Canadian Advanced pool, section 6-01

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Subelement 6

Receivers

Section 6-01

single, double conversion superheterodyne architecture

6-01-01

What are the advantages of the frequency-conversion process in a superheterodyne receiver?

A.
Automatic detection in the RF amplifier and increased sensitivity
B.
Automatic soft-limiting and automatic squelching
Correct Answer
C.
Increased selectivity and optimal tuned circuit design
D.
Automatic squelching and increased sensitivity

6-01-01

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6-01-02

What factors should be considered when selecting an intermediate frequency?

Correct Answer
A.
Image rejection
B.
Noise figure and distortion
C.
Interference to other services
D.
Cross-modulation distortion and interference

6-01-02

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6-01-03

One of the greatest advantages of the double-conversion over the singleconversion receiver is that it:

A.
is much more stable
B.
is much more sensitive
Correct Answer
C.
suffers less from image interference
D.
produces a louder signal at the output

6-01-03

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6-01-04

In a communications receiver, a crystal filter would be located in the:

Correct Answer
A.
IF circuits
B.
local oscillator
C.
audio output stage
D.
detector

6-01-04

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6-01-05

A multiconversion superheterodyne receiver is more susceptible to spurious responses than a single-conversion receiver because of the:

Correct Answer
A.
additional oscillators and mixing frequencies involved in the design
B.
poorer selectivity in the IF caused by the multitude of frequency changes
C.
greater sensitivity introducing higher levels of RF to the receiver
D.
AGC being forced to work harder causing the stages concerned to overload

6-01-05

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6-01-06

Most superheterodyne receivers operating on the HF amateur bands through to 30 MHz use a standard intermediate frequency (IF) of:

A.
200 kHz
Correct Answer
B.
455 kHz
C.
500 kHz
D.
355 kHz

6-01-06

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6-01-07

Which stage of a receiver has its input and output circuits tuned to the received frequency?

A.
The local oscillator
B.
The audio frequency amplifier
C.
The detector
Correct Answer
D.
The RF amplifier

6-01-07

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6-01-08

Which stage of a superheterodyne receiver lies between a tuneable stage and a fixed tuned stage?

A.
Radio frequency amplifier
B.
Intermediate frequency amplifier
C.
Local oscillator
Correct Answer
D.
Mixer

6-01-08

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6-01-09

A single conversion receiver with a 9 MHz IF has a local oscillator operating at 16 MHz. The frequency it is tuned to is:

A.
16 MHz
B.
21 MHz
C.
9 MHz
Correct Answer
D.
7 MHz

6-01-09

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6-01-10

A double conversion receiver designed for SSB reception has a beat frequency oscillator and:

A.
one IF stage and one local oscillator
Correct Answer
B.
two IF stages and two local oscillators
C.
two IF stages and three local oscillators
D.
two IF stages and one local oscillator

6-01-10

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6-01-11

The advantage of a double conversion receiver over a single conversion receiver is that it:

A.
does not drift off frequency
Correct Answer
B.
suffers less from image interference
C.
is a more sensitive receiver
D.
produces a louder audio signal

6-01-11

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