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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
To eliminate ghosts in the picture

Change the antenna orientation of location
Twist the transmission line
Use a longer transmission line
Connect a booster

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Communication Systems
SSB can be generated by

All of these
Phase cancellation method
Filter method
Good attenuation characteristics

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Communication Systems
A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

8
16
15
1

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Communication Systems
A cordless telephone using separate frequencies for transmission in base and portable units is known as

Either A or B
Half duplex arrangement
Duplex arrangement
Neither A nor B

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Communication Systems
A woofer should be fed from the input through a

Band stop filter
Band pass filter
Low pass filter
High pass filter

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