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Re: [TowerTalk] Coax, solid center

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Coax, solid center
From: Jan Erik Holm <sm2ekm@telia.com>
Date: Mon, 01 Mar 2004 17:04:51 +0100
List-post: <mailto:towertalk@contesting.com>
RG217 is good for rotor loops, rated about 1000W at 144 MHz,
much much more on HF. You can get both N and DIN 7/16 connectors
for it, PL259 (solder type) connectors can also be fitted.

73 Jim SM2EKM
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K7LXC@aol.com wrote:
In a message dated 3/1/04 4:35:34 AM Pacific Standard Time, Kingsautomotive1@alltel.net writes:


I am installing a beam or two, and have only coax with solid center.
(Belden 9913, etc.) Has any one used this successfully for the flexing

part?


Maybe a large, carefully supported loop? I have heard of using 1/2 "
corrugated hardline, so maybe it can hold up without breaking where the

mast


rotates. I would like to hear of anyone's experience here.


No one recommends using 9913 or any solid centered coax where it has to move occasionally; i.e. rotation loop. Besides the center conductor moving around inside the air dielectric, the solid center conductor will work eventually work harden and crack - bad news for any feedline. Terminate the 9913 at the top of the tower and use any old stranded center conductor coax to the beam.

Cheers,
Steve K7LXC
TOWER TECH




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