Thomas Kunz
Systems and Computer Engineering
45
Bluetooth Radio
nfrequency
hopping in 79 hops displaced by 1 MHz, starting at 2.402 GHz and stopping at 2.480 GHz
–to
function on a worldwide basis, Bluetooth requires a radio frequency that is license-free and open to any
radio
–2.45 GHz ISM band satisfies these requirements, although
it must cope with interference
from baby monitors, garage door openers, cordless phones and microwave ovens, which also use this
frequency.
ndue to local
regulations the bandwidth is reduced in Japan, France and Spain. This is handled by an internal
software switch
nthe
maximum frequency hopping rate is 1600 hops/s.