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Re: [TowerTalk] 75 ohm - v - 50 ohm coax

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 75 ohm - v - 50 ohm coax
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Tue, 19 Feb 2013 11:16:24 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 2/19/2013 10:54 AM, Steve Hunt wrote:
The SWR on the 75 Ohm line will be 1.5:1, but if the line is a quarter-wave or odd multiple long, the 50 Ohm load impedance is transformed to 75*1.5 or 112.5 Ohms - that's an SWR(50) of 2.25:1.

In fact any line length between 0.15 wavelength and 0.35 wavelength will transform the load impedance to produce an SWR(50) greater than 2:1.

My, my -- some of us do work pretty hard to find worst case scenarios.

73, Jim K9YC
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