Radio Receivers
Indicate which of the following circuits could not demodulate SSB:

Balance modulator
BFO
Product modulator
Phase discriminator

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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
The receiver cannot use a phase comparator for AFC
Production of AGC is a rather complicated process

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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 frequency is normally double the IF
Local oscillator operates below the signal frequency
Mixer input must be tuned to the signal frequency

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Radio Receivers
In a radio receiver with simple AGC

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

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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

Improving the effectiveness of the AGC
Reducing the effect of noise at low modulation depths
Improving the selectivity of the receiver
Reducing the effect of negative-peak clipping

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