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

Eric Garner garnere at gmail.com
Thu Jul 29 19:26:22 UTC 2010


see the section of the article "Configuring the Windows Time service
to use an external time source" that details how to reconfigure the
winXP time sync service so that it polls and external server for time
at a specified interval.

On Thu, Jul 29, 2010 at 12:10 PM, Brooke Clarke <brooke at pacific.net> wrote:
> Hi Eric:
>
> That seems to be for a time server.  He is just using an ordinary PC and NTP
> to set it's time.
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
>
>
> Eric Garner wrote:
>>
>> with the assumption that he seems to be fine right after a sync,
>> (seemingly supported in the OP) reconfiguring the windows time service
>> to update frequently seems  to me to be the easiest answer.
>> under xp you can do so thus:
>> http://support.microsoft.com/kb/314054
>>
>> _eric
>>
>>
>> On Thu, Jul 29, 2010 at 11:13 AM, Bob Camp<lists at rtty.us>  wrote:
>>
>>>
>>> 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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>>>
>>>
>>>
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>>
>>
>>
>
>
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-- 
--Eric
_________________________________________
Eric Garner



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