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[Zscoundrel]

If I REALLY needed a hyper-accurate time hack, I would build a little 
adapter to monitor the BCD (binary coded decimal) sub carrier  
transmitted with the WWIV short wave broadcasts.  It would decode the 
BCD signal, compute the miniscule time delays cause by the RF travel 
time from Fort Collins to my location, compare it to an internal time 
clock, and then update the  PC via USB or serial port.

Tim Reid wrote:

> Jonathan Hutchins wrote:
>
>> On Wednesday 19 November 2003 08:58 am, Zscoundrel wrote:
>>
>>
>>> On my Red Hat system, I selected Main Menu, System Settings, Date & 
>>> Time
>>> and enabled network time protocol.  This causes the system to stay in
>>> sync with a time server.
>>
>>
>>
>>> I have one of those atomic clock thingys that listen to the WWIV
>>> broadcast and the computer and the atomic clock always stay within a
>>> couple of seconds of each other all the time.
>>
>>
>>
>> If you need something more accurate, within a second, a GPS with a 
>> serial port will give very accurate time for the NTP server.
>>
>>
>>
>>
>>
>
> YMMV, but even GPSr's (GPS receivers) don't always give accurate UTC 
> time.  As I've been told, you have to wait 12+ minutes to recieve the 
> full GPS NAV. message along with the correction for the GPS time 
> difference from UTC.  Then, depending on your GPSr setup, the NEMA 
> sentence received through the serial port is 1-4 seconds later than 
> the time that the GPSr is receiving from the sats.  Basicly, your time 
> difference with the GPSr method may be up to 15-16 seconds of 
> difference from UTC.
>
> read http://gpsinformation.net/main/gpstime.htm for more info.
>
> Then you have to worry about getting a good signal from the geosync. 
> sats. that transmit the GPS signals.  The signals don't penetrate 
> (sp?) concrete walls and other building materials well.
>
> :D  However, attaching a GPSr to your computer is still more accurate 
> than not, so maybe I'm being overly pedantic.  :D
>
>
> Tim
>
>
>
>

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