[ntp:questions] Re: Question to NTP developers

John Ackermann N8UR jra at febo.com
Thu Aug 24 15:35:05 UTC 2006

David J Taylor wrote:
> John Ackermann N8UR wrote:
>> Hal Murray wrote:
>>>> There is only one GPS receiver and, of course, one PPS hardware
>>>> signal. How could the PPS signal be present on one server and
>>>> absent on the other in the same time ? This is my problem and I
>>>> suspect 50% the hardware on the motherboards and 50% the software
>>>> (OS + NTP) !
>> What is the PPS pulse width coming out of the GPS?  A pulse that's too
>> narrow won't be seen by the PC serial port hardware/software.
> []
>> John
> The GPS18 LVC pulse is 100 ms by default, although it can be programmed 
> from 20 ms to 980 ms.

That should be more than long enough.  So much for that theory...


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