"Scott in Baltimore" wrote in message
...
The amount of inductance is determined by the number of coils
and how closely spaced together they are. There is not going
to be much difference in three feet. Maybe wrapping the coil
with aluminum foil would help to increase the coupling on
the coil to increase the inductance.

Inductors are the exact electrical opposite of capacitors.

Capacitors block DC and pass AC. They have decreasing reactance
to higher frequencies. Current leads the voltage by 90 degrees.

Inductors block AC and pass DC. They have increasing reactance
to higher frequencies. Current lags the voltage by 90 degrees.

The inductance in the coil only affects the outside of the shield,
the exact place you don't want current flowing. It won't affect
the signals inside the coax.

This recipe states that the amount of coils is unimportant and to wrap them
as close as possible without over lapping. This balun relies on the length
which has a 3 foot margin.