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प्रश्न
Write the functions of the transducer and repeaters.
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उत्तर
The function of a transducer is to convert one form of energy into another form. A microphone at the transmitting station is one of the examples of a transducer.
The function of a repeater is to regenerate the signal which can be transmitted forward. A repeater is a combination of a receiver, amplifier, and a transmitter. A repeater receives the signal, amplifies it and then retransmits it forward.
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संबंधित प्रश्न
Write the functions of the following in communication systems:
Modulator
Write the functions of the following in communication systems:
Receiver
Write the functions of the following in communication systems:
Demodulator
Explain the term demodulation used in a communication system.
Distinguish between point to point and broadcast modes of communication. Give an example of each.
Write the function of receiver in communication system.
What is the function of a bandpass filter used in a modulator for obtaining AM signal?
A 1 KW signal is transmitted using a communication channel which provides attenuation at the rate of – 2dB per km. If the communication channel has a total length of 5 km, the power of the signal received is `["gain in dB" = 10 log ("P"_0/"P"_"i")]`
Audio sine waves of 3 kHz frequency are used to amplitude modulate a carrier signal of 1.5 MHz. Which of the following statements are true?
- The sideband frequencies are 1506 kHz and 1494 kHz.
- The bandwidth required for amplitude modulation is 6 kHz.
- The bandwidth required for amplitude modulation is 3 MHz.
- The side band frequencies are 1503 kHz and 1497 kHz.
Figure shows a communication system. What is the output power when input signal is of 1.01 mW? (gain in dB = 10 log10 (Po/Pi).
