[ntp:questions] GPS_NEMA, but high offset and jitter?
snews at lordynet.org
Sat Feb 27 10:57:49 UTC 2010
David J Taylor wrote:
> "David Lord" <snews at lordynet.org> wrote in message
> news:7ur6r2Fac0U1 at mid.individual.net...
>> Thing is there appears to be a problem with the PPS so
>> I was suggesting a more sensitive circuit should a scope
>> or moving coil meter not be available.
> Isn't there software for the OS which emulates a breakout box and would
> give a simple indication of the DCD line or parallel port bit used?
> Obviously you may not be able to use such software at the same time as
> NTP, but it might be enough as a a test tool.
> For Windows, I could find:
> although I've not used any of these, and some require two serial ports.
I mentioned radioclkd(2) both of which in debug mode
display state of selected pin (dcd cts dsr or rng).
radioclkd -s poll -d -v ttyS00:dcd
This gives time at each pulse edge.
I'm sure there are other programs that do a better job
for debugging serial data.
For serial data on Windows, I've captured serial output
by using second serial port and a two headed (9pin + 25pin
at both ends) modem cable that splits the cable for you.
More information about the questions