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

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

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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 ratio detector

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

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