RADIO RECEIVERS QUIZ

One of the following cannot be used to demodulate SSB:

Diode Balance modulator

Complete phase-shift generator

Product detector

Bipolar transistor balanced modulator

TRUE ANSWER : ?
YOUR ANSWER : ?

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

To help the image frequency rejection

To permit easier tracking

To allow adequate frequency coverage without switching

Because otherwise an intermediate frequency could not be produced

TRUE ANSWER : ?
YOUR ANSWER : ?

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.

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

TRUE ANSWER : ?
YOUR ANSWER : ?

The image frequency of a superheterodyne receiver

Is not rejected be the IF tuned circuits

Is created within the receiver itself

Is due to insufficient adjacent channel rejection

Is independent of the frequency to which the receiver is tuned

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YOUR ANSWER : ?

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

1650 kHz

2100 kHz

900 kHz

750 kHz

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In a radio receiver with simple AGC

The highest AGC voltage is produced

The faster the AGC time constant the more accurate the output

The audio stage gain is normally controlled by the AGC

An increase in signal strength produces more AGC

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YOUR ANSWER : ?

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

Variable selectivity

Variable sensitivity

Double conversion

Squelch

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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

Adjacent-channel rejection is more difficult

The transmission is not compatible with A3E

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

It does not require crystal oscillator

Its frequency stability is better

It is a simpler piece of equipment

It is relatively free of spurious frequency

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A receiver has poor IF selectivity. It will therefore also have poor

Diversion reception

Blocking

Double-spotting

Sensitivity

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