RADIO RECEIVERS QUIZ

One of the main functions of the RF amplifier in a superheterodyne receiver is to

Improve the rejection of the image frequency

Increase the tuning range of the receiver

Permit better adjacent-channel rejection

Provide improved tracking

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When a receiver has good blocking performance, this means that

It is unaffected by AGC derived from nearby transmissions

It does not suffer from double-spotting

Its image frequency rejection is poor

Its detector suffers from burnout

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Indicate which of the following circuits could not demodulate SSB:

BFO

Phase discriminator

Product modulator

Balance modulator

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

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

Leak-type bias must be used

The output must be tuned

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

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A superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is

750 kHz

2100 kHz

1650 kHz

900 kHz

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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

Production of AGC is a rather complicated process

The transmission is not compatible with A3E

The receiver cannot use a phase comparator for AFC

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YOUR ANSWER : ?

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

Poor AF response

Diagonal clipping

Negative-peak clipping

Poor AGC operation

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

To help the image frequency rejection

To allow adequate frequency coverage without switching

To permit easier tracking

Because otherwise an intermediate frequency could not be produced

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YOUR ANSWER : ?

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

Single-sideband, reduced-carrier

Single-sideband, full-carrier

Single-sideband, suppressed-carrier

ISB

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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

Increase the frequency stability of the synthesizer

Reduce the number of decades

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