ISM Band - ISM Bands

ISM Bands

The ISM bands are defined by the ITU-R in 5.138, 5.150, and 5.280 of the Radio Regulations. Individual countries' use of the bands designated in these sections may differ due to variations in national radio regulations. Because communication devices using the ISM bands must tolerate any interference from ISM equipment, unlicensed operations are typically permitted to use these bands, since unlicensed operation typically needs to be tolerant of interference from other devices anyway. The ISM bands do have licensed operations; however, due to the high likelihood of harmful interference, licensed use of the bands is typically low. In the United States of America, uses of the ISM bands are governed by Part 18 of the FCC rules, while Part 15 contains the rules for unlicensed communication devices, even those that use the ISM frequencies.

The ISM bands defined by the ITU-R are:

Frequency range Bandwidth Center frequency Availability
6.765 MHz 6.795 MHz 30 kHz 6.780 MHz Subject to local acceptance
13.553 MHz 13.567 MHz 14 kHz 13.560 MHz
26.957 MHz 27.283 MHz 326 kHz 27.120 MHz
40.660 MHz 40.700 MHz 40 kHz 40.680 MHz
433.050 MHz 434.790 MHz 1.84 MHz 433.920 MHz Region 1 only and subject to local acceptance
902.000 MHz 928.000 MHz 26 MHz 915.000 MHz Region 2 only
2.400 GHz 2.500 GHz 100 MHz 2.450 GHz
5.725 GHz 5.875 GHz 150 MHz 5.800 GHz
24.000 GHz 24.250 GHz 250 MHz 24.125 GHz
61.000 GHz 61.500 GHz 500 MHz 61.250 GHz Subject to local acceptance
122.000 GHz 123.000 GHz 1 GHz 122.500 GHz Subject to local acceptance
244.000 GHz 246.000 GHz 2 GHz 245.000 GHz Subject to local acceptance

Regulatory authorities may allocate other parts of the radio spectrum for unlicensed communication systems, but these are not ISM bands.

Read more about this topic:  ISM Band

Famous quotes containing the words ism and/or bands:

    Grandpa: Penny, why don’t you write a play about ism-mania?
    Penny: Ism-mania?
    Grandpa: Yeah, sure. You know, communism, fascism, voodooism. Everybody’s got an ism these days.
    Penny: It sounds like an itch or something.
    Grandpa: It’s just as catching. When things go a little bad these days, you go out and get yourself an ism and you’re in business.
    Robert Riskin (1897–1955)

    The thing that struck me forcefully was the feeling of great age about the place. Standing on that old parade ground, which is now a cricket field, I could feel the dead generations crowding me. Here was the oldest settlement of freedmen in the Western world, no doubt. Men who had thrown off the bands of slavery by their own courage and ingenuity. The courage and daring of the Maroons strike like a purple beam across the history of Jamaica.
    Zora Neale Hurston (1891–1960)