RADIO RECEIVERS QUIZ

Three-point tracking is achieved with

Double conversion

Double spotting

Variable selectivity

The padder capacitor

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

The output must be tuned

Leak-type bias must be used

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

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

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One of the following cannot be used to demodulate SSB:

Bipolar transistor balanced modulator

Product detector

Complete phase-shift generator

Diode Balance modulator

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

Reduce the spurious frequency problem

Reduce the number of crystals required

Reduce the number of decades

Increase the frequency stability of the synthesizer

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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 selectivity of the receiver

Reducing the effect of negative-peak clipping

Improving the effectiveness of the AGC

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The typical squelch circuit cuts off

RF interference when the signal is weak

An IF amplifier when the AGC is minimum

an audio amplifier when the carrier is absent

An IF amplifier when the AGC is maximum

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In a radio receiver with simple AGC

The faster the AGC time constant the more accurate the output

The audio stage gain is normally controlled by the AGC

The highest AGC voltage is produced

An increase in signal strength produces more AGC

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When a receiver has good blocking performance, this means that

Its detector suffers from burnout

It is unaffected by AGC derived from nearby transmissions

It does not suffer from double-spotting

Its image frequency rejection is poor

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If the intermediate frequency is very high (indicate false statement)

The selectivity will be poor

The local oscillator need not be extremely stable

Image frequency rejection is very good

Tracking will be improved

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

It is a simpler piece of equipment

It does not require crystal oscillator

It is relatively free of spurious frequency

Its frequency stability is better

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