| 摘要 |
PROBLEM TO BE SOLVED: To obtain a television community reception system that can community- receive all bands of ground television broadcast and satellite broadcast programs through one coaxial cable. SOLUTION: A signal received by a BS antenna 5 is converted into a signal with an intermediate frequency band by a BS converter 6. A signal by a CS antenna 8 is given to a polarization coupler 9, where the signal is converted into a left-handed circularly polarized wave and a right-handed circularly polarized wave and they are converted into intermediate frequency signals by a left-handed circularly polarized wave converter 10 and a right-handed circularly polarized wave converter 11, respectively. Furthermore, an output signal from the right-handed ciruclarly polarized wave converter 11 is given to a block converter 12, which converts the signal into an upper frequency band of the left-handed circularly polarized wave frequency band, the result is given to a mixer 13, where the converted signal is mixed with the signal of the intermediate frequency band of the CS left-handed circularly polarized wave. The signal mixed by the mixed 13 is given to a mixer 7, where the signal is mixed with the signal of the BS intermediate frequency band, a mixer 4 mixes the mixer signal with a VHF, UHF signal, the mixed signal is amplified by a broadband amplifier 14 and the amplified signal is transmitted to a terminal through one cable.
|
