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Re: [TowerTalk] 80M Inverted V - CW and SSB

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 80M Inverted V - CW and SSB
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 21 Oct 2013 09:44:30 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 10/21/2013 2:50 AM, Doug Scribner wrote:
I'd like to find a quick way to switch between the CW and Phone portions of the 
band.

There's an easy method to obtain a broadband match using transmission lines. Carefully tune the antenna for 3675 kHz. Feed it with a half wave, or a full wave, of 50 ohm line beginning at the antenna, then a quarter wave of 75 ohm cable, then as much 50 ohm cable as you need to get to the shack. Measure those lengths carefully as a stub at 3675 using something like a MFJ 259. This will give you a match in the shack below 2:1 from 3500 to 3900. Make that first 50 ohm length the least number of half waves that will still reach the shack. This method is shown in detail in a presentation I did last year at Pacificon.

http://k9yc.com/PacificonSmithChart.pdf <http://audiosystemsgroup.com/PacificonSmithChart.pdf>

73, Jim K9YC


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