Mobile phones

Mobile phones

Industry: Mobile communications

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Mobile phones

specialized mobile radio (SMR)

Mobile communications; Mobile phones

Dispatch service ("walkie-talkie-type" service used by taxis, delivery trucks, etc.). SMR providers in the United States operate in the 800 MHz and 900 MHz frequency bands.

specific absorption rate (SAR)

Mobile communications; Mobile phones

A measure of the rate at which RF energy is absorbed by the body.

spectrum

Mobile communications; Mobile phones

The range of electromagnetic radio frequencies used in the transmission of sound, data and television.

Federal government assignment of a range of frequencies for a category of use or uses. For example, the FCC allocated the 1900 MHz band for personal communications services. Allocation, accomplished ...

spectrum assignment

Mobile communications; Mobile phones

Federal government authorization for use of specific frequencies or frequency pairs within a given allocation, at specific geographic locations.

spectrum cap

Mobile communications; Mobile phones

A limit to the allocated spectrum designated for a specific service.

spread spectrum

Mobile communications; Mobile phones

Initially devised for military use, this radio transmission technology "spreads" information over greater bandwidth than necessary to resist jamming and other interference.