3850029
Beschreibung
Mindmap von Mohammed AbdAlla3586, aktualisiert more than 1 year ago
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Erstellt von Mohammed AbdAlla3586
vor fast 9 Jahre
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RF
Frequencies
- Very low Frequency
- 3 KHZ to 3MHZ
- VLF,LF,MF,
- Very long-range communication (ships at sea, and so forth), commercial AM radio. Ground waves
circle the Earth.
- 3 KHZ to 3MHZ
- High frequency
- 3 to 30 MHz
- HF
- Over-the-horizon communication, Signals reflect from ionosphere.
- 3 to 30 MHz
- Very high frequency
- 30 to 300 MHz
- VHF
- Mobile communication, TV, and commercial FM radio. Line-of-sight required.
- 30 to 300 MHz
- Ultra high frequency
- 300 HZ to 1 GH
- UHF
- Mobile communication and TV. Line-of-sight
required.
- 300 HZ to 1 GH
- Microwave
- 1 to 30 GHz
- MH
- TV and telephone links, satellite links. Line-of-sight
required.
- 1 to 30 GHz
- Millimeter wave:
- 30 to 100 GHz
- MMW
- Very short-range communication. Requires line-of-sight, high absorption in rain and fog.
- 30 to 100 GHz
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