- Published in issue 4/1993 on page 40
Wideband wireless data systems
Radiocommunications equipment forPMR or ISM applications is designed for narrow-band channels. In the majority of European countries this means a channel spacing of 12.5 kHz or 25 kHz, where the carrier frequeney of a channel is 12.5 kHz or 25 kHz away from the car-rier frequencies on the upper and lower adjacent channels. The method of modulation is generally FM and the maximum frequency deviation is 2.5 kHz or 5.0 kHz respectively.