Wavecom EasySatSystem (W61PC) V1.2.00 - Manual (Page 7)

WAVECOM EasySat System Software V1.2 User Manual Software
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3
 A down converter
 One or more W61PC card(s) with W61SAT options
 One or more card hosts
These components are connected with coax cable. If more than one W61 is to be fed from the same
source, a splitter must be used to correctly match the input impedance of the W61 70-MHz input (input
IF70#4, Zo = 50 Ohm).
Antenna/LNA
The antenna system must have a figure of merit G/T > 0 dB/K. This can be easily achieved with a parabol-
ic dish with a diameter of at least 2 m and a low noise amplifier with a noise figure smaller than 0.8 dB.
The polarization of the L-Band signal is RHCP (Right-Hand Circular polarization), so if a parabolic reflector
is used, the feed must pick up the mirrored left-hand (LHCP) component.
Tracking of the satellite for this diameter of the dish is not necessary, and if so desired the antenna can be
of a fixed type, which is installed and aligned to the satellite only once.
The power of Inmarsat spot beams allow antennas for terminals to be quite small, but for monitoring pur-
poses larger antennas are required in order to also capture neighboring spot beams.
WAVECOM recommends a dish of at least 2.4 m diameter.
Down converter
The down converter is a commercially available product, converting L-band to 70 MHz IF with a bandwidth
of +/- 20 MHz.
Required SNR before decoder: >15 dB (20 dB recommended)
PC(s) with W61PC(s)
These are state of the art computers, running under Microsoft XP, Vista, Windows 7 or Server 2008 with
the same number of PCI slots as the number of W61 cards to be installed.
We recommend 4 cards/PC if cooling and power supply are appropriate.
Proven Components
Check our application note “AN-INMARSAT Setup”.
Software
Installation
During the installation of the „EasySatSystem‟ application by means of the setup utility provided, the di-
rectory into which the application is installed can be specified. In the text of this document the directory
will be called <easysatsystem_dir>.
The following files exist in <easysatsystem_dir>:
 EasySatSystem.exe (the executable)
 XMLRCICPP.dll (a required DLL)
 EasySATSystemUserManual.pdf (this document)
 FileHandler.exe (a program solely needed during the installation of „EasySatSystem‟)
 WAVECOM_Decoder.chm (the help file)
Administrator privileges are required to modify the contents of the <easysatsystem_dir> directory
The configuration file of the application is stored in a subdirectory to <easysatsystem_config_dir>, e.g.
C:\Documents and Settings\All Users\Documents\WAVECOM \EasySATSystem\Config. This directory con-
tains these files: