[TowerTalk] Voltage or Current Balun?

Bill Coleman aa4lr@arrl.net
Tue, 7 Aug 2001 14:56:57 -0400

I'm in the midst of erecting a tower for my quaint little A3S. In 
readying the A3S, I need to consider how to add a balun.

Cushcraft recommends a coiled coax balun, which I know would work great, 
and I have used it before. But, for several reasons, I have decided to 
forgo the coiled coax balun.

Some time ago, I purchased a bunch of ferrite beads that are large enough 
to slip over RG-213. I have 25 of these (totally 28 inches). I intended 
to use this as the balun for the A3S. Because of the sheer size and 
weight of this balun, I've decided to look at alternates.

What I'd like to do is mount a balun in a small, plastic box near the 
feedpoint, and mount a standard SO-239 connector. This avoids the 
"splitting the coax" problem with this antenna. The question I have is -- 
what kind of balun?

I have a toroidial balun kit for a voltage-type balun that I could use. 
But I'm considering ordering a kit for a current-type balun.

Power handling capability isn't really an issue here. I know some people 
have had trouble trying to run a full gallon into some current-type 
baluns. I don't own an amplifier. If I ever did, it would probably be in 
the 400-1000 watt range.

Opinions? Are current-type baluns better for a wide-range antenna such as 
the A3S?

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr@arrl.net
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901

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