Canadian Advanced pool, section 5-07

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Subelement 5

Transmitters, Modulation and Processing

Section 5-07

signal processing - AF, IF, and RF

5-07-01

Maintaining the peak RF output of a SSB transmitter at a relatively constant level requires a circuit called the:

Correct Answer
A.
automatic level control (ALC)
B.
automatic gain control (AGC)
C.
automatic output control (AOC)
D.
automatic volume control (AVC)

5-07-01

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5-07-02

Speech compression associated with SSB transmission implies:

Correct Answer
A.
full amplification of low level signals and reducing or eliminating amplification of high level signals
B.
full amplification of high level signals and reducing or eliminating signals amplification of low level
C.
a lower signal-to-noise ratio
D.
circuit level instability

5-07-02

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5-07-03

Which of the following functions Is Not included in a typical digital signal processor?

Correct Answer
A.
Aliasing amplifier
B.
Analog to digital converter
C.
Digital to analog converter
D.
Mathematical transform

5-07-03

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5-07-04

How many bits are required to provide 256 discrete levels, or a ratio of 256:1?

A.
6 bits
B.
16 bits
Correct Answer
C.
8 bits
D.
4 bits

5-07-04

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5-07-05

Adding one bit to the word length, is equivalent to adding ________ dB to the dynamic range of the digitizer:

A.
1 dB
B.
4 dB
Correct Answer
C.
6 dB
D.
3 dB

5-07-05

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5-07-06

What do you call the circuit which employs an analog to digital converter, a mathematical transform, a digital to analog converter and a low pass filter?

A.
Digital formatter
B.
Mathematical transformer
Correct Answer
C.
Digital signal processor
D.
Digital transformer

5-07-06

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5-07-07

Which principle Is Not associated with analog signal processing?

A.
compression
Correct Answer
B.
frequency division
C.
bandwidth limiting
D.
clipping

5-07-07

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5-07-08

Which of the following Is Not a method used for peak limiting, in a signal processor?

A.
RF clipping
Correct Answer
B.
frequency clipping
C.
compression
D.
AF clipping

5-07-08

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5-07-09

What is the undesirable result of AF clipping in a speech processor?

A.
Reduced average power
B.
Increased average power
Correct Answer
C.
Increased harmonic distortion
D.
Reduction in peak amplitude

5-07-09

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5-07-10

Which description Is Not correct? You are planning to build a speech processor for your transceiver. Compared to AF clipping, RF clipping:

A.
has less distortion
B.
is more expensive to implement
C.
is more difficult to implement
Correct Answer
D.
is easier to implement

5-07-10

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5-07-11

Automatic Level Control (ALC) is another name for:

Correct Answer
A.
RF compression
B.
AF compression
C.
RF clipping
D.
AF clipping

5-07-11

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