Radio Receivers Show which of the following statements about the amplitude limiter is untrue: Leak-type bias must be used The circuit is always biased in class C, by virtue of the leak-type bias. When the input increases past the threshold of the limiting, the gain decreases to keep the output constant. The output must be tuned Leak-type bias must be used The circuit is always biased in class C, by virtue of the leak-type bias. When the input increases past the threshold of the limiting, the gain decreases to keep the output constant. The output must be tuned ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The image frequency of a superheterodyne receiver Is created within the receiver itself Is due to insufficient adjacent channel rejection Is independent of the frequency to which the receiver is tuned Is not rejected be the IF tuned circuits Is created within the receiver itself Is due to insufficient adjacent channel rejection Is independent of the frequency to which the receiver is tuned Is not rejected be the IF tuned circuits ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers In a broadcast superheterodyne receiver, the Local oscillator operates below the signal frequency Local oscillator frequency is normally double the IF Mixer input must be tuned to the signal frequency RF amplifier normally works at 455 kHz above the carrier frequency Local oscillator operates below the signal frequency Local oscillator frequency is normally double the IF Mixer input must be tuned to the signal frequency RF amplifier normally works at 455 kHz above the carrier frequency ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of Improving the effectiveness of the AGC Improving the selectivity of the receiver Reducing the effect of noise at low modulation depths Reducing the effect of negative-peak clipping Improving the effectiveness of the AGC Improving the selectivity of the receiver Reducing the effect of noise at low modulation depths Reducing the effect of negative-peak clipping ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers To prevent overloading of the IF amplifier in a receiver, one should use Variable selectivity Variable sensitivity Squelch Double conversion Variable selectivity Variable sensitivity Squelch Double conversion ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers A low ratio of the ac to the dc load impedance of a diode detector results in Poor AGC operation Negative-peak clipping Diagonal clipping Poor AF response Poor AGC operation Negative-peak clipping Diagonal clipping Poor AF response ANSWER DOWNLOAD EXAMIANS APP
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