http://elecraft.85.s1.nabble.com/Baluns-wires-feeders-oh-my-tp394281p394282.html
Great Idea - thanks for pointing me to the obvious <GR>.
>
> From: Karl Larsen <
[hidden email]>
> Date: 2006/10/07 Sat AM 07:07:13 CDT
> To: Dave G4AON <
[hidden email]>
> CC:
[hidden email]
> Subject: Re: [Elecraft] Baluns & wires & feeders (oh, my!)
>
> 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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