[TowerTalk] KT36 Balun

Jim Brown jim at audiosystemsgroup.com
Mon Apr 28 12:38:53 EDT 2014

On 4/28/2014 8:01 AM, Michael Tope wrote:
> My only concern with that balun is how effective it is at preventing 
> feedline radiation compare to a conventional choke balun. Of course 
> there is no reason why you couldn't put a know good 1:1 choke balun 
> (like one of the K9YC designs) in series between the KLM 4:1 balun and 
> the coax. 

Yes. When I suggested a common mode choke, I did not realize the KT36 
needed a 4:1 impedance transformation. That's one of many reasons why I 
really object to use of the word "balun" in most of the ways it is used. 
If an application needs a transformer, CALL it a transformer. It it 
needs a common mode choke, CALL it a common mode choke.

Most "baluns" that do impedance transformation are poor common mode 
chokes, so adding a good common mode choke on the coax can reduce 
received noise and prevent signal picked up on the coax from filling 
nulls in the antenna's pattern.

73, Jim K9YC

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