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Re: [TowerTalk] 75 OHM cable

To: "Tower Talk List" <towertalk@contesting.com>
Subject: Re: [TowerTalk] 75 OHM cable
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 05 Jan 2009 15:55:21 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Mon, 5 Jan 2009 15:47:19 -0800, Steve Katz wrote:

>It's great stuff but requires the use of crimp connectors.  You 
can't solder to the aluminum braid conductors.

>This is the "pole to pole" cable that most cable TV service 
providers use if they are not using 75 Ohm hardline.  It's also 
often used in rural residential drops, where the run is too long for 
RG6 cables (too lossy).  It's very strong, since it has to support 
itself on spans of hundreds of feet between poles, even when covered 
with ice.  It has a messenger cable molded into it, and the coax 
"hangs" from the messenger; this particular cable has a .109" steel 
messenger that can support 1800 lbs!

>Nothing wrong with this cable at all, other than it's kind of 
"stiff" and you need to use crimp connectors.

>I've used it plenty of times.

How much power you can run with this may depend on the composition 
of the shield and the frequency. I'd certainly feel fine with it at 
100 watts, probably more. The dielectric may also be an issue. 
Remember that these cables are designed for very low loss at 
UHF/VHF, but not to handle voltage. 

73,

Jim K9YC


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