Abstract: A novel nonfrequency-converting microwave radio repeater for use in multichannel telecommunications is disclosed. A single microwave amplifier provides the requisite gain for two different angle-modulated radio frequency signals. Bandpass filters and circulators permit duplex operation by channeling the received signals through the repeater. The two radio frequency signals are amplified simultaneously in the same amplifier and then separated to be retransmitted at the same frequency in the proper path direction.

Abstract: A composite test signal consisting of a search test signal and a sweep test signal from a link test set is combined with the through-path traffic signals during in-service testing. The composite signals are simultaneously applied to a transmitter of a microwave radio communication link under test. The sweep signal level is adjusted at the microwave radio communication link transmitter so that the total FM deviation is limited to the normal IF or RF transmission frequency band. The composite test signals and traffic signals are received and split into a through path signal and a test path signal. In the through path, the test signals are blocked, and the traffic signals are transmitted to the next microwave radio hop. In the test path, the traffic signals are blocked, and the test signals are applied to the receive section of a link test set. The link test set is then used to measure the transmission characteristics of the microwave radio communication link under test.