[time-nuts] Measuring coax temperature coefficient with a TICC
anders.e.e.wallin at gmail.com
Tue Apr 18 10:36:26 EDT 2017
The recent supplement to Microwave journal has a piece on phase stability
of cables (predictably - written by a vendor of said cables..):
maybe you can recalculate your results in PPM and plot against temperature,
to compare with the mw-journal plots?
On Sat, Apr 15, 2017 at 4:34 AM, Mark Sims <holrum at hotmail.com> 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...
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