Couple ways-- Requires non inductive resistor -- If have a
MFJ-259 (ect) or a Noise bridge, connect your resistor to the X9
output side of the balun, connect the input side of the balun
to the MFJ, and sweep the frequencies, -- the meter should
stay FLAT, at 1:1 (or close to it) over the range it is designed for.
SWR should be flat over the range you want to use! Jim NN7K

That's the way I have checked impedence transformers in the past.
I have found that a Variable resistor works pretty good for testing with a
MFJ-259.
Used it for half-wave coax baluns, as well as wind-it-yourself transformers.
Set the variable resistor to the expected value to match, then check it with
the MFJ-259,
it worked for me - on hf and 2-meters. Didn't try it on the uhf freqs.
I used to like to use 300-ohm twinlead because the weight didn't make the
dipole sag as much as coax.






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