ECE :: Communication Systems
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Consider the following types of distortions in diode detectors
- Distortion is caused due to the reason that dc and ac load impedances are unequal
- Distortion is caused because ac load impedance has a reactive component at high audio frequencies
- Audio frequency diode current is less than dc current
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Satellites used for international communication are called
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In a phase discriminator fc, is the IF to which primary circuit is tuned. Consider the following statements: The primary and secondary voltages are
- exactly 90° out of phase when input frequency is fc
- more than 90° out of phase when input frequency is higher than fc
- less than 90° out of phase when input frequency is lower than fc
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Electronic tubes used for transmitter differ from their counterparts in the receivers in respect that
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A plot of modulation index vs carrier amplitude yields a
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In a certain '12 channel TDM' system it is found that channel no. 3 and channel no. 8 are connected to the same input signal. This technique
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Which wave is also called surface wave?
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ADM stands for
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The atmospheric absorption of radio waves depends on
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Efficiency of general AM signal with em = E1 cos ω1t + E2 cos ω2 tj ec = Ec cos ωct; E1 cos ω1t with modulation index m2 is __________ .
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