Good point! It is only an issue when you try to calibrate/correlate to the physical length. Didier
On August 11, 2016 1:56:09 PM CDT, Bob Stewart <b...@evoria.net> wrote: >Why is velocity factor an issue? Aren't we only interested in the >electrical time from one end of the coax to the other? >Bob > ----------------------------------------------------------------- >AE6RV.com > >GFS GPSDO list: >groups.yahoo.com/neo/groups/GFS-GPSDOs/info > > From: Didier Juges <shali...@gmail.com> >To: Bob Albert <bob91...@yahoo.com>; Discussion of precise time and >frequency measurement <time-nuts@febo.com> > Sent: Thursday, August 11, 2016 1:20 PM >Subject: Re: [time-nuts] Safely getting the electrical length of a >connected antenna feedline > >I used the PPS from a Thunderbolt (fast rise lime, low rep frequency, >was handy) and a digital storage scope and a couple of resistors to >make a reflectometer based on this experiment: > >www.ko4bb.com/getsimple/index.php?I'd=coax-cable-impedance-matching > >You can very clearly see a 50 ohm/75 ohm mismatch. > >The biggest variable will be the velocity factor. > >Didier KO4BB > > >_______________________________________________ >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. -- Sent from my Moto-X wireless tracker while I do other things. _______________________________________________ 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.