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Re: [TowerTalk] Turn 80m dipole inv v into something for 30m

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Turn 80m dipole inv v into something for 30m
From: W0MU Mike Fatchett <w0mu@w0mu.com>
Date: Sat, 28 Oct 2017 12:54:01 -0600
List-post: <mailto:towertalk@contesting.com>
I was trying to avoid climbing.  I have a SteppIR with the 30/40 so this would be an extra antenna for the 2nd radio.

I tried researching a 1.5 wavelength dipole antenna on the internet but didn't find too much.


On 10/28/2017 12:19 PM, Joe Subich, W4TV wrote:

On 10/28/2017 1:37 PM, Doug Smith wrote:
> Maybe an 80 / 30 M. fan dipole?

Doesn't work - at least for me.

The 80 meter element is too short but close enough to being resonant on
30 meters that I was never able to tune the 30 meter element so that it
yielded a low SWR (showed resonance) anywhere near the 30 meter band.

On Oct 28, 2017, at 10:13 AM, W0MU Mike Fatchett <w0mu@w0mu.com>
wrote:
>>
I have an 80 inverted V that I would like to transform to something
useful for 30m.

Mike, if you need 80 and 30 meters on the same feedline, get a set of
Reyco KW30 traps and make an 80/30 meter trap dipole.  If you don't need
80 meters (the 80 meter inverted V is surplus) cut it down to a proper
30 meter single band antenna.

73,

   ... Joe, W4TV


On 10/28/2017 1:37 PM, Doug Smith wrote:
Maybe an 80 / 30 M. fan dipole?  IOW, add a 30 meter Inverted-V to the 80 M. Inverted-V...

73,
Doug
http://www.w7kf.com


On Oct 28, 2017, at 10:13 AM, W0MU Mike Fatchett <w0mu@w0mu.com> wrote:

I have an 80 inverted V that I would like to transform to something useful for 30m.

It is fed with RG213 and a balun at the feedpoint.

It is close to 3/4 wavelengths on each side which might be ok but the match is going to be bad.

It might just be easier to toss up an 1/2 wave V and not worry about the 80m.

Suggestions or comments welcome!

W0MU


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