Richard Fry wrote:
"This topic deserves more attention---."

Then Richard Fry attached a paper which includes:
"If the source impedance were equal to the fifty 0hm line impedance,
half the transmitter`s output power would be dissipated in its internal
output source impedance."

For a specific transmitter, that is certainly possible, but the
statement is wrong as a general statement.

Many transmitters, such as the familiar type that uses a Class-C final
amplifier, are 60 to 80% efficient..This does not mean it is not
adjusted for maximum power transfer. It may well be conjugately matched
and still exhibit high efficiency, the reason for using the Class-C
configuration.

The internal resistace of a Class-C amplifier consists of two parts. One
part gets hot and the other does not.

The part that gets hot is ortdinary loss. The part that does not get hot
is the switched-off time of the final amplifier. It is just as adept at
opposing transmitter output as is the common resistor, but it makes no
heat.

Best regards, Richard Harrison, KB5WZI