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Topband: Open wire feeder

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Subject: Topband: Open wire feeder
From: kimba at (Bert Barry)
Date: Fri Aug 8 11:08:10 2003
This is true for a feedline badly mismatched at the antenna.  I feed a
multi-wire rhombic with an 800 foot open wire line (600 ohms) and my SWR is
under 1.5 : 1 from over 21 MHz to 3.5 MHz!  And the loss is not measurable.

Bert,  VE3QAA

Donald Chester wrote:

> >Any thoughts on a 600' or 700' run of open wire feeder.
> >Anything special I need to be aware of?
> The tuning adjustment at the matching device will be more cricical, since
> you will be running over a full wavelength of tuned feedline.  A given
> change in frequency will move the current /voltage points along the feedline
> a greater percentage of a wavelength than if the feedline were only a
> quarter wavelength or less.  You will not be able to QSY as far without
> retuning.

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