Re: [TowerTalk] Managing Balanced line transitions

["Cecil Moore" <w5dxp@hotmail.com>]

> From: "Rick Karlquist" <richard@karlquist.com>
> Subject: Re: [TowerTalk] Managing Balanced line transitions
>
> Allan H. Kaplan wrote:
> > I would recommend NOT using baluns in connection with open wire line.
> > It's hard to guess what impedance they would see at a particular
> > frequency location along the line, and they do not work well nor with
> > low loss when they are mismatched.  In general, they will always be
> > mismatched in your situation!  For the coaxial sections you contemplate,
>
> OTOH, in my situation, they are always matched and see something
> close to 450 ohms.  I put the tuner at the antenna.  I wouldn't
> recommend running 350 meters of OWL in a mismatched condition due to the
> increase in loss and decrease in bandwidth.

Or in my situation where I always feed the balanced line at an SWR current 
maximum point which has a measured resonant resistance value between 25 ohms 
and 100 ohms. A 1:1 current balun-choke works very well at that point.
--
73, Cecil, w5dxp.com

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