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.