《无线电基础》复习题目.docx.pdf
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1、无线电基础复习题目 This article is contributed by wx4040 DOC documents may experience poor browsing on the WAP side? It is recommended that you first select TXT, or download the source file to the local view. “Radio Basics“ review information 1, fill in the blanks (10) 1,the human ear can hear the sound (lan
2、guage or voice) frequency in the range of 20Hz to 20KHz? Outer layer propagation. Outer bulb layer 2,the radio wave propagation mode ground wave ground wave propagation, wave propagation, wave wave and grotmd wave wave wave spacewave propagation 3,the frequency range of medium wave is 300K 一3000K, a
3、nd the frequency range of short wave is 3M 一30M. 4, antenna device to receive electromagnetic wave radiation, its main parameters are in put impedance radiati on or receiving the input impedance and input impedanee of the antenna radiation efficiency, the half power angle and field ratio, gain frequ
4、ency characteristics etc? The gain and frequency characteristics, the anterma efficiency, the half power angle, the field strength ratio before and after the F/B, the gain frequency characteristic, the half power an gle 5, the comm on transmission lines have parallel two-wire transmission lines and
5、coaxial parallel two-wire coaxial transmission lines ?Parallel coaxial 6, factor of quality used to indicate selectivity or selectivity of a resonant circuit?The greater the Q value, the better the selectivity; the smaller the Q value, the poorer the selectivity of the election. 7, a parallel resona
6、nt circuit is in resonance circuit, impedance LC parallel circuit at both ends of a pure resistance resistance, resistanee and pure resistance minimum, maximum current maximum inductance and capacitor branch, therefore is called the current resonance? Maximum resistance; minimum total current; maxim
7、um 8; amplifiers with a working frequency above 100K are high frequency amplifiers?9、amplifier with frequency selective amplification is called frequency selective amplifier? Because it uses the resonant characteristics of the LC resonant circuit to select frequency, so it is also called tuned ampli
8、fier? 10、double tuning amplifier circuit has two coupling modes, inductance, coupling and capacitance coupling? Inductive coupling and capacitive coupling inductance coupling 11, low frequency power amplifier using a or B class amplifier working in the linear form, linear state; and the class C ampl
9、ifier, working in nonlinear state ?The high frequency power amplifier, class C, 12 commonly used nonlinear surface acoustic wave filter has the advantages of small size, light weight, high reliability, good uniformity of light weight, high reliability, good consistency and is made of solid etc? 13,
10、quartz crystal resonator is the biggest characteristic of Q is very high, up to tens of thousands, even millions, tens of thousands, or even more than mill ion. A solid circuit 14, ceramic filter, and use it to replace the LC filter with high quality factor, good filtering characteristics, high qual
11、ity factor, good filtering characteristics, high quality factor does not need to adjust, not by magnetic interference, not afraid of vibration, small portable cheap service life long - long life and other characteristics? Do not need to be adjusted, not by magnetic interference, vibration resistance
12、, small lightweight and inexpensive long service life adjustment 15, according to the different modulation signal to the transistor electrode points, modulation can be divided into three categories: base emitter base modulation, modulation, modulation and base collector modulation modulation and col
13、lector modulation? 16. According to the theoretical formula, A single channel FM broadcast receiver has a bandwidth of 180KHZ before demodulation stage and a bandwidth of 130KHZ for television audio. 17, the state stipulates that the bandwidth of the TV sound is 250KH乙.1& FM has direct FM and indire
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