[time-nuts] Sidereal timekeeping

[Robert LaJeunesse]

Hence the advantage of your frequency counter's period averaging mode. Don't 
measure the crystal, measure the divider it is connected to. That way loading 
effects are not directly on the crystal.

Bob LaJeunesse



________________________________
From: Jean-Louis Oneto <Jean-Louis.Oneto at obs-azur.fr>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Tue, May 17, 2011 8:27:14 AM
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