RADIO RECEIVERS QUIZ

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

Increase the frequency stability of the synthesizer

Reduce the number of decades

Reduce the spurious frequency problem

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The typical squelch circuit cuts off

An IF amplifier when the AGC is maximum

RF interference when the signal is weak

an audio amplifier when the carrier is absent

An IF amplifier when the AGC is minimum

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In a broadcast superheterodyne receiver, the

Local oscillator operates below the signal frequency

Local oscillator frequency is normally double the IF

RF amplifier normally works at 455 kHz above the carrier frequency

Mixer input must be tuned to the signal frequency

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Indicate which of the following circuits could not demodulate SSB:

Balance modulator

BFO

Phase discriminator

Product modulator

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

Its frequency stability is better

It is relatively free of spurious frequency

It is a simpler piece of equipment

It does not require crystal oscillator

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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 noise at low modulation depths

Reducing the effect of negative-peak clipping

Improving the effectiveness of the AGC

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

The transmission is not compatible with A3E

Adjacent-channel rejection is more difficult

Production of AGC is a rather complicated process

The receiver cannot use a phase comparator for AFC

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

Image frequency rejection is very good

The local oscillator need not be extremely stable

Tracking will be improved

The selectivity will be poor

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The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

To permit easier tracking

To allow adequate frequency coverage without switching

To help the image frequency rejection

Because otherwise an intermediate frequency could not be produced

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An AM receiver uses a diode detector for demodulation. This enables it satisfactorily to receive

Single-sideband, suppressed-carrier

ISB

Single-sideband, full-carrier

Single-sideband, reduced-carrier

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