Canadian Advanced pool, section 5-04

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Subelement 5

Transmitters, Modulation and Processing

Section 5-04

AM, single sideband, linearity, two-tone test

5-04-01

What type of signal does a balanced modulator produce?

A.
FM with balanced deviation
Correct Answer
B.
Double sideband, suppressed carrier
C.
Full carrier
D.
Single sideband, suppressed carrier

5-04-01

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5-04-02

How can a single-sideband phone signal be produced?

A.
By driving a product detector with a DSB signal
B.
By using a loop modulator followed by a mixer
Correct Answer
C.
By using a balanced modulator followed by a filter
D.
By using a reactance modulator followed by a mixer

5-04-02

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5-04-03

Carrier suppression in a single-sideband transmitter takes place in:

A.
the carrier decouple stage
Correct Answer
B.
the balanced modulator stage
C.
the mechanical filter
D.
the frequency multiplier stage

5-04-03

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5-04-04

Transmission with SSB, as compared to conventional AM transmission, results in:

A.
6 dB gain in the receiver
Correct Answer
B.
6 dB gain in the transmitter and 3 dB gain in the receiver
C.
a greater bandpass requirement in the receiver
D.
3 db gain in the transmitter

5-04-04

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5-04-05

The peak power output of a singlesideband transmitter, when being tested by a two-tone generator is:

A.
equal to the RF peak output power of any of the tones
B.
one-half of the RF peak output power of any of the tones
Correct Answer
C.
twice the RF power output of any of the tones
D.
one-quarter of the RF peak output power of any of the tones

5-04-05

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5-04-06

What kind of input signal is used to test the amplitude linearity of a singlesideband phone transmitter while viewing the output on an oscilloscope?

A.
An audio-frequency sine wave
Correct Answer
B.
Two audio-frequency sine waves
C.
An audio-frequency square wave
D.
Normal speech

5-04-06

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5-04-07

When testing the amplitude linearity of a single-sideband microphone input and on what audio tones are fed into the transmitter, what kind of kind of instrument is the output observed?

Correct Answer
A.
Two non-harmonically related tones are fed in, and the output is observed on an oscilloscope
B.
Two harmonically related tones are fed in, and the output is observed on an oscilloscope
C.
Two harmonically related tones are fed in, and the output is observed on a distortion analyzer
D.
Two non-harmonically related tones are fed in, and the output is observed on a distortion analyzer

5-04-07

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5-04-08

What audio frequencies are used in a two-tone test of the linearity of a singlesideband phone transmitter?

A.
20 Hz and 20 kHz tones must be used
B.
1200 Hz and 2400 Hz tones must be used
C.
Any two audio tones may be used, but they must be within the transmitter audio passband, and must be harmonically related
Correct Answer
D.
Any two audio tones may be used, but they must be within the transmitter audio passband, and should not be harmonically related

5-04-08

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5-04-09

What measurement can be made of a single-sideband phone transmitter's amplifier by performing a two-tone test using an oscilloscope?

A.
Its frequency deviation
B.
Its percent of carrier phase shift
Correct Answer
C.
Its linearity
D.
Its percent of frequency modulation

5-04-09

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5-04-10

How much is the carrier suppressed below peak output power in a singlesideband phone transmission?

Correct Answer
A.
At least 40 dB
B.
No more than 20 dB
C.
No more than 30 dB
D.
At least 60 dB

5-04-10

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5-04-11

What is meant by flattopping in a singlesideband phone transmission?

Correct Answer
A.
Signal distortion caused by excessive drive
B.
Signal distortion caused by insufficient collector current
C.
The transmitter's automatic level control is properly adjusted
D.
The transmitter's carrier is properly suppressed

5-04-11

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