Radio Receivers
The controlled oscillator synthesizer is sometimes preferred over the direct one because

Its frequency stability is better
It is a simpler piece of equipment
It does not require crystal oscillator
It is relatively free of spurious frequency

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Radio Receivers
In a radio receiver with simple AGC

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

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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

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Radio Receivers
In a broadcast superheterodyne receiver, the

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

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