| 摘要 |
PURPOSE:To transfer economically information wirelessly by connecting a control section controlling an input signal, a transmission section and an antenna changeover switch section in order in a means for transferring a semiduplex signal in a wireless way while the antenna changeover switch section, a reception section and the control section are connected in order. CONSTITUTION:When an antenna feeding switch is set and a power supply of an oscillation section is applied, the upper line coupling the control section 21, the transmission section 22, the antenna changeover switch section and a whip antenna 24 is activated and the lower line tying the antenna changeover switch section 23, the reception section 25 and the control section 21 is dead. Then a transmitted data signal is fed, an oscillator output is set and the modulated high frequency signal goes to the antenna switch to start transmission. In case of the reception, conversely as above, the signal is turned off, an Ant SW is turned off, an Ant SW reception is turned, and when the oscillator output is zero, the lower line in figure is live, the incoming radio wave is detected and the radio wave entering through the converter is given to a main body while being converted into an RS-232C level. |
