ECONOMICS OF POWER GENERATION QUIZ

To prevent overloading of the IF amplifier in a receiver, one should use

Variable sensitivity

Squelch

Variable selectivity

Double conversion

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In a broadcast superheterodyne receiver, the

RF amplifier normally works at 455 kHz above the carrier frequency

Mixer input must be tuned to the signal frequency

Local oscillator operates below the signal frequency

Local oscillator frequency is normally double the IF

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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 effectiveness of the AGC

Improving the selectivity of the receiver

Reducing the effect of negative-peak clipping

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

Adjacent-channel rejection is more difficult

The receiver cannot use a phase comparator for AFC

The transmission is not compatible with A3E

Production of AGC is a rather complicated process

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When a receiver has good blocking performance, this means that

It does not suffer from double-spotting

Its image frequency rejection is poor

It is unaffected by AGC derived from nearby transmissions

Its detector suffers from burnout

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Show which of the following statements about the amplitude limiter is untrue:

Leak-type bias must be used

The circuit is always biased in class C, by virtue of the leak-type bias.

The output must be tuned

When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.

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

It does not require crystal oscillator

Its frequency stability is better

It is a simpler piece of equipment

It is relatively free of spurious frequency

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A receiver has poor IF selectivity. It will therefore also have poor

Diversion reception

Sensitivity

Double-spotting

Blocking

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A low ratio of the ac to the dc load impedance of a diode detector results in

Negative-peak clipping

Poor AGC operation

Poor AF response

Diagonal clipping

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Indicate which of the following circuits could not demodulate SSB:

Product modulator

BFO

Phase discriminator

Balance modulator

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