The cables are not exactly the same lengths. Differences in length will result in a fixed offset. I am not concerned about such fixed errors, only jitter.
I am comparing the rising edges which is what the spec defines as the reference edge. Pete. -----Original Message----- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: Saturday, September 13, 2014 6:12 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Correcting jitter on the 1 PPS signal from a GPSreceiver. On Sat, Sep 13, 2014 at 1:33 PM, Bob Camp <kb...@n1k.org> wrote: > Hi > > Have they both completed a survey and does the survey make sense? Are all of the cables the same length? That includes the cables from antenna to receiver and the cable carrying the 1PPS from the receiver to where you are measuring. And also are you SURE you are measuring the correct end of the pulse, you want the raising edge. It is easy to invert the pulse and therefore measure the falling edge. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
