| 摘要 |
PROBLEM TO BE SOLVED: To transmit a plurality of satellite signals subjected to frequency conversion on one transmission line. SOLUTION: A mixer 10 performs frequency conversion of first and second satellite signals coming from a first geostationary satellite and having planes of polarization different from each other and identical or overlapping frequency bands to generate a first intermediate frequency signal. A mixer 26 performs frequency conversion of third and fourth satellite signals coming from a second geostationary satellite and having planes of polarization different from each other and an identical frequency band, and fifth and sixth satellite signals coming from a third geostationary satellite and having planes of polarization different from each other and a frequency band identical to that of the third and fourth satellite signals to generate a second intermediate frequency signal. The first and second intermediate frequency signal are mixed and supplied to one output terminal 36. Depending on the control signal supplied to the output terminal 36, LNA 4R or 4L operates to select and supply one of the first and second satellite signals to the mixer 10, and one of LNA 18V, 18H, 20V and 20H operates to select and supply one of the third through sixth satellite signals to the mixer 26. COPYRIGHT: (C)2007,JPO&INPIT
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