Abstract: A relay station is composed of a main reception antenna 1 for receiving both a radio wave of a parent station and a go-around radio wave of a relay station, a subsidiary reception antenna 2 for receiving the go-around radio wave of the relay station, a changeable attenuator 3 and a phase shifting unit 4 for changing an amplitude and phase of a signal received in the subsidiary reception antenna 2, a composite signal producing unit 5 for producing a composite signal from a signal received in the main reception antenna 1 and the signal sent from the phase shifting unit 4, an electric power detecting unit 9 for obtaining a composite electric power from a composite voltage extracted in a directivity coupling unit 8, and a microcomputer 10 for controlling a change of amplitude in the changeable attenuator 3 and a change of phase in the phase shifting unit 4 so as to minimize an average value of the composite electric power obtained in the electric power detecting unit 9.

Abstract: A feedforward amplifier combines an input signal delayed by a delay circuit with an output signal by a combiner; down-converts the output of the combiner to a low frequency by a frequency converter; extracts a distortion component from the output of the frequency converter; measures the distortion component by a power detector; and controls a second vector regulator of a distortion canceling loop by a controller such that the distortion component measured becomes minimum.

Abstract: A feedforward amplifier combines an input signal delayed by a delay circuit with an output signal by a combiner; down-converts the output of the combiner to a low frequency by a frequency converter; extracts a distortion component from the output of-the frequency converter; measures the distortion component by a power detector; and controls a second vector regulator of a distortion canceling loop by a controller such that the distortion component measured becomes minimum.

Abstract: A first facsimile apparatus effects a paper saving printing on the basis of the received video data for saving consumption of a recording paper by the contraction-printing in the longitudinal direction of the recording paper and it stores the video data in paper saving mode. The user can obtain a non-contracted copy using the stored video data. A second facsimile apparatus, in the paper saving mode, only prints a message information portion and a file number generated in response to the call on the recording paper in response to every facsimile call to form a list of reception of facsimile calls and stores the received video data in a memory in associated with the file number. The user can selectively print out the stored video data with reference to the list of facsimile calls.