[Elecraft] Antenna Theory

[George, W5YR]

We are now singing the same song from the same page in the hymnal.

73, George W5YR
Fairview, TX
w5yr@att.net
http://www.w5yr.com


----- Original Message ----- 
From: "Vic Rosenthal" <vic@rakefet.com>
To: "George, W5YR" <w5yr@att.net>
Cc: "Mike McCoy" <mikemccoy@austin.rr.com>; "Elecraft"
<elecraft@mailman.qth.net>
Sent: Thursday, March 25, 2004 3:58 PM
Subject: Re: [Elecraft] Antenna Theory


> 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!