Hi again,
I forgot to mention this nice piece of software useful to check what you're
doing:
http://www.gb.nrao.edu/~jbrandt/jLSTclock/
Jean-Louis
----- Original Message -----
From: "Jean-Louis Oneto" <jean-louis.on...@obs-azur.fr>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Tuesday, May 17, 2011 12:27 PM
Subject: Re: [time-nuts] Sidereal timekeeping
Hello list,
I tried that a long time ago, but the trap I went into was that the
capacitance of the 'scope probe was pulling the frequency down, so I ended
with a crystal too high in frequency...
I'm not sure that you can control the frequency without significantly
perturbing it. And waiting to check the rate between each tuning step
would take a long time...
Regards,
Jean-Louis
----- Original Message -----
From: "Bruce Griffiths" <bruce.griffi...@xtra.co.nz>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Tuesday, May 17, 2011 1:22 AM
Subject: Re: [time-nuts] Sidereal timekeeping
Jim Lux wrote:
On 5/16/11 2:58 PM, iov...@inwind.it wrote:
Neville,
at present I have not enough skill with micros to solve the problem.
I think I will try modifying a crystal. This would not be that
difficult using
a lapping sheet or the like. And opening the can would be quite easy
using hot
air.
or a fine jeweler's saw or tubing cutter.
As you pointed out, the crystals are cheap, so you can afford to ruin a
few while figuring out how to do it.
(and then, remember us all, when you're a multi-billionaire having
cornered the market on sidereal rate crystals<grin>)
Since the 32 kHz crystal is likely to be a tuning fork form, one merely
needs to shorten the tines to increase the frequency.
It may be feasible to do this without removing any of the electrode
metallization.
Bruce
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