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 number of decades Reduce the spurious frequency problem Increase the frequency stability of the synthesizer Reduce the number of crystals required Reduce the number of decades Reduce the spurious frequency problem ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The typical squelch circuit cuts off An IF amplifier when the AGC is maximum An IF amplifier when the AGC is minimum an audio amplifier when the carrier is absent RF interference when the signal is weak An IF amplifier when the AGC is maximum An IF amplifier when the AGC is minimum an audio amplifier when the carrier is absent RF interference when the signal is weak ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers In a radio receiver with simple AGC The highest AGC voltage is produced The audio stage gain is normally controlled by the AGC An increase in signal strength produces more AGC The faster the AGC time constant the more accurate the output The highest AGC voltage is produced The audio stage gain is normally controlled by the AGC An increase in signal strength produces more 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 Double conversion Squelch Variable selectivity Variable sensitivity Double conversion Squelch Variable selectivity Variable sensitivity ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers When a receiver has good blocking performance, this means that It does not suffer from double-spotting Its detector suffers from burnout It is unaffected by AGC derived from nearby transmissions Its image frequency rejection is poor It does not suffer from double-spotting Its detector suffers from burnout It is unaffected by AGC derived from nearby transmissions Its image frequency rejection is poor 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
EXAMIANS