| 摘要 |
PROBLEM TO BE SOLVED: To output a selected one among plural ultra high frequency signals to an output terminal with a simple configuration. SOLUTION: A satellite broadcast intermediate frequency signal BS-IF and satellite communication intermediate frequency signals CS-IF1, CS-IF2 are fed to input terminals 45, 46, 47. After the signal BS-IF is amplified by an amplifier 62, mixed with VHF band and UHF band television broadcast signals by a mixer 52 and the mixed signal is distributed by a distributor 76 and fed to mixers 78, 80. On the other hand, the signals CS-IF1, CS-IF2 are frequency- converted into signals CS-IF1a, CS-IF2a by block converters 68, 74 and fed to the mixers 78, 80. Outputs of the mixers 78, 80 are distributed by 4- distributors 82, 92 and fed to fixed contacts 84a, 86a, 88a, 90a; 84b, 86b, 88b, 90b of changeover switches 84, 86, 88, 90. Moving contacts 84c, 86c, 88c, 90c of the changeover switches 84, 86, 88, 90 are changed over in response to a DC voltage fed to output terminals 92, 94, 96, 98. |
