[TowerTalk] Bazooka 1/4 wave balun

[Jerry K3BZ]

Tom...read your website, thanks. I'm looking for a good balun at 6M.  I
suppose a 1/4 wave length of braid from an old section of large-diameter
coax could be slid onto 50 ohm coax feedline, but you suggest a greater
spacing than that provided by the coax jacket thickness alone. Couple
questions:

 To provide a larger distance from coax braid to sleeve, would a length of
PVC pipe slid over the coax be a suitable material?  With, say, a 1.5" or 2"
OD? If not, can you suggest something?

Velocity factors for standard coax are available, but how would one
calculate the VF for the sleeve if it's on a 2" OD PVC pipe?

73, Jerry K3BZ
----- Original Message -----
From: "Tom Rauch" <w8ji at contesting.com>
To: "Jerry K3BZ" <k3bz at arrl.net>; "(Reflector) TowerTalk"
<towertalk at contesting.com>
Sent: Wednesday, July 06, 2005 9:23 AM
Subject: Re: [TowerTalk] Bazooka 1/4 wave balun


>
> > What is a "bazooka 1/4-wave balun" ?
> > An article I'm reading makes reference to using a
> "balun... or even better, a bazooka 1/4-wave balun" at the
> feedpoint of a quad element, using a 50-ohm coax feedline.
> > Is this a 1:1 balun?
> > Is a "bazooka balun" better than a balun? If so, why? and
> where can I get info on building one?
>
>
> http://www.w8ji.com/Baluns/sleeve_baluns.htm
>
>