SPACE DIVERSITY RECEIVING SYSTEM

PURPOSE:To perform switching of an SD (space diversity) circuit with no hit and also to eliminate the effect to other circuits, by performing switching between the main and secondary antennas for SD circuit while a burst signal is switched to another burst signal for a slave station using said SD circuit. CONSTITUTION:A burst signal is supplied to main and secondary antennas 7 and 8 from a slave station A through an SD circuit. An antenna switch circuit 11 usually selects the antenna 7. While the burst signal supplied from a slave station B through an antenna 9 is synthesized by a hybrid circuit 2 and set within a frame. Then this signal is demodulated by a receiver 13, and the original base band signal is extracted through a terminal 10. Here if the SD circuit has a fading fault and the errors of the base band signal are increased, a switch drive circuit 12 is actuated. At the same time, the circuit 11 is actuated between a burst signal given from the station A and the next burst signal. Thus the antenna 7 is switched to the antenna 8. The circuit 11 consists of a diode and ferrite and has an extremely short working time to switch the SD circuit with no hit.