Electronic Communications Systems Tomasi Chapter 7 And 8

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Electronic communications systems subject

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