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Radio Receivers
To prevent overloading of the IF amplifier in a receiver, one should use
Variable sensitivity
Double conversion
Variable selectivity
Squelch
Variable sensitivity
Double conversion
Variable selectivity
Squelch
Answer
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Related Question
Radio Receivers
Indicate the false statement in connection with communications receivers.
A product demodulator could be used for the reception of Morse code.
Double conversion is used to improve image rejection
The noise limiter cuts off the receiver’s output during a noise pulse.
Variable sensitivity is used to eliminate selective fading
A product demodulator could be used for the reception of Morse code.
Double conversion is used to improve image rejection
The noise limiter cuts off the receiver’s output during a noise pulse.
Variable sensitivity is used to eliminate selective fading
Answer
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Radio Receivers
In a broadcast superheterodyne receiver, the
RF amplifier normally works at 455 kHz above the carrier frequency
Local oscillator operates below the signal frequency
Mixer input must be tuned to the signal frequency
Local oscillator frequency is normally double the IF
RF amplifier normally works at 455 kHz above the carrier frequency
Local oscillator operates below the signal frequency
Mixer input must be tuned to the signal frequency
Local oscillator frequency is normally double the IF
Answer
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Radio Receivers
If the intermediate frequency is very high (indicate false statement)
Image frequency rejection is very good
The selectivity will be poor
The local oscillator need not be extremely stable
Tracking will be improved
Image frequency rejection is very good
The selectivity will be poor
The local oscillator need not be extremely stable
Tracking will be improved
Answer
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Radio Receivers
Show which of the following statements about the amplitude limiter is untrue:
When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.
The circuit is always biased in class C, by virtue of the leak-type bias.
Leak-type bias must be used
The output must be tuned
When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.
The circuit is always biased in class C, by virtue of the leak-type bias.
Leak-type bias must be used
The output must be tuned
Answer
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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
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