Electronic Communications Systems Tomasi Chapter 7 And 8

47 Questions  I  By [email protected] on October 5, 2012
Electronic communications systems subject

  
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1.  In PM, the higher is the peak amplitude of the modulating signal, the higher is the ____
2.  __________ is varying the phase of a constant amplitude carrier directly proportional to the amplitude of the modulation signal at a rate equal to the frequency of the modulating signal
3.  In angle modulation, all transmitted power in FM are useful, making it more ______
4.  In PM, when the carrier signal is not modulated, its frequency is constant and is equal to the ________
5.  Direct frequency modulation is varying the frequency of a constant amplitude carrier _____ ______ to the amplitude of the modulating signal at a rate equal to the frequency of tthe modulating signal.
6.  Angle modulated signals are more _________
7.  In angle modulation, _____ bandwidth is needed compared to AM
8.  ____ is the precise phase of the carrier at a given instant of time
9.  For FM broadcasts, ______ is used, so that the radius of operation is limitted slightly more than line of sight
10.  In PM, the peak phase deviation occurs when the _____ of the modulating signal is at its peak.
11.  FM receivers can be fitted with amplitude limiters to remove amplitude variations caused by noise, making FM more immune to noise. This is called __ ________
12.  If the modulating signal ______ the frequency directly, frequency modulation results
13.  Amplitude of FM and PM remains _____
14.  In FM, the higher is the modulating signal voltage, the higher is the _____
15.  Results whenever the phase angle of a sinusoidal wave is varied with respect to tiime
16.  When _____ of a signal is varied, it's phase is also varied
17.  In Angle modulation, since reception is limitted in line of sight, the area of reception is much _____ than AM.
18.  In __, once the signal has been contaminated by noise, noise cannot be removed
19.  _____ can be improved further by increasing the frequency deviation of FM signals
20.  In PM, when the carrier signal is modulated by a modulating signal, its ________ will change depending on the instantaneous value of the modulating signal voltage.
21.  The ______ between frequency and phase modulation lies in which property of the carrier is directly varied by the modulating signal.
22.  FM has the ability to ______ _____, which is probably the biggest advantage of FM compared to AM
23.  In capture effect, the signals ratio, one of the signals is _____ as high as the other. 
24.  Standard frequency allocations provide ______ between FM broadcast stations, so there is less adjacent channel interference.
25.  Direct frequency modulation is varying the frequency of a ______ amplitude carrier directly proportional to the amplitude of the modulating signal at a rate equal to the frequency of the modulating signal.
26.  If the modulating signal varies the phase directly, ___ ____ results.
27.  _____ improves system fidelity
28.  Standard frequency allocations provide guard band between FM broadcast stations, so there is ____ adjacent channel interference
29.  For FM broadcasts, several independent transmitters separated by space can use  the ____ frequency with less possible interference
30.  In angle modulation, there is ____ complex circuits than in AM
31.  There is ____ noise in MF and HF than in VHF and UHF
32.  In PM, the higher is the modulating signal voltage the higher is the ______
33.  If the modulating signal varies the frequency directly, _____ ______ results
34.  FM receivers can be fitted with _____ ______ to remove amplitude variations caused by noise, making FM more immune to noise.
35.  Angle Modulation results whenever the _________ of a sinusoidal wave is varied with respect to time
36.  Reduced noise improves _____
37.  Signal to noise ratio can be improved further by increasing the ______ of FM signals
38.  For FM, the radius is limitted more than line of _____
39.  The two forms of angle modulation are ________ and ________
40.  In angle modulation, _____ may be used, but all subsequent can be class C and therefore more power efficient
41.  The difference between frequency and phase modulation lies in which property of the carrier is ____ _____ by the modulating signal
42.  _______ is varying the frequency of a constant amplitude carrier directly proportional to the amplitude of the modulating signal at a rate equal to the frequency of the modulating signal
43.  In PM, while the phase of the carrier is changing, its frequency will also be changing. _____ FM will result
44.  Amplitude is _____ of modulation depth
45.  In FM, when the carrier signal is modulated by a modulating signal, its instantaneous frequency will change depending on the ______ of the modulating signal
46.  ____ indicates how much phase of the carrier is changing with respect to its reference phase.
47.  With FM and PM, a phenomenon known as _____ allows a receiver to differentiate between two signals with the same frequency
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