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高频填空

高频填空
高频填空

1.并联谐振回路作为负载时常采用抽头接入的目的是()。

2.调制与解调都是()过程,所以必须用()器件才能完成。3.调频波中的载波分量功率()未调载波功率,标准调幅波中的载波分量功率()未调载波功率。

4.谐振功率放大器的三种工作状态为()、()、(),一般工作在()工作状态,集电极调幅时应工作在()工作状态。

5.单边带通信的优点是(),若需提高单边带发射频率,可采用()方法。

6.混频时将晶体管视为()元件,混频器的干扰主要有()、()、()、()。

7.高频小信号放大器中,不能一味追求大的放大倍数的原因是()。8.振荡器的频率稳定度是指(),按时间可分为()三种。9.超外差式接收机中,天线收到的高频信号经()、()()、()后送人低频放大器的输入端。

10.一个完整的通信系统由()、()和()组成。11.在串联型晶体振荡器中,晶体作为()元件使用,在并联型晶体振荡器中,晶体作为()元件。

12.影响小信号谐振放大器稳定工作的主要因素是(),常用的稳定措施有()和()。

13.和振幅调制相比,角度调制的主要优点是()强,因此它们在通信中获得了广泛的应用。

14.构成正弦波振荡器必须具备的三个电路条件是()、()和()。

15.C类高频功率放大器,其输出电压波形为正弦波的原因是(),其工作状态可分为()、()和()。16.高频功率放大器工作在临界状态,当电压参数不变时,若RL减小,则直流(),输出功率();此时若通过改变Ec使放大器重新回到临界状态,则Ec应()。

17、电视广播占用频段的频率范围是()。

18、某调频电路,其最大频偏为10KHz,调制信号频率范围为300Hz到3KHz。

其已调FM信号的频宽为()。

19、一普通调幅发射机输出功率为50W,其载波功率为45W。则调幅系数

为(),边带功率为()。

20、某接收机fi=200 KHz,fL=500 KHz,fR=300 KHz。此时的镜频干扰

频率为()。

21、模拟通信系统中调频比调相应用得广泛的主要原因是()。

参考答案:

1.①为了减小信号源内阻和负载对回路的影响;

2.①频率变换的,②非线性

3.①小于;②等于

4.①欠压工作状态;②临界工作状态;③过压工作状态;④临界;⑤过压;

5.①节省功率,节省频带,抗选择性干扰能力强,信噪比高;②倍频、混频。

6.①线性参变;②组合频率干扰、副波道干扰、倒易混频

7.①避免放大器自激,使放大器稳定工作(放大倍数与稳定系数成反比) 8.①在一定时间间隔里,频率准确度变化的最大值;②瞬间频率稳定度、短期频率稳定度、长期频率稳定度

9.①高频小信号放大器;②变频器;③中频放大器;④检波器

10.①发送设备,②传输媒质,③接收设备

11.①短路,②电感

12.①Cbe的存在;②中和法;③失配法

13.抗干扰能力

14.①振荡回路;②能量来源;③控制设备(有源器件和正反馈电路)

15.①负载为LC选频回路;②欠压,③临界,④过压

16.①不变:②减小;③减小

17.VHF、UHF

18.26 KHZ

19.0.47,5W

20.700KHZ

21.调频为恒带调制,调相波的带宽随调制信号的频率变化。即调频制的

频带利用较调相制经济。

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