RADIO RECEIVERS QUIZ

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

900 kHz

750 kHz

1650 kHz

2100 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

The transmission is not compatible with A3E

Production of AGC is a rather complicated process

The receiver cannot use a phase comparator for AFC

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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 number of crystals required

Reduce the number of decades

Reduce the spurious frequency problem

Increase the frequency stability of the synthesizer

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When a receiver has good blocking performance, this means that

Its image frequency rejection is poor

Its detector suffers from burnout

It is unaffected by AGC derived from nearby transmissions

It does not suffer from double-spotting

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YOUR ANSWER : ?

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

Its frequency stability is better

It does not require crystal oscillator

It is relatively free of spurious frequency

It is a simpler piece of equipment

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

Squelch

Double conversion

Variable selectivity

Variable sensitivity

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

Tracking will be improved

Image frequency rejection is very good

The local oscillator need not be extremely stable

The selectivity will be poor

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YOUR ANSWER : ?

The image frequency of a superheterodyne receiver

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

Is due to insufficient adjacent channel rejection

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YOUR ANSWER : ?

Indicate the false statement in connection with communications receivers.

A product demodulator could be used for the reception of Morse code.

Double conversion is used to improve image rejection

The noise limiter cuts off the receiver’s output during a noise pulse.

Variable sensitivity is used to eliminate selective fading

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

Poor AGC operation

Negative-peak clipping

Poor AF response

Diagonal clipping

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