscillators).
>Of course, oscillators take time to settle to their best stability --
>as much as several weeks or even several months for some -- so if you
>just turned them on and measured them a few hours later you can
>expect higher than normal ADEV results. Even so, these results seem high.
>But if you measured them in your GPSDO circuit, you have not
>separated the potential measurement problems from potential GPSDO problems.
>If you suspect the time base in the Pendulum, you can use one of the
>OCXOs to feed its external reference input.
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