Modulation (AM/FM/PM), bandwidth, ground/space wave propagation.
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Q1 · Communication Systems (Class 12) · EASY
In amplitude modulation, a carrier wave of frequency 1 MHz is modulated by an audio signal of frequency 5 kHz. The bandwidth of the amplitude modulated wave is:
Q2 · Communication Systems (Class 12) · MEDIUM
A ground wave of frequency 2 MHz travels along the surface of the earth. If the radius of the earth is 6400 km and the height of transmitting antenna is 80 m, what is the maximum distance up to which the wave can be received? (Take the formula: d = square root of (2 × R × h) where R is radius of earth and h is antenna height)
Q3 · Communication Systems (Class 12) · MEDIUM
A modulating signal is a square wave with amplitude 5 V and frequency 1 kHz. The carrier wave has amplitude 10 V and frequency 100 kHz. If this signal is amplitude modulated, the modulation index is:
Q4 · Communication Systems (Class 12) · MEDIUM
A carrier wave has a peak voltage of 20 V and is used to transmit a message signal with a modulation index of 60%. What is the peak voltage of the modulating signal?