RADIO RECEIVERS QUIZ

When a receiver has good blocking performance, this means that

Its detector suffers from burnout

Its image frequency rejection is poor

It is unaffected by AGC derived from nearby transmissions

It does not suffer from double-spotting

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YOUR ANSWER : ?

If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of

Improving the effectiveness of the AGC

Reducing the effect of negative-peak clipping

Reducing the effect of noise at low modulation depths

Improving the selectivity of the receiver

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YOUR ANSWER : ?

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 : ?

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

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Leak-type bias must be used

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

The output must be tuned

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

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YOUR ANSWER : ?

Indicate which of the following statements about the advantages of the phase discriminator over the slope detector is false:

Greater limiting

Better linearity

Fewer tuned circuits

Much easier alignment

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YOUR ANSWER : ?

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

Poor AGC operation

Diagonal clipping

Negative-peak clipping

Poor AF response

TRUE ANSWER : ?
YOUR ANSWER : ?

In a broadcast superheterodyne receiver, the

Local oscillator operates below the signal frequency

RF amplifier normally works at 455 kHz above the carrier frequency

Local oscillator frequency is normally double the IF

Mixer input must be tuned to the signal frequency

TRUE ANSWER : ?
YOUR ANSWER : ?

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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YOUR ANSWER : ?

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

The transmission is not compatible with A3E

The receiver cannot use a phase comparator for AFC

Production of AGC is a rather complicated process

Adjacent-channel rejection is more difficult

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YOUR ANSWER : ?