On 04/03/2011 11:52 PM, Joseph Gray wrote:
That's an interesting question. Does temperature have an effect on the
dielectric that changes the VOP? I'll have to try your experiment. Is
that worth ten extra credit points? :-)
The copper in the coax has a positive temperature coefficient, which
will contribute to an increased impedance (assuming the reactive
components don't change). But, does the impedance have any effect on
VOP? A quick Google search didn't find any information on this. AFAIK
VOP is due to the dielectric properties.
Yes, and the dielectric properties change with temperature and hence
will the speed of the signals. Blow bubbles in the dielectric and the
speed goes up and dependence of temperature goes down.
Same thing happens with fibre. As I recall it about 1/10 of the shift
was due to becoming longer from heat and the rest from the dielectric.
Cheers,
Magnus
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