[Elecraft] Antenna Theory

[Vic Rosenthal]

George, W5YR wrote:

> Right on, Vic - a case of your writing one thing and my reading another. Our
> only point now is that a line with high SWR need not necessarily present any
> problems to a balun. It all hinges on the differential-mode impedance at the
> point where the balun is connected and, again, high SWR does not always mean
> high input impedance which is the most stringent case for a balun. Even a
> line with relatively low SWR can have an input impedance at a voltage loop
> that can stress a balun.

You're correct.  But keep in mind that a simple antenna used on 8 or 9 
bands is likely to present all kinds of impedances at the end of the 
feed line.  I think the lesson of this discussion has been that it is 
not so easy to design an efficient antenna system consisting of a 
multiband doublet fed with balanced line, unless you have a balanced 
tuner available.  Even then, you have to watch those impedance excursions!

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco