ECE :: Communication Systems
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In an AM system, doubling of modulation index doubles the antenna current. The system is
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A frequency multiplier stage should operate as
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UHF range is
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A carrier signal at frequency 100 MHz is frequency modulated with modulation index 2 by a signal at 2 kHz. At what frequencies are the sidebands produced?
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Which is not purpose of modulation?
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An FM transmitter has maximum frequency deviation of 75 kHz and reproduces audio signals up to 15 kHz. Minimum channel width required is __________ kHz.
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A 360 W carrier is simultaneously modulated by two audio wave with modulation percentage of 55 and 65 respectively. Total sideband power radiated will be
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In a radio detector
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ISDN stands for
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Under identical conditions, for a single modulating frequency, FM and PM are indistinguishable. Now if the modulating frequency is reduced, then
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A.
phase modulation index as well as frequency modulation index decrease
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B.
phase modulation index as well as frequency modulation index increase
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C.
phase modulation index will remain constant whereas frequency modulation index will increase
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D.
phase modulation index will decrease whereas frequency modulation index will remain constant
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