[time-nuts] Sidereal timekeeping

Bob Camp lists at rtty.us
Tue May 17 15:52:53 UTC 2011


Hi

And you want to keep both sides of the tuning fork equal length to roughly
one part in 50,000 when you move it 1 part in 365. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Jim Lux
Sent: Tuesday, May 17, 2011 11:09 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] Sidereal timekeeping

On 5/17/11 7:01 AM, Jean-Louis Oneto wrote:
> I realized that there was lot of way to avoid this [pulldown] problem,
> but as I said, it was a long time ago (around 1976...), I was young and
> inexperimented, and I just tried once on an almost broken 5 FF (~$1)
> wristwatch, then I decided that the software approach would be better
> for me.
> I used a fine-grained handheld sharpening stone very carefully and just
> a few light touchs were enough (um, rather too much!).
>

a bit of jeweler's rouge embedded on the end of a pencil eraser or 
wooden stick and a steady hand.

1000 grit lapping paper might be even better, because you wouldn't have 
to worry about the grit remaining on the quartz.

You've got a pretty big move.. one part in 365, right?  It's not like 
moving a 10 MHz crystal up by 1000 Hz.

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