| 摘要 |
PROBLEM TO BE SOLVED: To receive airwaves that are multiplexed by right- and left-handed circularly polarized waves for distribution to each terminal device through one IF signal cable, in a community receiving system. SOLUTION: The right- and left-handed circularly polarized waves are converted into IF signals, each having different frequency by means of low-noise converters 52 and 53, and then are mixed by a mixer 54. Additionally, these signals are mixed with terrestrial television broadcast signals by a mixer 56 and are distributed to each terminal device 2 through one IF signal cable. In the terminal device 2, the signals are supplied to a receiver 61, after the terrestrial television broadcast signals have been separated by a branching filter 59. A selection circuit 60 selects the right- and left-handed circularly polarized wave components, based on the polarization switching signal supplied from the receiver 61 for supplying to the receiver 61, after performing frequency conversion, as required. COPYRIGHT: (C)2006,JPO&NCIPI
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