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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
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Related Question
Radio Receivers
A low ratio of the ac to the dc load impedance of a diode detector results in
Negative-peak clipping
Diagonal clipping
Poor AGC operation
Poor AF response
Negative-peak clipping
Diagonal clipping
Poor AGC operation
Poor AF response
Answer
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Radio Receivers
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of
Reducing the effect of noise at low modulation depths
Reducing the effect of negative-peak clipping
Improving the selectivity of the receiver
Improving the effectiveness of the AGC
Reducing the effect of noise at low modulation depths
Reducing the effect of negative-peak clipping
Improving the selectivity of the receiver
Improving the effectiveness of the AGC
Answer
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Radio Receivers
Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that
The receiver cannot use a phase comparator for AFC
Production of AGC is a rather complicated process
The transmission is not compatible with A3E
Adjacent-channel rejection is more difficult
The receiver cannot use a phase comparator for AFC
Production of AGC is a rather complicated process
The transmission is not compatible with A3E
Adjacent-channel rejection is more difficult
Answer
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Radio Receivers
The image frequency of a superheterodyne receiver
Is independent of the frequency to which the receiver is tuned
Is created within the receiver itself
Is due to insufficient adjacent channel rejection
Is not rejected be the IF tuned circuits
Is independent of the frequency to which the receiver is tuned
Is created within the receiver itself
Is due to insufficient adjacent channel rejection
Is not rejected be the IF tuned circuits
Answer
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Radio Receivers
Show which of the following statements about the amplitude limiter is untrue:
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
The circuit is always biased in class C, by virtue of the leak-type bias.
Answer
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