Radio Receivers Show which of the following statements about the amplitude limiter is untrue: The circuit is always biased in class C, by virtue of the leak-type bias. The output must be tuned Leak-type bias must be used When the input increases past the threshold of the limiting, the gain decreases to keep the output constant. The circuit is always biased in class C, by virtue of the leak-type bias. The output must be tuned Leak-type bias must be used When the input increases past the threshold of the limiting, the gain decreases to keep the output constant. ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers Indicate the false statement in connection with communications receivers. Double conversion is used to improve image rejection The noise limiter cuts off the receiver’s output during a noise pulse. A product demodulator could be used for the reception of Morse code. Variable sensitivity is used to eliminate selective fading Double conversion is used to improve image rejection The noise limiter cuts off the receiver’s output during a noise pulse. A product demodulator could be used for the reception of Morse code. Variable sensitivity is used to eliminate selective fading ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers In a broadcast superheterodyne receiver, the 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 Local oscillator operates below the signal frequency Local oscillator frequency is normally double the IF Mixer input must be tuned to the signal frequency ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from Insufficient gain and sensitivity Inadequate selectivity at high frequencies Gain variation over the frequency coverage range Instability Insufficient gain and sensitivity Inadequate selectivity at high frequencies Gain variation over the frequency coverage range Instability ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers One of the main functions of the RF amplifier in a superheterodyne receiver is to Permit better adjacent-channel rejection Increase the tuning range of the receiver Provide improved tracking Improve the rejection of the image frequency Permit better adjacent-channel rejection Increase the tuning range of the receiver Provide improved tracking Improve the rejection of the image frequency ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The image frequency of a superheterodyne receiver Is not rejected be the IF tuned circuits Is independent of the frequency to which the receiver is tuned Is created within the receiver itself Is due to insufficient adjacent channel rejection Is not rejected be the IF tuned circuits Is independent of the frequency to which the receiver is tuned Is created within the receiver itself Is due to insufficient adjacent channel rejection ANSWER DOWNLOAD EXAMIANS APP
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