RADIO RECEIVERS QUIZ

Indicate which of the following circuits could not demodulate SSB:

Phase discriminator

Balance modulator

Product modulator

BFO

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Tracking will be improved

The local oscillator need not be extremely stable

Image frequency rejection is very good

The selectivity will be poor

TRUE ANSWER : ?
YOUR ANSWER : ?

One of the following cannot be used to demodulate SSB:

Bipolar transistor balanced modulator

Product detector

Complete phase-shift generator

Diode Balance modulator

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.

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

Leak-type bias must be used

The output must be tuned

TRUE ANSWER : ?
YOUR ANSWER : ?

One of the main functions of the RF amplifier in a superheterodyne receiver is to

Increase the tuning range of the receiver

Improve the rejection of the image frequency

Permit better adjacent-channel rejection

Provide improved tracking

TRUE ANSWER : ?
YOUR ANSWER : ?

In a broadcast superheterodyne receiver, the

Mixer input must be tuned to the signal frequency

Local oscillator frequency is normally double the IF

Local oscillator operates below the signal frequency

RF amplifier normally works at 455 kHz above the carrier frequency

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Sensitivity

Double-spotting

Blocking

Diversion reception

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Fewer tuned circuits

Greater limiting

Much easier alignment

Better linearity

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Diagonal clipping

Negative-peak clipping

Poor AF response

Poor AGC operation

TRUE ANSWER : ?
YOUR ANSWER : ?

In a ratio detector

the linearity is worse than in phase discriminator

the output is twice that obtainable from a similar phase discriminator

stabilization against signal strength variations is provided

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

TRUE ANSWER : ?
YOUR ANSWER : ?