A carrier wave of frequency 100 MHz is frequency-modulated by a sinusoidal wave of amplitude 20 volts
Question:
A carrier wave of frequency 100 MHz is frequency-modulated by a sinusoidal wave of amplitude 20 volts and frequency 100 kHz. The frequency sensitivity of the modulator is 2.3 kHz per volt.
(a) Determine the approximate bandwidth of the FM signal, using Carson’s rule.
(b) Determine the bandwidth by transmitting only those side frequencies whose amplitudes exceed 1 percent of the unmodulated carrier amplitude. Use the universal curve of Figure for this calculation.
(c) Repeat your calculations, assuming that the amplitude of the modulating signal is doubled.
(d) Repeat your calculations, assuming that the modulation frequency is doubled.
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a The frequency deviation is Af KA 25 x 103 x 20 5 x 105 Hz The cor...View the full answer
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