Radio Receivers
The image frequency of a superheterodyne receiver

Is due to insufficient adjacent channel rejection
Is independent of the frequency to which the receiver is tuned
Is not rejected be the IF tuned circuits
Is created within the receiver itself

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Radio Receivers
In a radio receiver with simple AGC

The audio stage gain is normally controlled by the AGC
An increase in signal strength produces more AGC
The highest AGC voltage is produced
The faster the AGC time constant the more accurate the output

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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

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Radio Receivers
Show which of the following statements about the amplitude limiter is untrue:

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

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Radio Receivers
Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that

The transmission is not compatible with A3E
The receiver cannot use a phase comparator for AFC
Production of AGC is a rather complicated process
Adjacent-channel rejection is more difficult

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