| 摘要 |
The system processes the operation data of automobile tachometer by using wireless data communication modem. The system includes a transmitting unit, a receiving unit, and an interface unit. The transmitting unit includes a second modulation signal oscillation unit(50), a first modulation signal input unit(52), a demodulation and transmitting frequency oscillation unit(54), a frequency multiplying unit(56), and an antenna unit(57) and a control unit(58) for transmitting and receiving. The receiving unit includes a first amplifier unit(62), a receiving amplifier unit(63), an IF amplifier unit(64), a receiving wave detection unit(65), a second modulation frequency detection unit(67), and a first modulation signal output unit(69). The interface unit includes RS-232C interface unit(70), a transmitting and receiving control unit(72), a receivable control unit(74), and a level compensating unit(76).
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