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A separate high freq. wave (i.e. carrier...

A separate high freq. wave (i.e. carrier wave) is needed in modulation why ?

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This is because we cannot any of the characterostics (amplitude, frequency or phase) of the audio signal as this would change the message to be communicated. So keeping the audio signal same, the amplitude of freq. or phase of the high freq. carrier wave is modified in accordance with the modulating (i.e. audio signal) signal.
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ALLEN -WAVES AND OSCILLATIONS-Part-3(Example)
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  2. A sinusoidal voltage of amplitude 25 volts and frequency 50 Hz is appl...

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  4. A fullwave rectifier supplies a load of 1 k Omega. The a.c voltage app...

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  5. A fullwave P.N diode rectifier used load resistor of 1500 Omega. No fi...

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  6. A zener diode of voltage V(Z)(=6 volt) is used to maintain a constant ...

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  7. A Zener diode is specified having a breakdown voltage of 9.1 V with a ...

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  8. In a transistor, the value of beta is 50. Calculate the value of alpha

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  9. Calculate the collector and emitter current for which I(b) = 20 mA, be...

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  10. For a common emitter amplifier, current gain = 50. If the emitter curr...

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  11. Transistor with beta = 75 is connected to common-base configuration. W...

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  12. The base current is 100 muA and collector current is 3 mA (a) Calcul...

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  13. In npn transistor circuit, the collector current us 10 mA. If 95 % of ...

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  14. In an NPN transistor 10^(10) electrons enter the emitter in 10^(-6)s a...

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  15. TV transmission tower at Kota has a height of 80 m. Radius of earth is...

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  16. A ground reciver is receiving a signal at (a) 5 MHz, and (b) 100 MHz, ...

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  17. A separate high freq. wave (i.e. carrier wave) is needed in modulation...

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  18. A message signal of frequency 10kHz and peak voltage of 10"volts" is u...

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  19. The modulation index of an FM carrier having a carrier swing of 200kHz...

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  20. A 100 MHz xarrier wave frequency is modulated by 10 kHz sinusoidal mod...

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