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Communication Systems

Communication Systems
The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

50 kW
20 kW
0.5 kW
8 kW

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Communication Systems
PAM stands for

Pulse Analogue Modulation
Phase Amplitude Modulation
Pulse Amplitude Modulation
Phase Analogue Modulation

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Communication Systems
For a low level AM system, the amplifiers modulated stage must be

Harmonic devices
Linear devices
Class C amplifiers
Non-linear devices

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Communication Systems
If sampling is done at the rate of 10 kHz. The bandwidth required is

70 kHz
35 kHz
1280 kHz
10 kHz

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Communication Systems
Which of the following is used to generate PDM?

Free running multi-vibrator
Schmitt trigger
Monostable multi-vibrator
JK flip-flop

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Communication Systems
The disadvantage of FM over AM is that

High output power is needed
High modulating power is needed
Large bandwidth is required
Noise is very high for high frequency

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