| 摘要 |
PURPOSE:To obtain a required noise figure, and to reduce the consumption of electric power and to improve frequency stability, by inputting the output of the 1st mixer to the 2nd mixer through the 1st band pass filter, the 1st intermediate frequency amplifier and the 2nd band pass filter. CONSTITUTION:An input 15 from a tuner is fed to an output terminal 29 through a filter circuit 16, a wide band variable attenuator 17, a wide band amplifier 18, the 1st mixer 19, the 1st band pass filter 22, the 1st intermediate frequency amplifier 23, the 2nd band pass filter 24, the 2nd mixer 26, and the 2nd intermediate frequency amplifier 28. |
