Recent questions tagged communication-systems

Match the following for a FM Wave:

asked Jul 13, 2014 by balaji.thirumalai

1 answer

What are the minimum and maximum Amplitude of an AM wave represented by the expression: $v = 5(1+0.6\cos 6280 t) \sin 211 \times 10^4 \; \text{volts}$?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

What are the three frequencies of an AM wave represented by the expression: $v = 5(1+0.6\cos 6280 t) \sin 211 \times 10^4 \; \text{volts}$?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

An AM signal is represented by the equation $25+5\sin (2\pi\times 8\times 10^3\;t) \times \sin (2\pi\times 0.25\times10^6\;t)$. Calculate the bandwidth, the modulating factor and the amplitude of each side frequency?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

An AM signal is represented by the equation $10+4\sin (2\pi\times 3\times 10^3\;t) \times \sin (2\pi\times 0.3\times10^6\;t)$. Calculate the bandwidth, the modulating factor and the amplitude of each side frequency?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmission tower at a particular place has a height of 135m. (A) What is its coverage range? (B) By how much should the height be increased to 2 times its coverage range? Given that radius of earth = 6400 km.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmission tower at a particular place has a height of 200m. (A) What is its coverage range? (B) By how much should the height be increased to 1.4 times its coverage range? Given that radius of earth = 6400 km.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmission tower at a particular place has a height of 150m. (A) What is its coverage range? (B) By how much should the height be increased to 1.2 times its coverage range? Given that radius of earth = 6400 km.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmission tower at a particular place has a height of 176m. (A) What is its coverage range? (B) By how much should the height be increased to 1.25 times its coverage range? Given that radius of earth = 6400 km.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmitter puts out a total power of 24 Watts of 43% AM signal. Calculate how much power is contained in each of the sidebands and the fraction of power in the carrier.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmitter puts out a total power of 40 Watts of 30% AM signal. Calculate how much power is contained in each of the sidebands and the fraction of power in the carrier.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmitter puts out a total power of 40 Watts of 30% AM signal. Calculate how much power is contained in each of the sidebands and the fraction of power in the carrier.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmitter puts out a total power of 15 Watts of 16% AM signal. Calculate how much power is contained in each of the sidebands and the fraction of power in the carrier.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmitter puts out a total power of 32 Watts of 28% AM signal. Calculate how much power is contained in each of the sidebands and the fraction of power in the carrier.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A transmitter puts out a total power of 25 Watts of 30% AM signal. Calculate how much power is contained in each of the sidebands and the fraction of power in the carrier.

asked Jul 12, 2014 by balaji.thirumalai

1 answer

An AM signal is represented by the equation $15+3\sin (2\pi\times 5\times 10^3\;t) \times \sin (2\pi\times 0.5\times10^6\;t)$. What is the amplitude of each side frequency?

asked Jul 12, 2014 by balaji.thirumalai

1 answer

When 80% AM is transmitted total power is 10kW. What is the power saved if the carrier and one side band are suppressed?

asked Jul 12, 2014 by balaji.thirumalai

1 answer

A standard AM broadcast station is allowed to transmit modulating frequencies up to 5 kHz. If the AM station is transmitting on a frequency of 980 kHz, what is the total bandwidth occupied by the AM station?

asked Jul 12, 2014 by balaji.thirumalai

1 answer

If the maximum peak-to-peak voltage of an AM wave is 16mV and the minimum peak-to peak voltage is 4mV, calculate the modulation factor.

asked Jul 12, 2014 by balaji.thirumalai

1 answer

A transmission tower at a particular place has a height of 160m. (A) What is its coverage range? (B) By how much should the height be increased to double its coverage range? Given that radius of earth = 6400 km.

asked Jul 12, 2014 by balaji.thirumalai

1 answer

A message signal of frequency 12 kHz and peak voltage of 20 volts is used to modulate a carrier of frequency 12 MHz and peak voltage of 30 volts. Determine (a) modulation index, (b) the side bands produced and (c) bandwidth of modulated wave.

asked Jul 12, 2014 by balaji.thirumalai

1 answer

A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. Determine (a) modulation index, (b) the side bands produced.

asked Jul 12, 2014 by balaji.thirumalai

1 answer