[ntp:questions] Re: Question to NTP developers

David J Taylor david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk
Thu Aug 24 15:19:51 UTC 2006

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.


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