[TowerTalk] How to mount choke balun?

Bill Coleman aa4lr@arrl.net
Fri, 16 Nov 2001 09:28:18 -0500


On 11/15/01 9:18 PM, Tom Osborne at w7why@harborside.com wrote:

>I may be wrong, but I thought the coils need to be at least 8" in
>diameter to work.  Isn't winding RG8 in a 4" circle kinda
>stressing it a bit? 

Ed Gilbert's famous posting about coiled coax baluns mentions using a 4" 
form. It should not be a problem so long as a solid dielectric coax is 
used. Foam dielectric coax might suffer from some center conductor 
migration -- which could lead to a failure.

Regardless, from Ed's note, you really need a form for a coiled coax 
balun anyway. You want the coax in one layer, and you don't want to bunch 
the turns at all. That's really hard to do without a form.



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


List Sponsored by AN Wireless:  AN Wireless handles Rohn tower systems,
Trylon Titan towers, coax, hardline and more. Also check out our self
supporting towers up to 100 feet for under $1500!!  http://www.anwireless.com

-----
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com