[Towertalk] 40 meter boom, 80 meter dipole?

[Jim White]

would it be easier to use the truss as a loaded dipole - you can mechanicaly
isolate it easily????

K4OJ

----- Original Message -----
From: "Paul Young" <k1xm@underwater.org>
To: <towertalk@contesting.com>
Sent: Tuesday, May 21, 2002 12:51 PM
Subject: [Towertalk] 40 meter boom, 80 meter dipole?


> I have a three element 40 meter beam.  I'm thinking about
> matching the boom as an 80 meter short dipole.
>
> The boom length is 48'.  The driven element is insulated but
> the parasitic elements are connected to the boom.  They are
> full size and provide plenty of end loading.  It has a T-bar
> truss which is not insulated but I don't think I would want
> to use it to feed the antenna.
>
> The problem, of course, is feeding it.  Tilting the antenna
> is difficult, but I figure I can tip it once and install
> some sort of omega rod.  Then I can tune it from the mast.
> The bandwidth may be narrow enough that I'll need to put up
> a relay to switch it to phone.
>
> Has anyone tried this?  What sort of omega rod will I need?
> Any caveats?
>
>                            Paul, K1XM
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