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The frequency of a FM transmitter withou...

The frequency of a FM transmitter without signal input is called

A

lower side band frequency

B

upper side band frequency

C

resting frequency

D

none of the above

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The correct Answer is:
C
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The carrier frequency of a transmitter is provided by a tank circuit of a coil of inductance 49 muH and a capacitance of 2.5 nF It is modulated by an audio signal of 12 kHz The frequency range occupied by the side bands is :

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The efficient transmission of signals is achieved by superimposing electrical audio signals on a high frequency carrier wave (the process is known as modulation). When the amplitude of high frequency carrier wave is changed in accordance with the intensity of modulating signal, it is called amplitude modulation. The extent to which the amplitude of carrier wave is changed by the signal is described by modulation factor. It is given as m="Amplitude change of carrier wave"/"Amplitude of unmodulated carrier wave" Let a carrier wave is represented by V_c=V_c cos omega_ct Let the modulation factor be m, the maximum change in amplitude of carrier wave is mV_c So, modulating signal can be represented as v_m=mV_c cosomega_mt So, the amplitude of modulated wave is =V_c+mV_c cosomega_m t Using this value, the instantaneous voltage of modulated wave is E=V_c cos omega_c t+ (mV_c)/2 cos (omega_c+omega_m)t + (mV_c)/2 cos (omega_c-omega_m ) t The above wave contains three frequencies namely, f_c, f_c+f_m and f_c-f_m . The frequencies f_c+f_m and f_c-f_m are called side band frequencies , USB and LSB respectively. The fraction of total power carried by side band frequencies is

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AAKASH SERIES-COMMUNICATION SYSTEM -LECTURE SHEET (LEVEL - I) (MAIN) (EXERCISE - III) (Straight Objective & More than one Correct Answer Type Questions)
  1. Which of following four alternatives is not correct? We need modulatio...

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  2. In frequency modulation

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  3. The frequency of a FM transmitter without signal input is called

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  4. The AM wave of equivalent to the summation of

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  5. The AM wave contans three frequencies viz:

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  6. In AM wave the amplitude of each side hand frequency is

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  7. In AM wave, carrier power is given by-

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  8. In AM wave total power of side bands is given by :

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  9. Fraction of total power carried by side bands is given by-

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  10. Modulation factor determines-

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  11. if the maximum and minimum voltage of AM wave are V(max) and V(min), r...

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  12. When m=1 ,power carried by side bands is:

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  13. Which of the following is/are the limitations of amplitude modulation?

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  14. Degree of modulation-

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  15. A signal wave of frequency 12KHz is modulated with a carrier wave of f...

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  16. The antenna current of an AM transmitter is 8A when only the carrier i...

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  17. A 1kW signal is transmitted using a communication channel which provid...

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  18. A speech signal of 3 KHz is used to modulate a carrier signal of frequ...

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  19. A message signal of frequency omega(m) is superposed on a carrier wave...

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  20. 1-V characteristics of four devices are shown in figure. Identif...

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