| 摘要 |
PURPOSE:To cope assuredly with the ON/OFF of a carrier due to voice activation, by transferring frequency designating digital data via a control line and in the form of a local signal of a frequency converter. CONSTITUTION:For the output of a frequency converter 7, a wave detection is carried out by a wave detector 10 and via a BPF9 and only the output corresponding to the carrier level of a specific channel decided by the frequency of a frequency synthesizer 80 is selected. This output is converted into the digital information by an A/D converter 20 and fed to a microcomputer 30. The computer 30 feeds a data to the synthesizer 80 via a control line 300 to designate the oscillation frequency. Furthermore, the computer 30 supplies a data for control of transmitting power obtained from an internal operation to a D/A converter 40. This data is converted into the corresponding voltage and supplied to a variable attenuator 4 via a voltage/current converter 60 and a line 100. |
