Your number one was formerly RG17 A/U a standard heavy duty 50 ohm coax.
Your number two is most likely or even surely a 75 Ohm cableTV. the second
wire is only there to suspend the cable for zero mecanical stress on the
coax. Be aware not to squash it, and respect the bend radius.
Hope this helps Jeff.
73's Jos on4kj
----- Original Message -----
From: "Jeff Stai WK6I" <wk6i@twistedoak.com>
To: <towertalk@contesting.com>
Sent: Thursday, May 29, 2003 6:15 AM
Subject: [TowerTalk] coax ID help
>
> hi - I have two cables to identify and to evaluate whether they are worth
> keeping and using (helping a friend deal with the estate of an SK):
>
> 1. Two rolls of cable marked RG218U, one roll is "Alpha Wire 92194" the
> other is "Plastoid 77314". I gather from Googling that the 218 is a 50ohm
> coax (good) with high dielectric breakdown voltage (11kv). It's nice and
fat
> (0.880", according to the charts), with a solid center conductor and a
solid
> dielectric - however, it has a braided shield and the roll has been
sitting
> out in the elements for an indeterminate time (perhaps years). Is there
any
> chance this stuff is still usable and reliable?
>
> 2. One roll of cable with no markings at all. It appears to be a .500"
> cable, with solid aluminum center conductor, solid dielectric, and
a -solid-
> aluminum shield. The odd thing is that it is 'paired' with what seems to
be
> a steel wire in a single plastic jacket - the steel wire is offset .3-.5"
> from the coax - it kinda looks like twinlead, but one of the leads is on
> steroids...;-) This cable has also been out in the elements for some
length
> of time. Any idea what it is and if it would be useful to someone?
>
> thanks very much for your help! - 73 - jeff wk6i
>
>
>
> --
> Jeff Stai jds@twistedoak.com
> Twisted Oak Winery http://www.twistedoak.com/
> Rocketry Org. of CA http://www.rocstock.org/
> Amateur Radio WK6I
>
>
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>
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>
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