RADIO RECEIVERS QUIZ

In a ratio detector

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

stabilization against signal strength variations is provided

the linearity is worse than in phase discriminator

the output is twice that obtainable from a similar phase discriminator

TRUE ANSWER : ?
YOUR ANSWER : ?

The image frequency of a superheterodyne receiver

Is due to insufficient adjacent channel rejection

Is independent of the frequency to which the receiver is tuned

Is not rejected be the IF tuned circuits

Is created within the receiver itself

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 : ?

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

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

Leak-type bias must be used

The output must be tuned

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

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 : ?

In a broadcast superheterodyne receiver, the

Mixer input must be tuned to the signal frequency

Local oscillator operates below the signal frequency

Local oscillator frequency is normally double the IF

RF amplifier normally works at 455 kHz above the carrier frequency

TRUE ANSWER : ?
YOUR ANSWER : ?

Three-point tracking is achieved with

Double conversion

Variable selectivity

The padder capacitor

Double spotting

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Sensitivity

Blocking

Double-spotting

Diversion reception

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Tracking will be improved

The selectivity will be poor

Image frequency rejection is very good

The local oscillator need not be extremely stable

TRUE ANSWER : ?
YOUR ANSWER : ?

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 decades

Reduce the number of crystals required

Reduce the spurious frequency problem

Increase the frequency stability of the synthesizer

TRUE ANSWER : ?
YOUR ANSWER : ?

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