[time-nuts] Sidereal timekeeping
iovane at inwind.it
iovane at inwind.it
Sun May 15 22:01:54 UTC 2011
jimlux at earthlink.net wrote:
>On 5/15/11 2:22 PM, iovane at inwind.it wrote:
>> Hi all,
>> does anybody out there have any ideas as where to find a 32859Hz crystal
(1/2
>> that value would be better) to be used to replace 32768 crystals in
ordinary
>> clocks? I think that 32768 crystals cannot be dragged that much. I've
already
>> read the JimLux article somewhere on the web, but I would be pleased
finding a
>> simpler solution. Also, I already have computer programs that show sidereal
>> time.
>> Thanks,
>> Antonio I8IOV
>>
>
>Heh.. I cheated and used a 3325B to make whatever frequency we wanted.
>(even better, you can use GPIB to change the frequency vs time to make a
>"clock" that displays unusual things like "height above horizon" or
>"azimuth to orbiter") Whether this would be more useful than just
>driving a dial with a stepper motor is sort of a good question.
If a 32859 crystal was easily available, that would be a fantastic solution.
>I think you're right that you can't drag a 32768 crystal down by one
>part in 365. Maybe you could do it by opening the can and putting some
>mass on the crystal resonator?
Some mass should be removed, not added. I was considering this possibility.
They exist some so called "tuning fork" crystals that might allow for this.
And
they are very cheap. One could buy a batch of them for a few $ and have a
try.
What do you think?
Antonio I8IOV
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