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1-1 调谐器一般由哪几部分组成? 答:调谐器一般指全频道调谐器,由VHF和UHF两个独立的调谐器组合电成.两调谐器均由输入电路、高频放大、混频和本机振荡四部分电路组成. 1-2 试述输入电路的任务和要求. 答:输入电路有两个任务:将电视天线上获得的信号功率传递给高放管;抑制中频干扰和像频干扰.因此,对输入电路有两项要求:电路的输入端应与天线馈线匹配,电路的输出端应与高放输入端匹配;在保证8
1-1 tuner generally consists of several parts? A: The tuner generally refers to all-channel tuner, VHF and UHF by two independent tuners combined into two tuners by the input circuit, high-frequency amplification, mixed Frequency and local oscillation circuit composed of four parts .1-2 try out the input circuit tasks and requirements. A: The input circuit has two tasks: the TV antenna to obtain the signal power delivered to the high tube; suppress the intermediate frequency interference and image Frequency interference.Therefore, there are two requirements for the input circuit: the input of the circuit should be matched with the antenna feeder, the output of the circuit should be matched with the high input of the amplifier,