| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission system of radio signal for automobile in which the effect of noise is suppressed in the AM band and FM band, respectively, when a coaxial cable is employed in the transmission line of radio signal. SOLUTION: In the transmission system of radio signal for automobile where an antenna amplifier 2 for amplifying the signal from an unearthed antenna 1 being mounted on an automobile is connected with a radio receiver 4 through a coaxial cable 3, the outer conductor 3a of the coaxial cable 3 at the radio receiver side end 3c is earthed to the body earth 6 of the automobile, and the outer conductor 3a of the coaxial cable 3 at the antenna amplifier side end 3d is earthed to the body earth 6 through a circuit element 7 becoming high impedance in AM receiving frequency band and becoming low impedance in FM receiving frequency band. COPYRIGHT: (C)2006,JPO&NCIPI
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