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In 1985, the Federal Communications Commission allocated the frequency band between 902 and 928 MHz to Part 18 ISM (Industrial, Scientific, and Medical) devices. The Radio Regulations of the International Telecommunication Union allow amateur radio operations in the frequency range from 902.0 to 928.0 MHz. The 33–centimeter band has a somewhat short history, being one of the newest amateur radio bands.
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More: Mobile phone radiation and health section. humans are exposed to these frequencies over a certain span of time. the four bands 850 / 900 / 1,800 / 1,900 MHz – which many GSM phones support and mobile phone operators use - used by all mobile phone operators at the same time to a certain space where e.g. to express the total power or impact of the electric field "E" - expressed in V/m - or the power density "S" - expressed in W/m 2 - of the overall cellular frequencies emission caused by all frequencies s.a. The 900 MHz frequency is also used as a reference band e.g. Amateur stations must accept harmful interference caused by ISM users but may receive protection from unlicensed devices. The band is also used by industrial, scientific, and medical (ISM) equipment, as well as low-powered unlicensed devices. 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. It is primarily used for very local communications as opposed to bands lower in frequency. It ranges from 902 to 928 MHz and is unique to ITU Region 2.
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The 33-centimeter or 900 MHz band is a portion of the UHF radio spectrum internationally allocated to amateur radio on a secondary basis. JSTOR ( August 2011) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "33-centimeter band" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.