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Crystal and frequency control glossary

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U

Ultra-high frequency (UHF)

The part of the radio spectrum from 300 to 3000 MHz that includes TV channels 14-83, as well as many land mobile and satellite services.

Ultra-low frequency (ULF)

Frequencies from 300 Hz to 3000 Hz.

Uni-directional antenna

Antenna that radiates most of its power in one direction.

Unity

The factor of one.

Universal asynchronous receiver transmitter (UART)

The microchip with programming that controls a computer's interface to its attached serial devices. Specifically, it provides the computer with the RS-232C Data Terminal Equipment (DTE) interface so that it can "talk" to and exchange data with modems and other serial devices.

Universal mobile telecommunications service (UMTS)

Universal mobile telecommunications service is a so-called "third-generation (3G)," broadband, packet-based transmission of text, digitized voice, video, and multimedia at data rates up to 2 megabits per second (Mbps) that will offer a consistent set of services to mobile computer and phone users no matter where they are located in the world. Based on the GSM (Global System for Mobile communication), UMTS, endorsed by major standards bodies and manufacturers, is the planned standard for mobile users around the world by 2002.

Unwanted response

Frequency responses other than the main, or desired response, which the crystal elements have.

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Numeric | A | B | C | D | E | F | G | H | I | J | K
L | M | N | O | P | Q | R | S | T | U | V | W | XYZ

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Quartz Crystals Precision Telemetry Crystal Products
International Crystal Manufacturing
10 North Lee Avenue Oklahoma City, OK 73102
Toll Free Phone: 1-800-725-1426 Toll Free Fax: 1-800-322-9426
Phone: 1-405-236-3741 Fax: 1-405-235-1904
Email: customerservice@icmfg.com

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