What impedance ratio are you interested in? Reason for asking is that
when I was looking for prior art on current baluns I came across a very
interesting 1:1 design that uses two equal length pieces of coax that would
each be less than an eighth of a wavelength long and which has a very wide
bandwidth. I copied the schematic (which has a slight error) and the photo
to a single sheet PDF file if anyone's interested.

Chris

,----------------------. High Performance Mixers and
/ What's all this \ Amplifiers for RF Communications
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\ _______,--------------' Chris Trask / N7ZWY
_ |/ Principal Engineer
oo\ Sonoran Radio Research
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Graphics by Loek Frederiks

"Reg Edwards" wrote in message
...
A choke balun is what is inserted between the transmitter end of the
antenna feedline and the transmitte tuner. Or it can be inserted at
the antenna end of the line.

Questions : How effective is it? To what extent can the percentage
unbalance current on the feedline be expected to be reduced? Has
anybody ever measured it before and after insertion?
----
Reg.