[ntp:questions] Using Trimble TSIP under Linux
martin.burnicki at meinberg.de
Wed Oct 31 11:08:16 UTC 2012
> David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
> You need to add a circuit to stretch the narrow pulse into a 100ms
> pulse. The exact duration is not important. Just arrange for a
> monostable multivibrator that gets triggered by the rising edge
> of the pulse and extends the pulse by R/C time. Make sure the pulse
> is shorter than 500ms or the autodetection logic will focus on the
> wrong edge of the pulse.
Do you really believe you get true microsecond accuracy out of a PPS
signal if the PPS input circuit detects the PPS slope only if the length
of the pulse is 100 ms or more?
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