| 摘要 |
PURPOSE:To delete a difficult adjustment and to stabilize a gain to a center frequency in the range of the resolution of a digital/analog converter by providing a storing means for storing correction data for correcting a frequency characteristic, the digital/analog converter and a variable gain amplifier. CONSTITUTION:A local oscillating frequency generating means 28 outputs the digital value of the center frequency of a current transmitter and a microcomputer 27 inputs it through an input means 23. Based on this value, the microcomputer 27 reads control data from a read only memory 24 to transfer to the digital/analog converter 25 and the digital/analog converter 25 drives the variable gain amplifier 26. Such an operation is carried out and gain correcting data in the respective center frequencies is stored in the read only memory 24. Thereby, the transmitter stable in the gain to the change in the center frequency can be constituted.
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