I have a 40/80 droopy on air as I type, using an ugly balun -- it worky
worky. in the way-back, I tried to incorporate 20M on that single coax
connection .. that screwed all 3 bands up to the point of frustration. 40M
and up, or 40/80---in mho. Mark -- AA6DX
-----Original Message-----
From: Jim Brown
Sent: Sunday, October 1, 2017 9:26 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Fan dipole construction methods
On 10/1/2017 5:19 AM, Joe Subich, W4TV wrote:
I would not recommend a parallel/fan dipole with 80/30 meters. I've
tried it several times and the 80 meters wire detunes 30 meters. The
antenna works as badly as if one simply used a tuner to force power
into the 80 meter wire.
I agree completely. For about five years, I had a 2-wire fan for 80 and
40. with loading coils and some wire added to the 80 dipole that
resonated it on the low end of 160. It worked well on all bands and also
on 30M and 15M. When part of the antenna broke, I rebuilt it without the
160M coils and wire, and it no longer worked on 30M. Modeling predicted
the poor 30M result. The loading coils for that antenna came from
Hypower Antenna Co, a W3 ham in his basement. Good guy, good stuff,
don't remember his call.
Paul -- my construction details are in the links I've posted here, and
are on my website in the slide show about antennas for limited space.
73, Jim K9YC
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