[TowerTalk] 80M Inverted V - CW and SSB

[Jim Brown]

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