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Re: [TowerTalk] RG-149: 50 ohm/70 ohm - does it matter?

To: [email protected]
Subject: Re: [TowerTalk] RG-149: 50 ohm/70 ohm - does it matter?
From: Steve Hunt <[email protected]>
Date: Sat, 14 Dec 2013 00:07:36 +0000
List-post: <[email protected]">mailto:[email protected]>
If you feed a perfect 50 Ohm load through a length of 75 Ohm transmission line, the SWR(50) at the input of the line will vary from 1:1 to 2.25:1 depending on the length of the line.

36% of all possible line lengths will cause the input SWR(50) to be 2:1 or higher.

If it's a multiband antenna it may be difficult to avoid that 36% on all bands!

Steve G3TXQ
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