| 摘要 |
PURPOSE:To restraint unnecessary radiation from a cable for signal transmission by wiring a cable for carrier wave that transmits a non-modulated signal having the same frequency with the carrier for signal transmission and greater power than signal transmitting power, near a cable for signal transmission. CONSTITUTION:A non-modulated signal of frequency f1 and power P2(P2>P1) is sent out from a carrier generator 13 to a cable 14 for carrier wave when a main unit 1 and a terminal 2 are transmitting and receiving at frequency f1, and power P1 using a cable 12 for signal transmission. The cable 14 shields the cable 12 and one end is grounded near the terminal and other end is released. Unnecessary radiation waves from the cable 12 is restrained by stronger radiation waves from the cable 14. Since radiation waves from the cable 14 is non- modulated, no influence is exerted by audible sound. |
