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

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Radio Receivers
Indicate the false statement in connection with communications receivers.

Variable sensitivity is used to eliminate selective fading
The noise limiter cuts off the receiver’s output during a noise pulse.
Double conversion is used to improve image rejection
A product demodulator could be used for the reception of Morse code.

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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

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

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