[TenTec] 160 meters, ten ted 238 tuner, part two

Jim Brown k9yc at audiosystemsgroup.com
Fri Nov 1 11:40:02 EDT 2013


On 10/31/2013 11:51 PM, Rick - DJ0IP / NJ0IP wrote:
> Please help me out here

I've done my best, both in the RFI tutorial and in the Power Point on 
coaxial chokes that are on my website.

Throughout, you insist on using the word "balun" with some qualifying 
adjective. Why use the word "balun" at all? It is clearly inadequate to 
describe the device in question, and is a major obstacle to understanding.

If what we want is a common mode choke, we should CALL it a common mode 
choke.  Then we realize that we must understand what it does in the 
common mode circuit to understand how it works and what its limitations 
are. When we call it a current balun, we don't know what it is or how it 
acts -- 99.9% of hams view it as a mysterious black box.

If what we want is a half wave of transmission line to go from the 
feedpoint of one side of a  dipole driven element to the other, we 
should call it a half wave of transmission line, because that's what it 
is. And when we CALL it what it really is, we understand how it works, 
and we understand that it only works at the frequency where it is a half 
wave.

73, Jim K9YC


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