[TowerTalk] Type 31 baluns

[Jim Brown]

On Tue, 1 Jun 2010 15:18:59 +0200, DF3KV wrote:

>Why should one bother for wire and core insulation if the balun will be used
>to feed a 50 ohms load?

To kill common mode current. See http://audiosystemsgroup.com/RFI-Ham.pdf

The word "balun" has been used to describe many very different things. 
Impedance transformation by series/parallel combinations of common mode 
chokes is only one of those things. I try not to use the word "balun." The 
thing being discussed here is a common mode choke. It is commonly called a 
current balun. 

73,

Jim Brown K9YC