I have dual polarization on my 10 meter quad. Should be the same for an 80M.
In order for it to work, each feedpoint MUST be gamma matched AND choked off
with a 1:1 balun (coiled coax works, but lots needed for a 80M freq). If you
don't do it this way, the unused feedline will load the loop, an never work.
I spent a few months perfecting it. When done, you can try something really
interesting by feed both feedpoints with one 90 degrees different to obtain
circular polarization... reduces cross polarization QSB somewhat like
----- Original Message -----
From: "Bob Selbrede, K6ZZ" <email@example.com>
Sent: Monday, January 08, 2007 10:56 PM
Subject: [TowerTalk] Switchable Polarization Delta Loop
> Has anyone built a switchable feed system for a full wave
> 80M delta loop that would allow feeding it 1/4 wave down
> from the apex for vertical polarization and also in the
> middle of the baseline for horizontal polarization? It
> seems like a good way to maximize a delta loop for both DX
> work and closer-in contesting applications.
> 73, Bob K6ZZ
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