Space diversity receiver with means for combining signals from the two channels

摘要

A space diversity receiver with a combiner in which the useful signals of two space diversity receiver branches are connected together with a summing amplifier in the IF frequency band, and wherein an electronically controlled phase corrector P is mounted in one of the receiver branches and in which a phase monitoring circuit provides an output signal to control the phase corrector and is connected at the output of the electronic phase corrector between the two receiving branches. The space diversity receiver is constructed in the simplest possible manner with the lowest possible electrical interference and provides that the phase monitoring circuit consists of a phase discriminator D1 to which the signal from one reception branch is supplied through an automatically gain control amplifier RV2 without phase shift and the signal from the other receiving branch is supplied with an identical automatically gain controlled amplifier RV1 and through a 90-degree phase shifter. The output signal of the phase discriminator D1 is supplied to a comparator K0 and to a square law transfer circuit QS and depending on its absolute value determines the clock frequency of a clock generator T that drives a forward/backward counter Z. The respective position of the forward/backward counter Z is converted with a memory SP so as to control the phase corrector P which can be set in a step-by-step manner.