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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