The early limits on television picture quality

[ppppenguin]

The study of co-ax cable impedances is repeated in various places such as:
https://www.belden.com/blog/broadcast/50...-impedance
I think the original publication was in a US patent rather than Bell System Technical Journal.

While browsing my volumes of BSTJ I chanced on the origin of the decibel (and neper). it was abbreviated as db then, dB now. See scans attached.