Topband: Using RG-6 for 160m transmission purposes

[Kevin McGuirt]

One caveat - the RG-6 that is so plentiful and cheap these days has a
steel center-conductor with copper plating.  This does not matter at
VHF/UHF where CATV stuff is carried due to the skin effect.  However, I
have been warned against using this stuff for CCTV, where the composite
video is at a much lower frequency.  I suspect that the skin effect
doesn't kick in with 160M RF enough for this stuff to be useful, but I
could be wrong.  Also, I would be concerned about how much power RG-6
could carry.

73 & Good Luck,
Kevin
W4KBM


-----Original Message-----
From: topband-bounces at contesting.com
[mailto:topband-bounces at contesting.com] On Behalf Of Steve Ireland
Sent: Wednesday, July 02, 2003 5:03 AM
To: topband at contesting.com
Subject: Topband: Using RG-6 for 160m transmission purposes

G'day

Down here in Western Australia, RG-11A 75 ohm cable seems virtually
unobtainable these days - and VERY expensive on the rare occasions when
you
can get it.  However, RG-6 75 ohm triple- or quad-screened cable is
cheap
and easy to come across, thanks to the growing number of cable TV
installations.

As a result, I am considering using RG-6 of this kind for an
transmitting
antenna project, but would like to know about:

1. Its (typical) velocity factor (have you every tried asking a TV cable
supplier what the velocity factor of a particular TV cable is?...)

2. What sort of power it can typically handle (the cable may have to
handle
something of a mismatch).

Any information direct to me would be much appreciated.

Vy 73,

Steve, VK6VZ 

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