On Sat, 12 Mar 2005 08:24:05 -0500, Ken wrote:

I have built an antenna analyzer (AA-908) that reports SWR, complex
impedance, capacitance and inductance. It works fine with coax-fed
resonant antennas.

How can I use it to test a 40M double zepp with 300 ohm twinlead
feedline? I am at this point interested in finding the frequencies in
160M band at which this antenna and particular-length feedline will
propagate.

Needless to say, I see maxed out numbers almost all the time (SWR10
and impedance 600). Should I use a balun? Is there something I can
use (like a 50 ohm resistor in parallel) that will give me numbers
that I can use? What should I be looking for?

Dear Ken,

Here's something else to keep in mind. Your new instrument is designed
and calibrated for use on 50 ohm transmission line. Even if your 300
ohm twinlead were matched properly to an antenna, and there are no
standing waves on the line, your instrument will still show an SWR of
6:1


Bob, W9DMK, Dahlgren, VA
Replace "nobody" with my callsign for e-mail
http://www.qsl.net/w9dmk
http://zaffora/f2o.org/W9DMK/W9dmk.html