[TowerTalk] TH7 SWR trouble ... Coax balun question

[Tom Rauch]

I'm a little puzzled by this:

> "A 1:1 coaxial balun with excellent choking reactance for 10 through
> 20 meters can be made by winding 6 turns of RG-213 on inexpensive 4
> inch PVC sewer pipe."

The 6 turn 10, 15 and 20 meter balun is good enough, but not really 
optimized.

It should have it's impedance peak centered around 20 MHz, not at 
24 MHz.

Eight or nine turns would be better.
73, Tom W8JI
w8ji@contesting.com

--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm