Topband: Dipole/remote tuner

Jim Brown jim at audiosystemsgroup.com
Sat Nov 12 13:07:27 EST 2022


On 11/12/2022 8:08 AM, jcjacobsen via Topband wrote:
> You have a wire dipole for 75 meters fed with a 1:1/5K rated balun. 

Commercial "baluns" are next to useless. I use one of these on all of my 
six dipoles.

http://k9yc.com/2018Cookbook.pdf

There are several very good ways to match an 80/75 dipole over 3500-3900 
kHz, so that an in-shack tuner can easily match it. The one I recommend 
is described in this applications note about using SimSmith to design 
matching networks. It's really simple, involving nothing more than 
adding a length of different coax to the feedline. It's a very old 
technique -- W6NL, who taught at Stanford, is credited with it by local 
hams, but he said it's MUCH older than he is. :)

http://k9yc.com/PacificonSmithChart.pdf

73, Jim K9YC






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