[time-nuts] Question on crystal jumps
bruce.griffiths at xtra.co.nz
Fri Oct 24 02:36:00 UTC 2008
Steve Rooke wrote:
> 2008/10/24 <SAIDJACK at aol.com>:
>> the jumps are very slow in their frequency change, so the crystal filters
>> would just follow the frequency drift. I have seen these jumps take from a few
>> seconds to 20 minutes or so. Of course in a Rb they would be compensated by
>> the Rb pulling or pushing the crystal onto the proper frequency.
> But I'm not suggesting that the rubidium stage is used to discipline a
> ocxo and then fed onto a xtal lattice filter, I meant that the
> rubidium stage would go directly into the xtal lattice filter. This
> way there is no xtal oscillator to jump off frequency.
You've missed a vital point:
There is no RF output from the rubidium cell itself at all.
It doesn't oscillate as does an active hydrogen maser.
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