| 摘要 |
PURPOSE:To simplify wirings to improve reception characteristics by providing an antenna switching part, a tuning control part, and an amplifying part, which are controlled through one optical fiber cable by a receiver body, near a pair of glass antennas. CONSTITUTION:A pair of glass antenna patterns 11a and 11b are buried in a rear glass 11 of a vehicle. An antenna switching and amplifying part 12 having a diversity antenna switching part 13, an input tuning circuit 14, an RF amplifier 15, and a decoder 17 is provided near these antenna patterns. Signals are sent from a receiver body 18 provided on a dashboard through one optical fiber cable. Signals are encoded in an encoder 22 by the AGC signal from an RF part 19 and the output from an IF demodulating part 20 and are inputted to the optical fiber, and diversity switching is set through the decoder 17 to control the input tuning circuit 14 and the RF amplifier 15. Thus, wirings are simplified, and reception characteristics in strong and weak electric field regions are improved to enhance the noise eliminating capability. |
