[time-nuts] Sidereal time

J. Forster jfor at quik.com
Fri Jan 15 17:27:39 UTC 2010


The external input triggers logic (via a selectable divider). It would
easily go +/- 50% in frequency.

Artek Media has the manual.


-John

=============


> Hi
>
> There may be a gotcha.
>
> If that HP box has their standard time base in it, your idea isn't going
> to
> work. The normal HP approach is to lock a local oscillator up to the
> incoming reference input. That way they can handle a bunch of different
> time
> base inputs without much bother. Their standard VCXO does not have enough
> range to lock to a reference 0.03% off frequency.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Brian Kirby
> Sent: Thursday, January 14, 2010 10:13 PM
> To: precise time
> Subject: [time-nuts] Sidereal time
>
> I would like to have an electronic clock to keep sidereal time.  I am
> planning on using a HP 59309A, which can except an external clock of
> 1/5/10 Mhz.
>
> According to Wikipedia sidereal time is 23 hours 56 minutes and 4.091
> seconds - a total of 86,164.091 seconds
>
> So 86,400 seconds for a normal "atomic defined" day divided by
> 86,164.091 = 1.002,737,903,89
>
> If I set the 59309A to 10 Mhz external clock and dial a synthesizer up
> to 10.0273790, the unit should be able to keep sidereal time.
>
> Is my math and theory correct ?
>
> Brian - KD4FM
>
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