| 摘要 |
A control signal indicating the reception level by a receiver (15) of the electric waves for satellite broadcasting is supplied over a signal cable (13) interconnecting the satellite antenna (11) and the receiver (15) to a reception level indicator (14) provided on the cable (13) in the vicinity of the satellite antenna (11) so that the reception level indication may be viewed in the vicinity of the satellite antenna (11). The control signal is the signal modulating the voice sampling clocks as a carrier wave, which voice sampling clocks are high-frequency signals reproduced in the receiver (15). The result is that the satellite antenna may be installed easily and the necessity of providing a carrier wave oscillator for generating the carrier wave may be eliminated to achieve reduction of costs. <IMAGE> |
