H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/110
H04B 7/208 (2006.01)
Patent
CA 1289625
Abstract of the Disclosure: In a satellite communication system for carrying out communication between a central station and local stations, each local station includes a receiving apparatus (41) which comprises a converting unit (43) for converting a received radio signal of a received carrier frequency into a converted signal by using a reception carrier signal of a reception carrier frequency and a demodulating unit (44) for demodulating the converted signal into a demodulated signal. Connected to the demodulating unit, a deciding unit (45) decides whether the demodulated signal is normal or abnormal. The deciding unit produces an abnormal signal when the demodulated signal is abnormal. After reception of the abnormal signal, a timer circuit (47) measures a lapsed time to produce a time up signal when the lapsed time is equal to an integral multiple of a predetermined time interval. Responsive to the time up signal, a supplying section (49) alternately supplies first and second carrier signals indicative of first and second memorized frequency signal preliminarily memorized in a memorizing section (48), respectively, one at a time as the reception carrier signal to the converting unit.
600761
Corporation Nec
Smart & Biggar
LandOfFree
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