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Crystal and frequency control glossary
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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.
Numeric | A
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| D | E
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| J | K
L | M
| N | O
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| R | S
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| XYZ
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International Crystal Manufacturing
10 North Lee Avenue • Oklahoma City, OK
73102
Toll Free Phone: 1-800-725-1426 • Toll Free
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