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Crystal and frequency control glossary
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GaAs
Abbreviation for gallium arsenide.
Gain
A measure of the ability of an antenna to receive radio frequency
signals, which is related to physical size. The larger the antenna,
the higher the gain and the higher the received signal level, in general.
An increase in signal power denoted in dbs.
GaN
Abbreviation for gallium nitride.
Gaussian function
A mathematical function used to design a filter which passes a step
function with zero overshoot with maximum rise time.
Geometry
The shape of the resonator plate used in a crystal unit. There are
three (3) geometrical forms available: flat, contoured,
and beveled.
Geosynchronous satellite
A satellite that orbits the Earth during the same period of time in
which the Earth rotates, maintaining a fixed orbit, about 24,000 miles
above the Earth.
GFSK
Abbreviation for Gaussian filtered frequency shift
keying.
Gigahertz (GHz)
A unit of frequency equal to one billion cycles (or Hertz)
per second.
Global Navigation System (GLONASS)
A Russian satellite location technology similar to GPS,
global positioning system.
Global positioning system (GPS)
A series of 24 geosynchronous satellites that continuously transmit
their position. Used in personal tracking, navigation and automatic
vehicle location technologies. See GLONASS.
Global system for mobile communication (GSM)
A public, all-digital cellular network that is standardized worldwide
and that uses TDMA techniques for multiplexing at approximately 900
MHz, compressed voice at about 13 kb/s, 16 kb/s circuit-switching technology,
and error-correcting algorithms.
GMSK
Abbreviation for Gaussian minimum shift keying.
GPIB
Abbreviation for general-purpose interface bus.
GPRS
Abbreviation for general packet radio service.
Grounded base butler
Oscillator commonly used in the range from 20 to 100 MHz. The circuit
is capable of delivering high output power, has medium frequency stability.
These are basically amplifiers with a tapped capacitor resonant circuit
in the collector.
Group delay distortion
The difference between maximum and minimum group delay in the passband.
Group delay
The time taken for a narrow band signal to pass from the input to the
output of a device.
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