| 摘要 |
PURPOSE:To attain addition/subtraction of an operating frequency in an optional unit by providing a digit register, an addition/subtraction pulse transmission means and a digit designation means in a frequency selection circuit for radio communication equipment. CONSTITUTION:A digit designation button 17 on an operation panel 1 is depressed and the operating position is moved sequentially from the least significant bit to the most significant bit by a digit designation ring counter Qa. The designated digit is displayed on a display device 2. In depressing a frequency selection addition button 16, an addition pulse is fed to a terminal U of the digit register Q via a designated switch among digit designation switches S1 S9. In depressing once a frequency selection subtraction button 15 similarly, one subtraction pulse to a terminal D of the digit register Q is fed. The counter value of digit registers Q1 Q9 is displayed on the display device 2. The operting frequency is selected with the operating method having the same logical structure independently of the increment/decrement unit of the operating frequency so as to improve the operability. |
