Connection To A Plotter - Weatherdock Easy TRX2S serie Handbuch

The used GPS antenna has to be a passive one (i.e. it should
incorporate a LNA) and has to be suitable for marine shipboard
applications (index of protection, ruggedness, means of mounting,
etc.). An antenna should be selected with a gain (in dB) depending on
the length of cable between the antenna and the AIS unit; after
subtraction of cable and connector losses a minimum total gain of 20
dB should be available at the easyTRX2S unit GPS antenna connector.
The reason for this is that a proper and flawless GPS signal is required
for a correct function of the easyTRX2S Transceiver product line. (Issue
time-slot method; see „What is AIS".
The GPS antenna to be used for the easyTRX2S Transceiver must be a
dedicated antenna, i.e. not shared with any other GPS receiver.
If you are equipped with a GPS antenna, e.g. for your plotter, there
might be the possibility to use both devices with this antenna. At first
connect the GPS antenna to the easyTRX2S device. When your plotter
is able to receive and process GPS data from an external source you
may establish the connection to your plotter with the green and white
cable (pos. 7+8).
If you chart plotter is not suitable you need both devices and a GPS
antenna respectively.
Rules for mounting of the GPS Antenna
• The GPS antenna should be mounted in an elevated position and
free of shadow effect from the ship's superstructure (i.e. in free
view to the receiving satellite signals)
• The position of the GPS antenna should provide a free view
through 360° with a vertical angle of 5° to 90° above the horizon
• The GPS signals are very sensitive to irradiation of radar, Inmarsat,
iridium, etc. transmitters and should be placed as far away as
possible.

19.4 Connection to a plotter

If you want to operate the easyTRX2S Transceiver with a chart plotter
please connect the devices with your plotter.
Weatherdock AG Sigmundstraße 180
Tel.: +49 911 376638 30
D-90431 Nürnberg
www.weatherdock.de
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