Sorry, my previous message was placed in the wrong thread.

I can add that 4:1 and 9:1 fixed-ratio baluns should be used only between
known, well-defined, relatively narrow impedance ranges.

They are best NOT used on the transmission line side of tuners. Otherwise
the tuner is forced into dealing with reactances in the balun itself. This
restricts the range of antenna impedances which can be handled by the tuner.

Fixed-ratio baluns, with their excellent frequency response, are ideal on
the transmitter side of tuners, i.e., between precisely known impedances.
However they are seldom needed in that unusual position if the required
impedance transformation takes place in the tuner itself. As it always is
with a standard type of tuner and a 50-ohm transmitter.
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Reg, G4FGQ