Demian,
the big question is, what are your requirements?
Long term stability, phase noise, ADEV,...?
You'll probably spend a multiple of what a finished product costs to get
the 10811A with a cstom made x-tal on specs. Not to speak of the phase
noise test equipment needed, that will break your bank if you have to
rent it for a couple of weeks...
The easiest way to get 20 MHz out of a 10811A is to double the output
frequency.
The next option would be to phase lock a 20 MHz VCXO to the 10811A.
Obviously, you can also divide a 80 MHz, 100 MHz etc. oscillator down to
20 MHz.
So, the question is, what do you really need?
Adrian
Demian Martin schrieb:
Having seen the note on alternate crystals for the HP10811 oscillator I was
wondering if its realistically possible to re-crystal one to frequencies in
the 20 MHz range? Some other components may need to be changed of course but
is this worthwhile exploring? Who would be a good vendor for a few custom SC
crystals that would work in an HP10811? I have been quoted prices in the
$500+ range for finished products and want to explore a more cost effective
option before I spend a lot of money.
Demian Martin
Product Design Services
San Leandro, CA 94577
209 613 6990
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