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.
--
Ian