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Re: [TowerTalk] 80 Meter beam

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 80 Meter beam
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Fri, 31 Mar 2017 10:00:39 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Fri,3/31/2017 5:00 AM, Martin Pelt wrote:
I am putting a 80 meter 2 element inverted vee beam up. It will be at 120
feet with 39 foot boom.

I have 2 questions dealing with switching from phone to cw without lowering
elements and using jumpers.

I have a 2-element flat Yagi for 80/75 at 140 ft. It consists of two wure dipoles strung between trees, fed with low loss RG11. I retune the antenna from CW to SSB by switching in sections of line in the shack on the dipole that is the reflector. My design is based on a 2-part NCJ piece by W6AM, who rigged two wires, fed them with a half wave of open wire line or twin lead, and switched in L or C in a tuning enclosure at ground level. In my implementation, the L and C are provided by those lengths of coax acting as open and shorted stubs.

I strongly agree with the advice by others that you MUST model whatever you plan to do.

73, Jim K9YC

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