Abstract: A microwave amplifier for amplifying microwave signals, such as the microwave signals received by a microwave repeater station. The amplifier is formed of solid state amplifier-transistors to which the microwave signals are applied by way of transmission lines. The amplification circuitry and transmission lines are formed upon a circuit board which is housed within a heat-dissipative housing. The amplifier can be used in substitution for a conventional travelling wave tube, conventionally utilized to amplifier microwave signals received at a microwave repeater station.

Abstract: A feedforward predistortion equalizer includes a first loop with a signal divider for dividing signals into first and second portions, and a distortion generator for distorting the second signal. The first loop is completed by a signal combiner which combines the undistorted first signal and the distorted second signal. The phase and amplitude of the signals in the loop are controlled so that the linear or carrier signal component is cancelled, leaving at the output of the first combiner only the distortion component of the distorted signal. A second loop includes phase and amplitude controls for combining the pure distortion and undistorted signals to produce the desired predistorted signals. In a particular embodiment, the phase and amplitude controls of the first loop are automatically adjusted for a null.