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Radio > HF > Flashcards

HF Flashcards

1
Q

What is the other band name for HF?

A

Decametre band

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2
Q

What does HF stand for?

A

High frequency

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3
Q

What is the wavelength range for HF?

A

100 m - 10 m

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4
Q

What is the frequency range for HF?

A

3 MHz - 30 MHz

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5
Q

What ITU designation is below HF?

A

MF

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6
Q

What ITU designation is above HF?

A

VHF

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7
Q

What kind of obstacles block HF frequencies?

A
  • sunlight
  • solar terminator
  • sunspot
  • solar activity
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8
Q

What are the different types of HF antenna?

A
  • wire diapoles
  • rhombic
  • Yagi
  • quad
  • log-periodic
  • curtain arrays
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9
Q

What are the three types of propagation HF uses?

A
  • Ground wave
  • Direct wave
  • Sky wave
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10
Q

What is the normal maximum distance for ground wave?

A

Short distance <20Km

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11
Q

What is the normal maximum distance for direct wave?

A

Long distance

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12
Q

What is the normal maximum distance for sky wave?

A

Long distance

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13
Q

Describe the the propagation of groundwave

A

Follows the curvature of the earth

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14
Q

Describe the the propagation of direct wave

A

Line of sight between ground to ground or ground to air communications.

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15
Q

Describe the the propagation of sky wave

A

Uses the Ionosphere to reflect the signal back to earth

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16
Q

What is the layer in the earth’s atmosphere that refracts radio waves back to earth?

A

Ionosphere

17
Q

What is the skip zone?

A

Where the groundwave ends and the skywave starts . Radio wave are not present in this area.

18
Q

What component of the radio is responsible for the coverage area?

A

The angle of the antenna.

19
Q

Describe the Ionosphere

A

The ionosphere is the ionized part of Earth’s upper atmosphere, from about 48 km to 965 km altitude. It contains multiple layers.

20
Q

What is the name of the closest layer of the Ionosphere?

A

D

21
Q

What is the name of the farthest layer of the Ionosphere?

A

F2

22
Q

What are the most common layers used for signal propagation?

A

F1 & F2

Radio (3 decks)

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