Now that is obsessive!! :-))
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dr Bruce Griffiths Sent: 12 March 2007 22:39 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Delay through GPS antenna splitter/amplifier -- an answer, and a question Tim Shoppa wrote: > John Ackermann N8UR <[EMAIL PROTECTED]> wrote: > >> But we're time-nuts... we DO worry about those things. :-) >> >> While we were at it with the network analyzer, we did FDR (frequency >> domain reflectometry) to measure the cable delay to the antenna, and >> I spent yesterday making up six matched cables to go from the >> splitter to the receivers -- they all test within about 1 nanosecond of each other. >> >> Obsessive compulsive? Me? >> > > At the lab I worked at in the 80's, all the cables hanging on the > wall-racks were calibrated and labeled in nanoseconds. > > But... after the ECL signals got turned into TTL, we just didn't care > anymore :-). > > Tim. > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > John Your not quite obsessive enough. The cable delays (including the antenna to splitter cable) should also be a multiple of half the signal period to minimise the effects of residual mismatches at either end of the cable. Bruce _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
