Radio
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Lo spettro elettromagnetico
la lunghezza d'onda e la frequenza
atmosfera
Lo spettro radio
Le bande
| Band Number | Symbols | Frequency Range | Wavelength Range† |
|---|---|---|---|
| 4 | VLF | 3 to 30 kHz | 10 to 100 km |
| 5 | LF | 30 to 300 kHz | 1 to 10 km |
| 6 | MF | 300 to 3000 kHz | 100 to 1000 m |
| 7 | HF | 3 to 30 MHz | 10 to 100 m |
| 8 | VHF | 30 to 300 MHz | 1 to 10 m |
| 9 | UHF | 300 to 3000 MHz | 10 to 100 cm |
| 10 | SHF | 3 to 30 GHz | 1 to 10 cm |
| 11 | EHF | 30 to 300 GHz | 1 to 10 mm |
| 12 | THF | 300 to 3000 GHz | 0.1 to 1 mm |