On 2012-11-03 8:25 PM, WO0W wrote:
Perhaps you can take a portable transmitter and manual tuner to the
site. At the point where you wish to place an L network, attach the
manual tuner and transmitter and adjust the tuner for a good match.
Take the tuner away from the source of interference, put a 50 Ohm
dummy load on the tuner input, and measure the impedance on the tuner
output with the MFJ-259B. I believe that should be close to the value
of the impedance of the antenna that was measured, with little or no
affect from the strong broadcast signal.
In event the application you are using doesn't report the voltages on
the L network components, the application, Transmission Lines for
Windows, found on the CD with the late versions of the Antenna Book
will present values for the L components and the voltage applied to
each with a given input power.
73 de WOØW
This is a great idea. But don't forget that the output Z of the
terminated tuner will look like the conjugate of the antenna impedance.
In other words, the sign of the reactance (if any) will be reversed.
73, Terry N6RY
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