Radio Receivers If the intermediate frequency is very high (indicate false statement) Image frequency rejection is very good The local oscillator need not be extremely stable The selectivity will be poor Tracking will be improved Image frequency rejection is very good The local oscillator need not be extremely stable The selectivity will be poor Tracking will be improved ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers Indicate the false statement in connection with communications receivers. Double conversion is used to improve image rejection The noise limiter cuts off the receiver’s output during a noise pulse. A product demodulator could be used for the reception of Morse code. Variable sensitivity is used to eliminate selective fading Double conversion is used to improve image rejection The noise limiter cuts off the receiver’s output during a noise pulse. A product demodulator could be used for the reception of Morse code. Variable sensitivity is used to eliminate selective fading ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers To prevent overloading of the IF amplifier in a receiver, one should use Squelch Variable sensitivity Variable selectivity Double conversion Squelch Variable sensitivity Variable selectivity Double conversion ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers In a ratio detector stabilization against signal strength variations is provided the output is twice that obtainable from a similar phase discriminator the linearity is worse than in phase discriminator the circuit is the same as in a discriminator, except that the diodes are reversed stabilization against signal strength variations is provided the output is twice that obtainable from a similar phase discriminator the linearity is worse than in phase discriminator the circuit is the same as in a discriminator, except that the diodes are reversed ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency To permit easier tracking To help the image frequency rejection To allow adequate frequency coverage without switching Because otherwise an intermediate frequency could not be produced To permit easier tracking To help the image frequency rejection To allow adequate frequency coverage without switching Because otherwise an intermediate frequency could not be produced 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. When the input increases past the threshold of the limiting, the gain decreases to keep the output constant. Leak-type bias must be used The output must be tuned The circuit is always biased in class C, by virtue of the leak-type bias. When the input increases past the threshold of the limiting, the gain decreases to keep the output constant. Leak-type bias must be used The output must be tuned ANSWER DOWNLOAD EXAMIANS APP
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