W9RX slung a full size 40M dipole under his TH6 boom.
Check April 1974 QST. Might be able to trapp it for 40m/30m.
Mike K9MK
________________________________
From: Larry K4AB <larry.k4ab@gmail.com>
To: Glenn Pritchard <hfcomnet@gmail.com>
Cc: Tower and HF antenna construction topics. <towertalk@contesting.com>
Sent: Tuesday, March 4, 2014 2:27 PM
Subject: Re: [TowerTalk] TH7dx with 40 meters
Why not gamma-match the boom of the TH-7 as a rotary dipole for 40?
Check the archives, or the NCJ archives for the details.
Works great!
73,
Larry K4AB
On Tue, Mar 4, 2014 at 1:57 PM, Glenn Pritchard <hfcomnet@gmail.com> wrote:
> Hello gang,
>
> Has anyone thought of adding a set of 20 meter traps to the driven element
> of a th7 to add 40 meters?
> If so which traps, th5 or th6?
>
> I have been thinking of this and putting the traps on the first driven
> element then experimenting with the length.
>
> This would give me a rotatable dipole on 40.
>
> My first idea was to put a 40 meter two element Yagi on the th7 boom and
> adding additional struts.
>
> Any thoughts?
>
> Glenn, VE6ND
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