Ian Jackson wrote:

In message , Michael A.
Terrell writes

Ian Jackson wrote:

In message , William Sommerwerck
writes
I knew an old ATT guy who worked in both cross country coaxial
& microwave video feeds. He told me how much of a pain it was to
equalize a section of cross county coax used for network TV feeds,
and keep it that way as the temperature changed.

Thanks for the confirmation. I didn't realize coax was so
temperature-sensitive.

Its attenuation changes by appx .02dB per dB per degree C.


At what distance? At what frequency?

Any and any.
Think about it.


I have. Let's say I have a 5000 foot piece of coax and a 5 foot
piece. One is used to 450 MHZ, and the other at 11 GHz. The change is
not the same.

You need a change per distance, and frequency, because each type of
cable has different loss characteristics.


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