Radio Receivers
The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to

Reduce the number of decades
Reduce the spurious frequency problem
Increase the frequency stability of the synthesizer
Reduce the number of crystals required

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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
Production of AGC is a rather complicated process
The receiver cannot use a phase comparator for AFC
The transmission is not compatible with A3E

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

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