| 摘要 |
PURPOSE:To enable non-interruption at selection and to clearly discriminate the failure in receiver, by providing the means monitoring the synthesizing section synthesizing the output signal of existing and spare receivers and the means of selective control. CONSTITUTION:The microwaves received at the antenna 1 are fed to the microwave switches 3 and 4 via the circulator 2, constituting one as normal reception and another as leakage reception. The reception signal is the base band signal at the demodulators 5, 6 and synthesized at the synthesizing section 14. The pilot and noise level of the receivers 5 and 6 are monitored at the monitor boards 7, 8 and RF level of the receivers 5, 6 is monitored at the electric field comparison and detection unit 15, and the logic board controls the synthesizing section 14 with the monitor signal. Further, the failure of the receivers 5, 6 can be monitored by the monitor boards 7, 8 and the monitor of the microwave switches 3, 4 can be monitored at the detector 15. |
