RADIO RECEIVERS QUIZ

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

Tracking will be improved

The selectivity will be poor

The local oscillator need not be extremely stable

Image frequency rejection is very good

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YOUR ANSWER : ?

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

ISB

Single-sideband, full-carrier

Single-sideband, reduced-carrier

Single-sideband, suppressed-carrier

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YOUR ANSWER : ?

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

The receiver cannot use a phase comparator for AFC

Production of AGC is a rather complicated process

The transmission is not compatible with A3E

Adjacent-channel rejection is more difficult

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YOUR ANSWER : ?

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

Increase the frequency stability of the synthesizer

Reduce the number of decades

Reduce the number of crystals required

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YOUR ANSWER : ?

One of the following cannot be used to demodulate SSB:

Bipolar transistor balanced modulator

Diode Balance modulator

Complete phase-shift generator

Product detector

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YOUR ANSWER : ?

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

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

The output must be tuned

Leak-type bias must be used

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

TRUE ANSWER : ?
YOUR ANSWER : ?

The image frequency of a superheterodyne receiver

Is due to insufficient adjacent channel rejection

Is independent of the frequency to which the receiver is tuned

Is created within the receiver itself

Is not rejected be the IF tuned circuits

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YOUR ANSWER : ?

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

Because otherwise an intermediate frequency could not be produced

To permit easier tracking

To allow adequate frequency coverage without switching

To help the image frequency rejection

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YOUR ANSWER : ?

When a receiver has good blocking performance, this means that

Its detector suffers from burnout

It does not suffer from double-spotting

Its image frequency rejection is poor

It is unaffected by AGC derived from nearby transmissions

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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

Poor AGC operation

Negative-peak clipping

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YOUR ANSWER : ?