Radio Receivers When a receiver has good blocking performance, this means that Its image frequency rejection is poor Its detector suffers from burnout It does not suffer from double-spotting It is unaffected by AGC derived from nearby transmissions Its image frequency rejection is poor Its detector suffers from burnout It does not suffer from double-spotting It is unaffected by AGC derived from nearby transmissions 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 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 spurious frequency problem Reduce the number of crystals required Reduce the number of decades Increase the frequency stability of the synthesizer Reduce the spurious frequency problem Reduce the number of crystals required Reduce the number of decades ANSWER DOWNLOAD EXAMIANS APP
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. 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 ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers One of the following cannot be used to demodulate SSB: Complete phase-shift generator Bipolar transistor balanced modulator Product detector Diode Balance modulator Complete phase-shift generator Bipolar transistor balanced modulator Product detector Diode Balance modulator ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers Indicate the false statement in connection with communications receivers. The noise limiter cuts off the receiver’s output during a noise pulse. Double conversion is used to improve image rejection A product demodulator could be used for the reception of Morse code. Variable sensitivity is used to eliminate selective fading The noise limiter cuts off the receiver’s output during a noise pulse. Double conversion is used to improve image rejection A product demodulator could be used for the reception of Morse code. Variable sensitivity is used to eliminate selective fading ANSWER DOWNLOAD EXAMIANS APP
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