An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

Communication Systems
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

200 and 10.01

200 and 100.1

200 and 1.01

200 and 200

200 and 10.01

200 and 100.1

200 and 1.01

200 and 200

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Communication Systems
In Modulation, “carrier” is

Voltage with constant frequency, phase or amplitude

Voltage for which frequency, phase or amplitude is varied

Resultant wave

Speech voltage to be transmitted

Voltage with constant frequency, phase or amplitude

Voltage for which frequency, phase or amplitude is varied

Resultant wave

Speech voltage to be transmitted

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Communication Systems
Skip distance depends on time of day and angle of incidence.

False

True

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Communication Systems
In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

Non-linear devices

Harmonic devices

Class C amplifiers

Linear devices

Non-linear devices

Harmonic devices

Class C amplifiers

Linear devices

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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

Neither A nor B

Half duplex arrangement

Duplex arrangement

Either A or B

Neither A nor B

Half duplex arrangement

Duplex arrangement

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Communication Systems
The characteristic impedance of a twin wire feeder used for TV signals is about

300 ohm

500 ohm

1000 ohm

100 ohm

300 ohm

500 ohm

1000 ohm

100 ohm

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Communication Systems

Communication Systems An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

Communication Systems In Modulation, “carrier” is

Communication Systems Skip distance depends on time of day and angle of incidence.

Communication Systems In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

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

Communication Systems The characteristic impedance of a twin wire feeder used for TV signals is about

Communication Systems
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

Communication Systems
In Modulation, “carrier” is

Communication Systems
Skip distance depends on time of day and angle of incidence.

Communication Systems
In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

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

Communication Systems
The characteristic impedance of a twin wire feeder used for TV signals is about