With the ISM (Industrial, Scientific and Medical equipment) band, use is made of the radio spectrum for non-telecommunication intended purposes, such as for heating / drying / cooking, power transmission, welding, accelerating chemical reactions, etc. Worldwide, there are a number of bandwidths designated that can be used for such applications.
The ISM bandwidths are there for the countries where the R&TTE-directive (1999/05/EG) is applicable, between the following frequency’s;
- 26,9-27,2 MHz
- 40,6-40,7 MHz
- 433,05-434,79 MHz
- 868-870 MHz (the bandwidth is not used within the ISM but is free)
As a rule the use of devices within the ISM-band does not require permission. While the country’s own guidelines, have to be respected. The maximum allowable transmit power within the ISM band is mill watt level.