| 摘要 |
PROBLEM TO BE SOLVED: To provide some reception stages in common to all reception modes and to produce superior effects in each reception mode. SOLUTION: The receiver is provided with a 1st down-converter stage consisting of low-noise amplifiers 2, 15, local oscillators 4, 16 and mixers 3, 17 and a 2nd down-converter stage consisting of a local oscillator 7, mixers 5, 6, and phase shifters 8, 9 and in common to all modes and can receive radio waves in all the reception modes without using SAW filters. |
