The recent supplement to Microwave journal has a piece on phase stability of cables (predictably - written by a vendor of said cables..): http://www.microwavejournal.com/publications/1/editions/223
maybe you can recalculate your results in PPM and plot against temperature, to compare with the mw-journal plots? Anders On Sat, Apr 15, 2017 at 4:34 AM, Mark Sims <[email protected]> wrote: > I finally got around to using a TICC to measure the temperature > coefficient of 100 feet of generic RG-58 coax using a TICC. The TICC was > clocked by a HP 5071A 10 MHz output. The 1PPS output was connected to the > input of the coax and the TICC chB input. The TICC chA input was connected > to the coax output via an inline terminator. The TICC was set to "debug" > mode and Lady Heather plotted the chB-chA timestamp difference (hence the > negative cable delay values). > > The coax had been chilled down for 2 hours in a 5 degrees F in a freezer, > connected to the TICC, and left to warm up in a 75 degree F room. Over > the 10F to 70F temperature range (measured with an IR thermometer) the coax > delay spanned around 300 ps... so figure around 5 ps per degree F (10 ps > per degree C) for 100 feet of cable. > > I'm adding currently adding the ability for Heather to use an external > temperature sensor... > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
