Wifi

dBm to mW

10 ^ (dBm / 10)

Fresnel zone

diameter in meter = 17.32 * SQRT ( dist / 4 freq )
dist = KM
freq = GHz

Lengte frequentie

1 hz = 		299792458  m
1000 hz = 	299792.458 m
1000000 hz = 	299.792458 m

lengte in m = snelheid vh licht / hz