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RE: [TowerTalk] Cable TV hardline question

To: "David Robbins K1TTT" <k1ttt@arrl.net>,"'Marc Wullaert'" <marc.wullaert3@pandora.be>,"'Tim Holmes'" <W8TAH@Zoominternet.net>, <TowerTalk@contesting.com>
Subject: RE: [TowerTalk] Cable TV hardline question
From: Pete Smith <n4zr@contesting.com>
Date: Fri, 29 Oct 2004 08:29:42 -0400
List-post: <mailto:towertalk@contesting.com>
The calculated losses, using TLW, show why Dave's right. For 300 feet of 1/2 inch hardline at 432 MHz, with 50 ohm antenna and source, the apparent SWR will be 1.25:1, and there will be 6.567 dB of loss in the feedline, of which .768 dB will be due to the mismatch. For 100 feet, the SWR will be 1.74:1, with 2.4 dB of loss, of which .5 dB will be due to the mismatch.

73, Pete N4ZR

At 07:54 AM 10/29/2004, David Robbins K1TTT wrote:

> you van use catv cable on your antennes buth you have to make 1/4 wave
> transformer
> from 60-62ohms coax to the antenna.

No you don't.  I use 75 ohm here for 160m through 70cm with runs up to
350' with no transformers and no problems on any band.


David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net




_______________________________________________


See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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_______________________________________________


See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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