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 200

200 and 100.1

200 and 1.01

200 and 10.01

200 and 200

200 and 100.1

200 and 1.01

200 and 10.01

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Communication Systems
Leak type bias is used in plate modulated class C amplifier to

Prevent tuned circuit damping

Prevent excessive grid current

Increase the bandwidth

Prevent over modulation

Prevent tuned circuit damping

Prevent excessive grid current

Increase the bandwidth

Prevent over modulation

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Communication Systems
For telegraphy the most commonly used modulation system is

Two tone modulation

Single tone modulation

PCM

FSK

Two tone modulation

Single tone modulation

PCM

FSK

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Communication Systems
The main function of a balanced modulator is to

Produce 100% modulation

Produce balanced modulation of a carrier wave

Limit noise picked by a receiver

Suppress carrier signal in order to create a single-sideband or double sideband

Produce 100% modulation

Produce balanced modulation of a carrier wave

Limit noise picked by a receiver

Suppress carrier signal in order to create a single-sideband or double sideband

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Communication Systems
VSB modulation is preferred in TV because

None of these

It reduces the bandwidth requirement to half

It avoids phase distortion at low frequencies

It results in better reception

None of these

It reduces the bandwidth requirement to half

It avoids phase distortion at low frequencies

It results in better reception

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Communication Systems
If output power of a radio receiver is doubled, its volume is increased by __________ dB.

3

1

-3

2

3

1

-3

2

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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 Leak type bias is used in plate modulated class C amplifier to

Communication Systems For telegraphy the most commonly used modulation system is

Communication Systems The main function of a balanced modulator is to

Communication Systems VSB modulation is preferred in TV because

Communication Systems If output power of a radio receiver is doubled, its volume is increased by __________ dB.

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
Leak type bias is used in plate modulated class C amplifier to

Communication Systems
For telegraphy the most commonly used modulation system is

Communication Systems
The main function of a balanced modulator is to

Communication Systems
VSB modulation is preferred in TV because

Communication Systems
If output power of a radio receiver is doubled, its volume is increased by __________ dB.