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Topband: Turning a 160 Inv-L into a 160/80 Inv-L

To: topband@contesting.com
Subject: Topband: Turning a 160 Inv-L into a 160/80 Inv-L
From: Eric Rosenberg <wd3q@starpower.net>
Date: Tue, 12 Apr 2005 13:05:35 -0400
List-post: <mailto:topband@contesting.com>
I use a 160 inverted L, approx 65ftx65ft, with 21 radials.  It's a
vertical wire supported by a tee branch, not a tower.

I'd like to make this antenna useable on 80m too, and have read ON4UN's
latest on this subject.  From what John says in chapter 9, section 7, I
need to install "an 80-meter trap to isolate the horizontal part of the
160-meter inverted-L antenna when operating on 80 meters."

My questions: 
- what is the makeup of this trap (I need "Heathkit-like" instructions,
as I am no designer!
- where do I put this trap?

John's reference (ch 9, section 6.4) didn't clarify matters for me. 

73 and thanks in advance! 

Eric W3DQ
Washington, DC 
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