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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
Local oscillator frequency is normally double the IF
Mixer input must be tuned to the signal frequency
RF amplifier normally works at 455 kHz above the carrier frequency
Local oscillator operates below the signal frequency
Local oscillator frequency is normally double the IF
Mixer input must be tuned to the signal frequency
Answer
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Related Question
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 spurious frequency problem
Increase the frequency stability of the synthesizer
Reduce the number of crystals required
Reduce the number of decades
Reduce the spurious frequency problem
Increase the frequency stability of the synthesizer
Reduce the number of crystals required
Reduce the number of decades
Answer
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Radio Receivers
In a radio receiver with simple AGC
The highest AGC voltage is produced
An increase in signal strength produces more AGC
The faster the AGC time constant the more accurate the output
The audio stage gain is normally controlled by the AGC
The highest AGC voltage is produced
An increase in signal strength produces more AGC
The faster the AGC time constant the more accurate the output
The audio stage gain is normally controlled by the AGC
Answer
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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
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Radio Receivers
To prevent overloading of the IF amplifier in a receiver, one should use
Variable selectivity
Double conversion
Squelch
Variable sensitivity
Variable selectivity
Double conversion
Squelch
Variable sensitivity
Answer
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Radio Receivers
Three-point tracking is achieved with
Double conversion
Double spotting
The padder capacitor
Variable selectivity
Double conversion
Double spotting
The padder capacitor
Variable selectivity
Answer
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