Produktkatalog 2020-ED2

Glossary
MEO The most common use for satellites in this region is
for navigation, communication, and geodetic/space environment
science. The most common altitude is approximately
20,2 km, which yields an orbital period of 12 hours,
as used, for example, by the Global Positioning System
(GPS). Other satellites in medium Earth orbit include
Glonass (with an altitude of 19,1 km and Galileo (with an
altitude of 23,222 km) constellations. Communications
satellites that cover the North and South Pole are also put
in MEO.
Optical wavelength The wavelength (frequency) of the
light used in our fiber products, we use ITU standardized
wavelengths. ITU International Telecommunications
Union. Worldwide standardizing organ for telecommunications.
P1dB Also named “oP1dB”. This means the output 1dB
compression point of an amplifier.
Phase Noise Value of phase noise is a factor that is very
important regarding reception of DVB-S2X and also low
symbol rate transponders.
PLL Phase Lock Loop. Are used for improved frequency
stability of a Local Oscillator.
ppb Parts Per Billion.
ppm Parts Per Million.
Quadlink A Quadlink system include a Fiber Transmitter
and a Fiber Receiver. It transmits and receives all signals
using only one fiber cable.
Quattro LNB Output frequencies are divided in to 4 RF
outputs. Low band Vertical polarisation, Low band Horizontal
polarisation, High band Vertical polarisation, High
band Horizontal polarisation.
Reference High stability/low noise oscillator. Used for
control of PLL LO in a LNB or BDC. It can be oscillator
internal or supplied externally depending on the application.
Common frequency is 10MHz. When used with a
high stability externally reference, extreme high LNB LO
stability can be achieved, down to ±30 ppb (parts per
billion).
SMW Swedish Microwave AB. A professional manufacturer
of microwave solutions.
SNG Satellite News Gathering. Electronic news-gathering
can involve anything from a lone reporter taking a single
professional video camera out to shoot a story, to an entire
television crew taking a production or satellite truck
on-location to conduct a live news report for an outside
newscast. The vehicle on which the electronic equipment
is fitted is called DSNG (Digital Satellite News Gathering).
SOTM Satcom On The Move, or Satellite communications
On The Move, is a phrase used in the context of mobile
satellite technology, specifically relation to military
ground vehicles. The basic principle behind Satcom On
The Move is that a vehicle equipped with a satellite antenna
is able to establish communication with a satellite
and maintain that communication while the vehicle is
moving. The orbital periods of MEO satellites range is
from about 2 to nearly 24 hours
Sun outage A Sun outage, Sun transit or Sun fade is an
interruption in or distortion of geostationary satellite signals
caused by interference (noise) from solar radiation.
The effect is due to the Sun’s radiation overwhelming the
satellite signal.
Symbol rate The Symbol rate variates for different
satellite transmissions and are most often within a range
of 1 to 45 M/Symbols.
TLT Test Loop Translator. A test loop translator is a type
of radio frequency converter or heterodyne, used to
translate between uplink and downlink segments (generally
in the same band), to allow for ”loop-back” testing
and calibration of a satellite ground station without the
need to interface with the satellite. The test loop translator
is an extremely valuable tool for evaluating the
performance of satellite earth stations. It allows the user
to carry out analysis, alignment and testing without incurring
satellite airtime costs and the risk of interfering with
other satellite users.
Uplink band Transmit frequencies to satellite. Products
for different uplink frequency bands are available. Ask for
more information.
VSAT Very small aperture terminal (VSAT) is a two-way
satellite ground station with a dish antenna that is smaller
than 3 meters. The majority of VSAT antennas range from
75 cm to 1.2 m. Data rates range from 4 kbit/s up to 16
Mbit/s. VSATs. are used to transmit narrowband data
VSATs. are also used for transportable, on-the-move (utilising
phased array antennas) or mobile maritime communications.
VSWR Voltage Standing Wave Ratio. Used for measurement
of RF impedance matching.
WDFL Wideband Dual Fiber output LNB.
WDL Wideband Dual output LNB.
X-band Input frequency range normally 7.25-7.75 GHz,
Uplinks and earth observation downlinks shares band 7.75
– 8.5 GHz.
65