Canadian Basic pool, section 7-08

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Subelement 7

Radio Wave Propagation

Section 7-08

scatter - HF, VHF, UHF

7-08-01

What kind of propagation would best be used by two stations within each other's skip zone on a certain frequency?

A.
Scatter-mode
B.
Sky-wave
C.
Ducting
Correct Answer
D.
Ground-wave

7-08-01

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7-08-02

If you receive a weak, distorted signal from a distance, and close to the maximum usable frequency, what type of propagation is probably occurring?

A.
Ground-wave
B.
Line-of-sight
Correct Answer
C.
Scatter
D.
Ducting

7-08-02

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7-08-03

What is a characteristic of HF scatter signals?

A.
Reversed modulation
Correct Answer
B.
A wavering sound
C.
Reversed sidebands
D.
High intelligibility

7-08-03

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7-08-04

What makes HF scatter signals often sound distorted?

Correct Answer
A.
Energy scattered into the skip zone through several radio-wave paths
B.
Auroral activity and changes in the earth's magnetic field
C.
Propagation through ground waves that absorb much of the signal
D.
The state of the E-region at the point of refraction

7-08-04

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7-08-05

Why are HF scatter signals usually weak?

A.
Propagation through ground waves absorbs most of the signal energy
Correct Answer
B.
Only a small part of the signal energy is scattered into the skip zone
C.
The F region of the ionosphere absorbs most of the signal energy
D.
Auroral activity absorbs most of the signal energy

7-08-05

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7-08-06

What type of radio-wave propagation allows a signal to be detected at a distance too far for ground-wave propagation but too near for normal skywave propagation?

A.
Short-path skip
B.
Sporadic-E skip
Correct Answer
C.
Scatter
D.
Ground wave

7-08-06

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7-08-07

When does scatter propagation on the HF bands most often occur?

A.
When the sunspot cycle is at a minimum and D-region absorption is high
B.
At night
C.
When the F1 and F2 regions are combined
Correct Answer
D.
When communicating on frequencies above the maximum usable frequency (MUF)

7-08-07

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7-08-08

Which of the following is not a scatter mode?

A.
Meteor scatter
B.
Tropospheric scatter
C.
Ionospheric scatter
Correct Answer
D.
Absorption scatter

7-08-08

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7-08-09

Meteor scatter is most effective on what band?

A.
40 metres
Correct Answer
B.
6 metres
C.
15 metres
D.
160 metres

7-08-09

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7-08-10

Which of the following is not a scatter mode?

A.
Side scatter
B.
Back scatter
Correct Answer
C.
Inverted scatter
D.
Forward scatter

7-08-10

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7-08-11

In which frequency range is meteor scatter most effective for extended-range communication?

Correct Answer
A.
30 - 100 MHz
B.
10 - 30 MHz
C.
3 - 10 MHz
D.
100 - 300 MHz

7-08-11

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