Radio Receivers The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to Increase the frequency stability of the synthesizer Reduce the number of crystals required Reduce the spurious frequency problem Reduce the number of decades Increase the frequency stability of the synthesizer Reduce the number of crystals required Reduce the spurious frequency problem Reduce the number of decades ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers In a radio receiver with simple AGC The highest AGC voltage is produced An increase in signal strength produces more AGC The audio stage gain is normally controlled by the AGC The faster the AGC time constant the more accurate the output The highest AGC voltage is produced An increase in signal strength produces more AGC The audio stage gain is normally controlled by the AGC The faster the AGC time constant the more accurate the output ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers To prevent overloading of the IF amplifier in a receiver, one should use Squelch Variable sensitivity Double conversion Variable selectivity Squelch Variable sensitivity Double conversion Variable selectivity ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers Show which of the following statements about the amplitude limiter is untrue: 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 output must be tuned The circuit is always biased in class C, by virtue of the leak-type bias. 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 output must be tuned The circuit is always biased in class C, by virtue of the leak-type bias. ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from Instability Inadequate selectivity at high frequencies Insufficient gain and sensitivity Gain variation over the frequency coverage range Instability Inadequate selectivity at high frequencies Insufficient gain and sensitivity Gain variation over the frequency coverage range 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 Provide improved tracking Increase the tuning range of the receiver Improve the rejection of the image frequency Permit better adjacent-channel rejection Provide improved tracking Increase the tuning range of the receiver Improve the rejection of the image frequency ANSWER DOWNLOAD EXAMIANS APP
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