Re: Baluns & wires & feeders (oh, my!)
Posted by
Karl Larsen on
Oct 07, 2006; 1:07pm
URL: http://elecraft.85.s1.nabble.com/Baluns-wires-feeders-oh-my-tp394281p394291.html
Dave G4AON wrote:
> There is a simple way to measure the efficiency of a balun, make two of
> them and connect them "back to back". Measure the power fed to them and
> the corresponding output power. Obviously this doesn't take a mismatched
> antenna into account.
>
I did just that about this 5 years ago. I used two MFJ tuners
connected by the 4:1 baluns in each. I fed one from my MFJ Antenna
Analyser and hooked a 50 ohm resister to the other tuner. I measured the
voltage across the resistor with a RF probe.
Alas I can't locate the paper where I wrote down the results. Over
the bands the loss was around 10-15% I recall and I thought that was
about what I expected.
73 Karl K5DI
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