Exam 3: Radio Transmission and Modulation Techniques

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

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

Under ordinary circumstances, impulse noise can be reduced in

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

A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be

In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

What is the purpose of peak clipper circuits in radio transmitters?

Which of the following is used to generate PDM?

The disadvantage of FM over AM is that

If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.

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

In EM waves, polarization

FM transmitting and receiving equipment as compared to AM equipment is

PAM stands for

A buffer amplifier is

Which of the following is a digital modulation technique?

Which one of the following is analog?

In a FM receiver, amplitude limiter

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

It is found that a ship to ship communication suffers from fading. This can be avoided by using