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[TowerTalk] dB Loss Equivilents for SWR Values

To: <towertalk@contesting.com>
Subject: [TowerTalk] dB Loss Equivilents for SWR Values
From: heatwole@clark.net (Nat Heatwole)
Date: Fri, 25 May 2001 19:03:17 -0400
Whoa. Thanks for all of the fast responses. The most popular suggestion
appeared to be looking in the ARRL Handbook. I checked out the handbook and
with some consideration I figured out the following formula to get
equivalent coax db loses from an SWR value:

((SWR - 1) / (SWR + 1)) ^ 2 * 100% = % Lost
10log(100/(100 - % Lost)) = Loss In dB

So if your SWR's 3.0/1:

((3 - 1) / (3 + 1)) ^ 2 * 100% = 25% Lost
10log(100/(100 - 25)) = 1.25db Loss

Thanks for all the information!

73, Nat, WZ3AR
<heatwole@clark.net>
Damascus, Maryland


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