RADIO RECEIVERS QUIZ

The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to

Increase the frequency stability of the synthesizer

Reduce the number of decades

Reduce the number of crystals required

Reduce the spurious frequency problem

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Better linearity

Fewer tuned circuits

Greater limiting

Much easier alignment

TRUE ANSWER : ?
YOUR ANSWER : ?

Indicate which of the following circuits could not demodulate SSB:

BFO

Phase discriminator

Balance modulator

Product modulator

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Production of AGC is a rather complicated process

The receiver cannot use a phase comparator for AFC

The transmission is not compatible with A3E

Adjacent-channel rejection is more difficult

TRUE ANSWER : ?
YOUR ANSWER : ?

Indicate the false statement in connection with communications receivers.

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

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

TRUE ANSWER : ?
YOUR ANSWER : ?

The image frequency of a superheterodyne receiver

Is created within the receiver itself

Is due to insufficient adjacent channel rejection

Is not rejected be the IF tuned circuits

Is independent of the frequency to which the receiver is tuned

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 allow adequate frequency coverage without switching

Because otherwise an intermediate frequency could not be produced

To permit easier tracking

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Reducing the effect of negative-peak clipping

Improving the effectiveness of the AGC

Improving the selectivity of the receiver

Reducing the effect of noise at low modulation depths

TRUE ANSWER : ?
YOUR ANSWER : ?

Three-point tracking is achieved with

Double conversion

Variable selectivity

The padder capacitor

Double spotting

TRUE ANSWER : ?
YOUR ANSWER : ?

When a receiver has good blocking performance, this means that

It does not suffer from double-spotting

Its detector suffers from burnout

It is unaffected by AGC derived from nearby transmissions

Its image frequency rejection is poor

TRUE ANSWER : ?
YOUR ANSWER : ?