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)
|
f = 1 / T |
T | Période |
  • s (seconde)
  • 10-3s = ms (milli seconde)
  • 10-6s = µs (micro seconde)
|
T = 1 / f |

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

Spectre de fréquences 
FréquencesDomaine d'application de ces fréquences
3 -> 30 KHzVLF (Very low frequency).
30 -> 300 KHzLF (Low frequency).
150 -> 300 KHzPartie de LF qui comprend les ondes longues (radio civile).
300 KHz-> 3 MHzMF (Medium frequency)
500 -> 1500 KHzPartie de MF qui comprend les ondes moyennes (radio civile).
3 -> 30 MHzHF (High frequency).
Ondes courtes.
27 MHzCB (radio amateur).
30 -> 300 MHzVHF (Very high frequency).
30 -> 88 MHzTélévision (bande 1).
88 -> 108 MHzBande FM civile
108 -> 150 MHzBande réservée à l'aviation.
150 -> 170 MHzBande réservée aux pompiers, ambulances, police, taxi.
170 -> 230 MHzTélévision (bande 2).
230 -> 400 MHzBande réservée à l'aviation.
300 MHz -> 3 GHzUHF (Ultra high frequency).
390 -> 1550 MHzBande L
460 -> 860 MHzTélévision (bande UHF).
900 MHzGSM
1,2 GHzGPS
1 -> 8 GHzSatcom
1550 MHz-> 3,9 GHzBande S
3,9 -> 6,2 GHzBande C (par exemple : Bemilcom)
3 -> 30 GHzSHF (Supra high frequency).
6,2-> 10,9 GHzBande X (dont Satcom)
19 -> 20 GHzBande KU (TV Sat).
30 -> 300 GHzEHF (Extremly high frequency).
300 -> 3000 GHzESHF (Extremly supra high frequency).

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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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