I have a 10.23 MHz 10811 oscillator out of an early GPS simulator somewhere, so, FWIW, HP did make at least one. I remember it because I was disappointed it was not 10.000 or 10.24 MHz.
Best, -John ================= > Several issues here: > > 1. Making a precision crystal like the 10811 one is very involved. > It cannot simply be rescaled to a different frequency. It represents > a whole new design. This is not like ordering custom crystals for > your 2 way radio (back in the day). > > 2. The 10.23 MHz crystals I am going to give away (as time permits :-) > were designed under duress by the crystal designers who did not want > any part of the operation. That's why I have a box of the crystals, > since the project died. Expect a similar "welcome" from crystal vendors. > > 3. Many years ago, it may have made sense to have 10.23 MHz GPS > time base oscillators. Nowaways, it is much easier to synthesize > frequencies and you don't see this any more. Everthing starts with 10 > MHz. > > 4. If you need 20.0000 MHz, then use a doubler as others have noted. > If you need some "random" frequency, use frequency synthesis. > > 5. The 10811 crystal is in a custom can, and you would have to kluge > in any different crystal package. This would probably screw up the > oven gain, necessitating rebalancing the heater transistors. > > Summary: (to use a technical term:) fuggedaboudit > > Rick Karlquist N6RK > > On 11/21/2010 10:32 AM, Demian Martin wrote: >> 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 >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
