[TowerTalk] Subject: 4:1 balun questions KT-34XA

Steve Hunt steve at karinya.net
Tue Oct 28 17:13:17 EDT 2014

It's worth noting that the two 1:1 current baluns forming a 4:1 Guanella 
balun will likely have very different CM voltages across them, leading 
to very different core dissipations. In fact if the two 1:1 baluns are 
ideal and the load is balanced, the CM voltage across one will be zero 
and the CM voltage across the other will be the input voltage!

The message is that you can't assume that the core dissipation due to CM 
voltage and current will be equally "shared" between the two baluns 
forming a 4:1 Guanella balun.

Steve G3TXQ

On 28/10/2014 16:36, Earl Morse wrote:
> You can get higher power capability by using a larger core, stacking multiple cores to make a larger core, or using 2 1:1 baluns on separate cores in a series parallel combination to make a 4:1 balun.
> Sevick's books cover it pretty well.  This page talks about it as well:  http://www.g8jnj.net/balunsandtuners.htm
> Earl
> N8SS

More information about the TowerTalk mailing list