Most of these foam filled cables have a velocity factor in the 80 to 85%
range. You can do a rough calculation based on that, the center conductor o.d.
and outer conductor i.d. to approximate the characteristic impedance.
73,
Gerald K5GW
In a message dated 9/12/2008 2:38:17 P.M. Central Daylight Time,
ab7r@cablespeed.com writes:
Looking for some assistance identifying some cable. The only writing on the
jacket
is 1996 COMMSCOPE.
It's about 7/8 diameter, copper center conducter, a fairly stiff foam (I
think)
dialectric and a full aluminum shielding (not braid).
I called Commscope and at first the tech thought it would be 50-ohm cable
but all
their 50-ohm stuff with the above characteristics has more writting on the
jacket.
So he thinks its probably more likely to be CATV cable at 75-Ohms. Probably
has a
loss of about 1.8-2 dB per 100ft at 2000 MHz. That's gotta be pretty low
for HF/6M!
Anyone out there familiar with this cable? I have a run of about 150-ft
from my
shack to my tower and wondering if it is worth it to replace the buryflex I
have in
there now with this stuff. I have 2 runs from shack to tower.
I'll probably get the cable pretty cheap...maybe about $25 for a couple
large
spools but each only has maybe 150-200 ft on it. New N connectors will cost
me
about $40 each. Then adapters from N to UHF.
The cable is pretty old....1996 but has been unused and on its original
wooden
spool and stored outside.
-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065
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