Dear Hideho,
I have some information concerning your question. The following is
from my old 1950 National Association of broadcasters Engineering
Handbook. This is from a section on design of television transmitting
systems.
P2-3-11
SURGE IMPEDANCE - The value is 51.5 ohms for all sizes. The primary
consideration in this choice was the I square R loss, with a slight
compromise on attenuation......
My degrees are in Physics. I very vaguely recall some discussion in an
Electricity and Magnetism class about the two commonly used coaxial
line impedances, 50 & 75 ohm and what situations are appropriate to
their use. However, I cannot find anything explicitly answering your
question, only the above quoted hint.
Sincerely,
Hal Smith
Received on Tue Mar 06 2001 - 23:59:28 EST
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