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 faster the AGC time constant the more accurate the output
The highest AGC voltage is produced

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Radio Receivers
In a broadcast superheterodyne receiver, the

Local oscillator operates below the signal frequency
RF amplifier normally works at 455 kHz above the carrier frequency
Mixer input must be tuned to the signal frequency
Local oscillator frequency is normally double the IF

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

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

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Radio Receivers
Indicate the false statement in connection with communications receivers.

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.

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