Industrial, Scientific, and Medical, or ISM refers to a group of radio bands (frequencies) or parts of the radio spectrum that are internationally reserved for RF energy intended for scientific, medical, and industrial requirements. In the United States, this usually includes 433 MHz, 915 MHz, 1.2 GHz, 2.4 GHz, and 5.8 GHz bands.

Référence - Guide technologique du DHS sur les contre-systèmes aériens

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