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Les fréquences
Fréquence & période
Formules de calculs de fréquences et de périodes
Symbole | Nom | Valeurs | Formule |
f | Fréquence |
- Hz (Hertz)
- 103Hz = KHz (Kilo Hertz)
- 106Hz = MHz (Méga Hertz)
- 109Hz = GHz (Giga Hertz)
T | Période |
- s (seconde)
- 10-3s = ms (milli seconde)
- 10-6s = µs (micro seconde)
Exemples de calculs de fréquences
T=20ms => 1/(20.10-3) = 103/20 = 102/2 = 100/2 = 50 Hz
T=125µs => 1/(125.10-6) = 10-6/125 = 1000000/125 = 8 KHz
f=62,5Hz => 1/62,5 = (1000/103).16 = 16 ms.
Tranches du spectre de fréquences
| Fréquences | Domaine d'application de ces fréquences |
| 3 -> 30 KHz | VLF (Very low frequency). |
| 30 -> 300 KHz | LF (Low frequency). |
| 150 -> 300 KHz | Partie de LF qui comprend les ondes longues (radio civile). |
| 300 KHz-> 3 MHz | MF (Medium frequency) |
| 500 -> 1500 KHz | Partie de MF qui comprend les ondes moyennes (radio civile). |
| 3 -> 30 MHz | HF (High frequency). Ondes courtes. |
| 27 MHz | CB (radio amateur). |
| 30 -> 300 MHz | VHF (Very high frequency). |
| 30 -> 88 MHz | Télévision (bande 1). |
| 88 -> 108 MHz | Bande FM civile |
| 108 -> 150 MHz | Bande réservée à l'aviation. |
| 150 -> 170 MHz | Bande réservée aux pompiers, ambulances, police, taxi. |
| 170 -> 230 MHz | Télévision (bande 2). |
| 230 -> 400 MHz | Bande réservée à l'aviation. |
| 300 MHz -> 3 GHz | UHF (Ultra high frequency). |
| 390 -> 1550 MHz | Bande L |
| 460 -> 860 MHz | Télévision (bande UHF). |
| 900 MHz | GSM |
| 1,2 GHz | GPS |
| 1 -> 8 GHz | Satcom |
| 1550 MHz-> 3,9 GHz | Bande S |
| 3,9 -> 6,2 GHz | Bande C (par exemple : Bemilcom) |
| 3 -> 30 GHz | SHF (Supra high frequency). |
| 6,2-> 10,9 GHz | Bande X (dont Satcom) |
| 19 -> 20 GHz | Bande KU (TV Sat). |
| 30 -> 300 GHz | EHF (Extremly high frequency). |
| 300 -> 3000 GHz | ESHF (Extremly supra high frequency). |
English translation
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Document created the 20/07/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/frequences.html
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