However, very high antennas with high gain have shown 33 centimeters can provide good long-range communications almost equal to systems on lower frequencies such as the 70 centimeter band. The band is also used by industrial, scientific, and medical ISM equipment, as well as low-powered unlicensed devices. Amateur stations must accept harmful interference caused by ISM users  but may receive protection from unlicensed devices. More: Mobile phone radiation and health section. The 33 centimeter band has a somewhat short history, being one of the newest amateur radio bands.
A loose compilation of notes always undergoing editing - Please mirror, link to, reprint as desired. The 33 centimeter ham radio band was born in As part of that proceeding, the band was also allocated to the Amateur Radio Service on a secondary basis. This means hams can use the band as long as they accepted interference from and did not cause interference to this primary user. They radiate only and do not receive therefore it is highly unlikely that you would ever interfere with an ISM device.
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