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Question
Distinguish between broadcast mode and point-to-point mode of communication and give one example for each.
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Solution
The difference between point-to-point mode of communication and broadcast mode of communication :
| Point-to-point mode of communication | Broadcast mode of communication |
| Point to point communication mode is the communication over a link between a single transmitter and a receiver. | In broadcast mode large number of receivers are linked to a single transmitter. |
| Only one receiver is involved here | A large number of receivers may be involved. |
| Telephone is an example of such a system. | Radio is example of such system. |
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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?
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- 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).

An audio signal is modulated by a carrier wave of 20 MHz such that the bandwidth required for modulation is 3 kHz. Could this wave be demodulated by a diode detector which has the values of R and C as
- R = 1 kΩ, C = 0.01 µF.
- R = 10 kΩ, C = 0.01 µF.
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