I hate to be a salesman, but the "FatPPS" board that I designed and that TAPR is selling (http://www.tapr.org/kits_fatpps.html) is intended to solve this very problem. It will take a very short input pulse and stretch it out to at least 25 milliseconds, which should be enough for any serial port.
John ---- Ana Hernandez said the following on 01/15/2007 11:34 AM: > Hi Rob, > > I read your mail, and I have a problem about you said, I have a node > with a GPS Garmin, the signal of pps that I receive is very short, so I > can not to synchronize the node. > > remote refid st t when poll reach delay offset > jitter > ============================================================================== > 127.127.28.0 .SHM. 0 l - 64 0 0.000 0.000 > 4000.00 > +193.224.70.7 195.111.99.186 2 u 300 512 377 25.619 1.349 > 0.087 > *130.206.169.218 .SHM. 1 u 239 512 377 40.112 1.271 > 0.085 > > The pulses are too short for transmission via RS232. I try to lengthen > them, > > /bin/echo -ne "\n\$PGRMC,,$ALTITUDE,,,,,,,,3,,2,48,\n\n" > $GPSDEVICE > > but I can not get to lengthen the pulses, you think that is posible the > problem is in the wire? > > _______________________________________________ > timekeepers mailing list > [email protected] > https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers > > _______________________________________________ timekeepers mailing list [email protected] https://fortytwo.ch/mailman/cgi-bin/listinfo/timekeepers
