Cecil Moore wrote:
Dieter Kiel wrote:
As the tuner is used to match the impedance of the radio to the line it
will effect the power getting to the antenna or the signal received from
the antenna if it is passed through the tuner.

If the power getting to the antenna is measurable, then
the tuner is causing something to happen at the antenna.
It is doing more than just making the transmitter happy.
After all, a dummy load makes the transmitter just as
happy as a tuner.

Cecil;

An antenna tuner does not and can not and will not make any physical or
electrical changes to any antenna it is attached to. It will, however,
make electrical changes to an "ANTENNA SYSTEM" such that a transmitter
or receiver will react to the system more efficiently.

Take a dummy load that exhibits a characteristic impedance of say 75
ohms and hook it up to a transmitter that exhibits a characteristic
impedance of 50 ohms. I guarantee that the transmitter won't like it as
well as a dummy load that exhibits a characteristic impedance of 50
ohms. All impedances are purely resistive with no inductive component.
Place a tuner in the circuit and adjust it for best conditions. The
transmitter will think it is looking at 50 ohms not 75.

Dave WD9BDZ