Canadian Advanced pool, section 6-05

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Subelement 6

Receivers

Section 6-05

performance limitations - instability, image, spurious, etc.

6-05-01

What part of a superheterodyne receiver determines the image rejection ratio of the receiver?

A.
Product detector
B.
AGC loop
C.
IF filter
Correct Answer
D.
RF amplifier

6-05-01

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6-05-02

What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

A.
Cross-modulation interference
Correct Answer
B.
Desensitization
C.
Squelch gain rollback
D.
Quieting

6-05-02

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6-05-03

What causes receiver desensitization?

A.
Squelch gain adjusted too high
B.
Squelch gain adjusted too low
Correct Answer
C.
Strong adjacent channel signals
D.
Audio gain adjusted too low

6-05-03

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6-05-04

What is one way receiver desensitization can be reduced?

A.
Decrease the receiver squelch gain
Correct Answer
B.
Shield the receiver from the transmitter causing the problem
C.
Increase the receiver bandwidth
D.
Increase the transmitter audio gain

6-05-04

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6-05-05

What causes intermodulation in an electronic circuit?

Correct Answer
A.
Nonlinear circuits or devices
B.
Too little gain
C.
Positive feedback
D.
Lack of neutralization

6-05-05

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6-05-06

Which of the following is an important reason for using a VHF intermediate frequency in an HF receiver?

Correct Answer
A.
To move the image response far away from the filter passband
B.
To provide a greater tuning range
C.
To tune out cross-modulation distortion
D.
To prevent the generation of spurious mixer products

6-05-06

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6-05-07

Intermodulation distortion is produced by:

A.
the interaction of products from highpowered transmitters in the area
Correct Answer
B.
the mixing of more than one signal in the mixer of a superheterodyne receiver
C.
the high-voltage stages in the final amplifier of an amplitude or frequencymodulated transmitter
D.
the mixing of more than one signal in the first or second intermediate frequency amplifiers of a receiver

6-05-07

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6-05-08

Three of the following answers are direct causes of instability in a receiver. Choose the answer which is Not a direct cause:

A.
mechanical strength
B.
feedback components
C.
temperature
Correct Answer
D.
dial tracking

6-05-08

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6-05-09

Poor stability in a receiver usually originates in the:

A.
detector
Correct Answer
B.
local oscillator and power supply
C.
RF amplifier
D.
mixer

6-05-09

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6-05-10

Poor dynamic range of a receiver can cause many problems when a strong signal appears within the front-end bandpass or even outside it. Which of the following is Not caused as a direct result?

A.
Desensitization
B.
Intermodulation
C.
Cross-modulation
Correct Answer
D.
Feedback

6-05-10

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6-05-11

If a receiver mixes a 13.800-MHz VFO with a 14.255-MHz received signal to produce a 455-kHz intermediate frequency (IF) signal, what type of interference will a 13.345-MHz signal produce in the receiver?

A.
Intermediate interference
B.
Mixer interference
Correct Answer
C.
Image response
D.
Local oscillator

6-05-11

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