O1: A given FM transmitter is modulated with sinusoid input (in volts),f(t) = %3D 10cos200nt , and the modulation index is 5. the modulated carrier power is 10 watt across 50 2 resistive load, Determine: (a)The modulation constantkf. (b) The peak amplitude of the first-order lower sideband and its phase relative to the unmodulated carrier. (c) The ratio of the average power in the sum of the third and fourth order sidebands to the power in all remaining sidebands excluding carrier.

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O11: A given FM transmitter is modulated with sinusoid input (in volts),f(t) =
10cos200nt , and the modulation index is 5. the modulated carrier power is 10
watt across 50 2 resistive load, Determine:
%3D
(a)The modulation constantkf.
(b) The peak amplitude of the first-order lower sideband and its phase relative
to the unmodulated carrier.
(c) The ratio of the average power in the sum of the third and fourth order
sidebands to the power in all remaining sidebands excluding carrier.
(d) The bandwidth reduction factor if the input sinusoid peak amplitude is
reduced to 2 v (use Carson's rule).
Ans: (a) 50 Hz/ v, (b) 10.4 0°, (c) 0.582, (d)
Transcribed Image Text:O11: A given FM transmitter is modulated with sinusoid input (in volts),f(t) = 10cos200nt , and the modulation index is 5. the modulated carrier power is 10 watt across 50 2 resistive load, Determine: %3D (a)The modulation constantkf. (b) The peak amplitude of the first-order lower sideband and its phase relative to the unmodulated carrier. (c) The ratio of the average power in the sum of the third and fourth order sidebands to the power in all remaining sidebands excluding carrier. (d) The bandwidth reduction factor if the input sinusoid peak amplitude is reduced to 2 v (use Carson's rule). Ans: (a) 50 Hz/ v, (b) 10.4 0°, (c) 0.582, (d)
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