- G:
- Audio, Video, Communications: see Gain.
- Measurements: see Giga- (G-).
-
- Gain (G)
- Audio, DIY, Video, Communications: The amount of increase in voltage, current and/or power provided to the signal by a device or amplifier. Gain is expressed as a ratio of the amplifier output value to the corresponding amplifier input value.
-
- Gain, Unity
- Audio, Communications: A setting or device that does not amplify or attenuate the audio signal.
-
- Gale
- Weather:
On the beaufort wind scale, a wind with speeds from 28 to 55 knots (32
to 63 miles per hour). For marine interests, it can be categorized as a
moderate gale (28 to 33 knots), a fresh gale (34 to 40 knots), a strong
gale (41 to 47 knots), or a whole gale (48 to 55 knots). In 1964, the
world meteorological organization defined the categories as near gale
(28 to 33 knots), gale (34 to 40 knots), strong gale (41 to 47 knots),
and storm (48 to 55 knots).
-
- Gale Warning
- Weather: A warning for marine interests for impending winds from 28 to 47 knots (32 to 54 miles per hour).
-
- Gang
- Electronics: A potentiometer or other component that has two or more controls coupled together so that they are operated simultaneously.
-
- Gauss
- Measurement: Cgs unit for magnetic flux; equal to the oersted, (statvolt/cm) and (dyne/esu).
-
- General Packet Radio Service: see GPRS.
-
- Geosynchronous
- Satellite: A satellite orbit that maintains a constant position relative to the earth.
-
- Ghosting
- Video: A video reception problem (occurring with analog video signals) characterized by multiple or faint images.
- GHz
- Acronym: Gigahertz, or 1 billion hertz (cycles per second).
-
- Gi-: see gibi- (Gi-).
-
- gibi- ( Gi-)
- Measurement, Computers: New SI / Metric unit of binary measurement, not yet fully adopted, equal to 230 or 1,073,741,824.
-
- GIF
- Acronym: Graphics Interchange Format
- Digital Video: A graphic file format limited to 256 colors that is used mainly for web graphics or small animated files.
-
- Giga
- Measurement: SI / Metric unit of decimal measurement, equal to 109 or 1,000,000,000.
- Measurement, Computers: Unit of binary measurement, equal to 230 or 1, 073, 741, 824.
-
- GLI
- Acronym: Ground Loop Isolation, or Ground Loop Isolator
- Electronics: A device placed in-line with an audio or video connection in order to eliminate AC "hum" due to a ground loop.
-
- Global Positioning System: see GPS.
-
- GMRS
- Acronym: General Mobile Radio Service
- Communications: A land-based mobile radio service established by the FCC
to be licensed to persons for short-distance two-way communications
between the licensee and his/her immediate family members. Each
licensee manages a system consisting of one or more stations.
-
- GMT
- Acronym: Greenwich Mean Time or Greenwich Meridian Time
- Measurement:
The standard by which all world time is set. This was done at the 1884
International Convention at Washington DC, USA, which designated the
Prime Meridian (Zero Longitude) as running through Greenwich.
Additional information is available at GreenwichMeanTime.com.
-
- Gopher
- Internet:
A pre-WorldWideWeb Internet server system that presented the server's
contents as a hierarchal file list. Named for the school mascot at the University of Minnesota, where it was developed. See Archie, Jughead and Veronica.
-
- GPRS
- Acronym: General Packet Radio Service
- Telephony: An extension to the GSM standard to include packet data services.
-
- GPS
- Acronym: Global Positioning Satellite, or Global Positioning System
- GPS: Either the global navigation system based on 24 or more satellites
orbiting the earth at an altitude of 12,000 statue miles and providing
very precise, worldwide positioning and navigation information 24 hours
a day, in any weather, or the devices designed to receive and display
this information. The system is also called the NAVSTAR system.
-
- Gradation
- Digital Video: A smooth transition between black and white, one color and another, or color and no color.
-
- Gray Level
- Digital Video: The brightness of a pixel.
-
- Gray Scale
- Digital Video: Refers to an image that contains shades of gray as well as black and white, but no other colors.
-
- Greenwich Mean Time: see GMT
-
- Ground
- DIY, Electronics: A reference point connected to the earth or assumed to be at zero potential with respect to the earth.
-
- Ground Balance:
- Metal Detectors:
A mode of operation in which specialized circuitry can be adjusted to
ignore the masking effect that iron ground minerals have over metal
targets.
-
- Ground Balance - Factory Preset
- Metal Detectors:
A feature that eliminates the manual ground balance control and its
adjustment from the operator's setup procedure. This adjustment is
performed internally by the factory to optimize operation over an
average range of nonconductive soils.
-
- Ground Balance - Manual Adjusted
- Metal Detectors: A feature requiring a manual control adjustment procedure to neutralize the effects of negative minerals in the search matrix.
-
- Ground Balance - Self Adjusting
- Metal Detectors:
A feature that senses change in ground mineral content and continuously
readjusts the ground balance while in operation. Sometimes called Ground Tracking or Automatic Ground Balance.
-
- Ground, Electrical
- Electronics: The common return path for electric current.
-
- Ground Filter
- Metal Detectors: Complex circuitry found in motion-type detectors that separates mineral signals from metal signals, allowing the metal signal to be further processed by the discrimination circuitry.
-
- Ground Fog: see Fog, Ground.
-
- Grounding
- Cables, Communications, Electronics: The connection of an antenna or other cable
(intentionally or accidentally) to the earth in order to provide a safe
path for static discharge or lightning so that it does not feed into
the connected equipment.
-
- Ground Loop
- Electronics, Audio, Video: An unwanted current
that flows in a conductor between two points that are at different
potentials. It usually occurs in a device that is connected to several
AC devices (such as an equalizer or a piece of test equipment),
creating an AC "hum". In video devices, this can appear as a bar
rolling from top to bottom; in audio devices, it appears as an audible
hum. It can be eliminated by connected all audio/video equipment to the
same ground, or by using GLI's (Ground Loop Isolators).
-
- Ground, Mineralized
- Metal Detectors: Any soil that contains conductive or non-conductive components.
-
- Ground, Negative
- Metal Detectors: Soil that contains non-conductive minerals that have a negative or nulling effect on air-tuned threshold.
-
- Ground, Neutral
- Metal Detectors: Non-mineralized soil that lacks non-conductive or conductive mineral properties.
-
- Ground, Positive
- Metal Detectors: Soil that contains conductive minerals or moist salts that have a positive or upward effect on an air-tuned threshold.
-
- Group Call
- Telephony: A call to a group of mobile cellular units, as opposed to a single mobile cellular unit.
-
- GSM
- Acronym: Global System for Mobiles
- Telephony: A TDMA standard with 8 users per channel, GSM is the European digital cellular standard.
-
- Guide Plus+
- Video: A feature on VCR's that provides an on-screen channel guide.
Gust
Weather:
A sudden significant increase in or rapid fluctuations of wind speed.
Peak wind must reach at least 16 knots (18 miles per hour) and the
variation between peaks and lulls is at least 10 knots (11.5 miles per
hour). The duration is usually less twenty seconds. |