"Ken" wrote in message
...
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?

Ken KC2JDY

Ken
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Ken

I consider dave,s suggestion to build a good transformer to be the best
way to estimate antenna impedance that is beyond the range of your meter.

Is a Smith Chart something you'd use? I cant say which method is best
for your use. But, I'd try estimating the antenna's impedance by
translating back toward the radiator with the assumption that you know. It
is necessary to know the *impedance*, not just the VSWR on the 50 ohm line.
Then, make an attempt to improve the antenna's impedance and see if your
assumptions are appropriate by re-measuring the impedance that results on
the 50 ohm line.

Jerry