James Barrett wrote:
So a tuner is really there to protect the transmitter.

It does that by not allowing reflected energy to
reach the transmitter and redistributing the
reflected energy back toward the antenna as
part of the forward wave. Thus a transmitter can
be sourcing 100 watts while the forward power
on the transmission line is 200 watts.

You still need the wire cut to frequency if you
want to maximize efficiency and minimize the SWR in the wire.

Efficiency can also be maximized by choosing a
near-lossless transmission line. In that case,
SWR doesn't necessarily need to be minimized.
--
73, Cecil http://www.w5dxp.com