The article says that "its relatively low impedance makes this type less
susceptible to the irregularities introduced by insulators and switching
arrangements." Interestingly, the article also states that Henry used side
connected wires, not cross-connected wires, since the latter arrangement is
a little better for transmitting.
Jerry AI6L
----- Original Message -----
From: "Richard Karlquist" <richard@karlquist.com>
Sent: Saturday, August 09, 2003 9:48 PM
Subject: RE: Topband: Re: Open wire feeders
> > I was pleased to see Craig, K1QX, and others refer to my October 1980,
> > "Long transmission line for optimum antenna location." I am still using
> > my 4-wire lines, cross connected, to my two beams over 400 feet from the
> >
> > Henry G. Elwell, Jr. - N4UH
>
> Perhaps the article answers this question, but why are
> 4 wire lines used? The only possible advantage I can
> think of would be lower characteristic impedance, but
> since it is easy enough to build a good 50 ohm to 450
> ohm broadband transformer, that doesn't really seem
> to be much of an advantage. I would think the loss for a
> given weight of copper per foot of line would be
> about a wash. Also, I would think connecting the
> lines in parallel instead of crossed would give
> a lower loss per foot because the impedance is
> higher.
>
> Rick N6RK
|