Radio Receivers The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to Reduce the number of decades Reduce the number of crystals required Reduce the spurious frequency problem Increase the frequency stability of the synthesizer Reduce the number of decades Reduce the number of crystals required Reduce the spurious frequency problem Increase the frequency stability of the synthesizer ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The typical squelch circuit cuts off RF interference when the signal is weak an audio amplifier when the carrier is absent An IF amplifier when the AGC is minimum An IF amplifier when the AGC is maximum RF interference when the signal is weak an audio amplifier when the carrier is absent An IF amplifier when the AGC is minimum An IF amplifier when the AGC is maximum ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency Because otherwise an intermediate frequency could not be produced To allow adequate frequency coverage without switching To help the image frequency rejection To permit easier tracking Because otherwise an intermediate frequency could not be produced To allow adequate frequency coverage without switching To help the image frequency rejection To permit easier tracking 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 Improve the rejection of the image frequency Increase the tuning range of the receiver Provide improved tracking Permit better adjacent-channel rejection Improve the rejection of the image frequency Increase the tuning range of the receiver Provide improved tracking 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 Gain variation over the frequency coverage range Insufficient gain and sensitivity Instability Inadequate selectivity at high frequencies Gain variation over the frequency coverage range Insufficient gain and sensitivity 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 Reducing the effect of negative-peak clipping Improving the effectiveness of the AGC Reducing the effect of noise at low modulation depths Improving the selectivity of the receiver Reducing the effect of negative-peak clipping Improving the effectiveness of the AGC Reducing the effect of noise at low modulation depths Improving the selectivity of the receiver ANSWER DOWNLOAD EXAMIANS APP
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