[time-nuts] Can Lady Heather Keep Computer Clock On Time?

Bob Camp lists at rtty.us
Thu Jul 29 14:13:18 EDT 2010


Hi

My observation is that the displayed clock on LH can be off by > 10 seconds.
That's with the current beta code and Windows 7 on a quad processor machine
or under XP on a dual core machine. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brooke Clarke
Sent: Thursday, July 29, 2010 2:04 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Can Lady Heather Keep Computer Clock On Time?

Hi:

I have a friend who's setting up an observatory and the PC that controls 
the telescope needs to have an accurate clock.
The telescope can point to within arc seconds of a star and that implies 
that the computer clock needs to be within 50 ms.
If he does a Windows NTP sync first thing in the evening after a few 
hours there's too big an error.  Running the observatory is like flying 
a 747, i.e. there's a lot to do and the time needs to be handled 
automatically, not by manual NTP updates.

I know that TAC32 and a Motorola GPS will do this and you have a lot of 
options of how it does it.  For example at a specified time interval or 
when the computer clock differs from GPS by a specified amount of time 
(50 ms in this case).

What are the options in LH?  I ask because it's a lower cost option then 
the Motorola GPS plus TAC32 option or building a NTP time server.

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com



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