Radio Receivers One of the main functions of the RF amplifier in a superheterodyne receiver is to Improve the rejection of the image frequency Provide improved tracking Permit better adjacent-channel rejection Increase the tuning range of the receiver Improve the rejection of the image frequency Provide improved tracking Permit better adjacent-channel rejection Increase the tuning range of the receiver ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers A low ratio of the ac to the dc load impedance of a diode detector results in Negative-peak clipping Poor AGC operation Diagonal clipping Poor AF response Negative-peak clipping Poor AGC operation Diagonal clipping Poor AF response ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The typical squelch circuit cuts off an audio amplifier when the carrier is absent RF interference when the signal is weak An IF amplifier when the AGC is minimum An IF amplifier when the AGC is maximum an audio amplifier when the carrier is absent RF interference when the signal is weak An IF amplifier when the AGC is minimum An IF amplifier when the AGC is maximum ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers In a radio receiver with simple 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 The highest AGC voltage is produced The audio stage gain is normally controlled by the AGC ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers If the intermediate frequency is very high (indicate false statement) Image frequency rejection is very good Tracking will be improved The local oscillator need not be extremely stable The selectivity will be poor Image frequency rejection is very good Tracking will be improved The local oscillator need not be extremely stable The selectivity will be poor ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers Indicate the false statement in connection with communications receivers. A product demodulator could be used for the reception of Morse code. The noise limiter cuts off the receiver’s output during a noise pulse. Variable sensitivity is used to eliminate selective fading Double conversion is used to improve image rejection A product demodulator could be used for the reception of Morse code. The noise limiter cuts off the receiver’s output during a noise pulse. Variable sensitivity is used to eliminate selective fading Double conversion is used to improve image rejection ANSWER DOWNLOAD EXAMIANS APP
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