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

Product modulator
Phase discriminator
BFO
Balance modulator

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP

Radio Receivers
In a broadcast superheterodyne receiver, the

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

ANSWER DOWNLOAD EXAMIANS APP

Radio Receivers
In a ratio detector

the linearity is worse than in phase discriminator
the output is twice that obtainable from a similar phase discriminator
the circuit is the same as in a discriminator, except that the diodes are reversed
stabilization against signal strength variations is provided

ANSWER DOWNLOAD EXAMIANS APP

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
Improving the selectivity of the receiver
Improving the effectiveness of the AGC
Reducing the effect of negative-peak clipping

ANSWER DOWNLOAD EXAMIANS APP