Electronic Communications Systems Tomasi Chapter 7 And 8

47 Questions  I  By Xavbeler77
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1.  Reduced noise improves _____
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, there is ____ complex circuits than in AM
4.  Standard frequency allocations provide guard band between FM broadcast stations, so there is ____ adjacent channel interference
5.  The difference between frequency and phase modulation lies in which property of the carrier is ____ _____ by the modulating signal
6.  Signal to noise ratio can be improved further by increasing the ______ of FM signals
7.  Angle modulated signals are more _________
8.  With FM and PM, a phenomenon known as _____ allows a receiver to differentiate between two signals with the same frequency
9.  In FM, when the carrier signal is modulated by a modulating signal, its instantaneous frequency will change depending on the ______ of the modulating signal
10.  In FM, the higher is the modulating signal voltage, the higher is the _____
11.  In angle modulation, _____ bandwidth is needed compared to AM
12.  Standard frequency allocations provide ______ between FM broadcast stations, so there is less adjacent channel interference.
13.  For FM broadcasts, several independent transmitters separated by space can use  the ____ frequency with less possible interference
14.  _______ 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
15.  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.
16.  ____ indicates how much phase of the carrier is changing with respect to its reference phase.
17.  If the modulating signal ______ the frequency directly, frequency modulation results
18.  The ______ between frequency and phase modulation lies in which property of the carrier is directly varied by the modulating signal.
19.  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.
20.  If the modulating signal varies the frequency directly, _____ ______ results
21.  In angle modulation, all transmitted power in FM are useful, making it more ______
22.  For FM, the radius is limitted more than line of _____
23.  FM has the ability to ______ _____, which is probably the biggest advantage of FM compared to AM
24.  FM receivers can be fitted with amplitude limiters to remove amplitude variations caused by noise, making FM more immune to noise. This is called __ ________
25.  In PM, when the carrier signal is not modulated, its frequency is constant and is equal to the ________
26.  Amplitude is _____ of modulation depth
27.  In Angle modulation, since reception is limitted in line of sight, the area of reception is much _____ than AM.
28.  In PM, the peak phase deviation occurs when the _____ of the modulating signal is at its peak.
29.  There is ____ noise in MF and HF than in VHF and UHF
30.  In angle modulation, _____ may be used, but all subsequent can be class C and therefore more power efficient
31.  FM receivers can be fitted with _____ ______ to remove amplitude variations caused by noise, making FM more immune to noise.
32.  In PM, while the phase of the carrier is changing, its frequency will also be changing. _____ FM will result
33.  In PM, the higher is the modulating signal voltage the higher is the ______
34.  In __, once the signal has been contaminated by noise, noise cannot be removed
35.  In PM, the higher is the peak amplitude of the modulating signal, the higher is the ____
36.  In capture effect, the signals ratio, one of the signals is _____ as high as the other. 
37.  For FM broadcasts, ______ is used, so that the radius of operation is limitted slightly more than line of sight
38.  The two forms of angle modulation are ________ and ________
39.  _____ can be improved further by increasing the frequency deviation of FM signals
40.  ____ is the precise phase of the carrier at a given instant of time
41.  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.
42.  _____ improves system fidelity
43.  When _____ of a signal is varied, it's phase is also varied
44.  Angle Modulation results whenever the _________ of a sinusoidal wave is varied with respect to time
45.  Results whenever the phase angle of a sinusoidal wave is varied with respect to tiime
46.  If the modulating signal varies the phase directly, ___ ____ results.
47.  Amplitude of FM and PM remains _____
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