More articles and new program now on web
 

I've uploaded two more articles to my web site:

"Antenna Feed Lines for Portable Use", from Technical Correspondence,
QST, Feb. 1992. This includes measurements I made of 300 ohm twinlead
which showed that it can become very lossy when wet.
http://eznec.com/Amateur/Articles/Po...Feed_Lines.pdf.

"The Simplest Phased Array Feed System - That Works", from the ARRL
Antenna Compendium, Vol. 2. If you simply cut "phasing lines" to
electrical lengths equaling the delay between elements in a phased
array, you won't usually get anywhere near the phase delay you expect.
You'll also get unequal element currents. The reasons for this are
explained in Chapter 8 of the ARRL Antenna Book, and briefly in this
article. The article shows how "phasing line" lengths which *do* work
can be calculated, and new program Simpfeed
(http://eznec.com/Amateur/Articles/SimpfeedZip.exe) does the
calculations for you.

Roy Lewallen, W7EL