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non magnetic coax

B

Bob

Jan 1, 1970
0
Slightly off-topic: another friend pointed out an interesting
property of RG-174/U -- the type with the center conductor of copper-
clad steel strands. Most coax shows attenuation (in dB/unit length)
proportional to the square root of operating frequency, at least where
the frequency is high enough that skin depth is smaller than the
thickness of the conductors and low enough that dielectric loss isn't
significant. But because the copper on the center conductor of the
RG-174 is so thin, about a mil, and because skin depth in the magnetic
steel core is extremely small, the copper loss--and therefore the
attenuation--is nearly constant over a range of frequencies up to
roughly 10MHz. This can occasionally be an advantage.

Cheers,
Tom

Interesting, I imagine this is makes RG-174U good for composite
video such as the output of an analog CCTV camera.
CCTV monitors have AGC so it dosn't matter if all of a video
signal is attenuated a bit but if the high frequencys are reduced
more than the low frequencys the picture becomes less sharp.

Bob
 
sorry, I meant to write 7805, but it has 50 Ohm
and an additional shielding foil.

"sorry, I meant to write 7805, but it has 50 Ohm
and an additional shielding foil."

Ahh, no wonder I couldn't find it anywhere. Thanks for the
correction.

George
 
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