I have found that a 4:1 balun is seldom the proper choice for a ladder
line interface. I measure the impedance at the interface and then select
the balun type (usually a 1:1). The biggest problem I've had is the 4:1
transforming the impedance too low for the tuner. This can result in
over stress on the components as the power is increased. If I don't have
an easy to match ladder line interface I add or subtract line length
until I get one.
73
Bill, W6QR
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