| 摘要 |
PURPOSE: To avoid interference between adjacent devices by effectively transmitting and receiving signals by providing symmetrical axial lines for transmitter and receiver antennas concerning the lengthwise propagation of signals and mutually lining up both antennas. CONSTITUTION: At a receiver module 12, a clamp 19 for handle mount and a receiver antenna 17, and the receiver antenna 17 is positioned at a pivot 'P' concerning an adjustable angle 18 and lined up with the transmitter antenna. On the other hand, a transmitter module 20 is provided with a clamp 22 for frame mount. This clamp 22 is fitted on a front side 13 or a rear side 14 of frame of a bicycle by screws and nuts 21. Then, by fastening or unfastening the screws and nuts, the transmitter antenna 28 is turned within an adjust angle range 23 and lines up the axial line with the receiver antenna 17. |
