RADIO RECEIVERS QUIZ

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

It does not require crystal oscillator

It is relatively free of spurious frequency

Its frequency stability is better

It is a simpler piece of equipment

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The image frequency of a superheterodyne receiver

Is independent of the frequency to which the receiver is tuned

Is not rejected be the IF tuned circuits

Is due to insufficient adjacent channel rejection

Is created within the receiver itself

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One of the following cannot be used to demodulate SSB:

Complete phase-shift generator

Bipolar transistor balanced modulator

Diode Balance modulator

Product detector

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The typical squelch circuit cuts off

An IF amplifier when the AGC is maximum

RF interference when the signal is weak

An IF amplifier when the AGC is minimum

an audio amplifier when the carrier is absent

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Indicate the false statement in connection with communications receivers.

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

Double conversion is used to improve image rejection

Variable sensitivity is used to eliminate selective fading

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

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

The selectivity will be poor

The local oscillator need not be extremely stable

Image frequency rejection is very good

Tracking will be improved

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Three-point tracking is achieved with

Double conversion

Double spotting

Variable selectivity

The padder capacitor

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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 receiver cannot use a phase comparator for AFC

The transmission is not compatible with A3E

Production of AGC is a rather complicated process

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In a ratio detector

the output is twice that obtainable from a similar phase discriminator

the linearity is worse than in phase discriminator

stabilization against signal strength variations is provided

the circuit is the same as in a discriminator, except that the diodes are reversed

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

Negative-peak clipping

Poor AGC operation

Diagonal clipping

Poor AF response

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