| 摘要 |
PROBLEM TO BE SOLVED: To convert the frequencies of multiple satellite signals of different frequency bands transmitted from the same satellite orbit despite of one frequency converter for antenna for satellite signal receiving. SOLUTION: A BS signal and a right turning CS signal have different frequency bands but have the same plane of polarization and right turning and left turning CS signals have the same frequency band but have different planes of polarization. The BS signal and the right turning CS signal are provided from a probe 4R. The left turning CS signal is provided from another probe 4L. A mixer 12 converts the frequencies of the BS signal and the right turning CS signal to the signals of respectively different frequency bands and converts the frequencies of the right turning and left turning CS signals to the same frequency band. The output signal of the mixer 12 is supplied to an output terminal 20. When a voltage supplied from the outside to the output terminal 20 is +15 V, a voltage comparator 24 operates an LNA 6R for right turn and supplies the BS signal and the right turning CS signal to the mixer 12. When the voltage of the output terminal 20 is +11 V, the voltage comparator 24 operates an LNA 6L for left turn and supplies the left turning CS signal to the mixer 12.
|
