[TowerTalk] Balun question
k3bu at optonline.net
k3bu at optonline.net
Wed Jun 13 21:08:58 EDT 2007
> Can anyone tells me what happens? Should I be using a
> current-type balun
> ala' W2AU or should I wind the choke? If so, what size is it?
>
> Part deux. In my meager understanding, a balun is a
> transformer that
> goes from balanced-to-unbalanced (bal-un, get it?) vis-a-vis a
> feedpoint. It
> also functions as an RF choke to prevent RF from spilling down
> the outside of
> the shield. A coax wound RF choke doesn't really "transform"
> anything but does
> choke the stray RF trying to come down the outside of the
> shield. Am I close?
>
> Anyway, all comments appreciated.
>
> Cheers,
> Steve K7LXC
> TOWER TECH
>
For mono-band antennas I prefer "bazooka" balun. It is a quarter wave stub wired per instructions in handbooks etc. Advantage is low loss, no ferites, it is a bal-un and also bandpass filter. Also widens the bandwidth of antenna, its reactance works opposite the antenna's reactance, SWR curve is more flat.
Yuri, www.K3BU.us
www.TeslaRadio.org
More information about the TowerTalk
mailing list