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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
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Related Question
Radio Receivers
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of
Improving the selectivity of the receiver
Reducing the effect of noise at low modulation depths
Reducing the effect of negative-peak clipping
Improving the effectiveness of the AGC
Improving the selectivity of the receiver
Reducing the effect of noise at low modulation depths
Reducing the effect of negative-peak clipping
Improving the effectiveness of the AGC
Answer
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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
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Radio Receivers
An AM receiver uses a diode detector for demodulation. This enables it satisfactorily to receive
Single-sideband, full-carrier
Single-sideband, reduced-carrier
ISB
Single-sideband, suppressed-carrier
Single-sideband, full-carrier
Single-sideband, reduced-carrier
ISB
Single-sideband, suppressed-carrier
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
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
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
Increase the frequency stability of the synthesizer
Answer
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