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Chapter 4 Above Deck Unit (ADU) Install
The antenna unit (ADU) is composed of the antenna element, high-power and low-
noise amplifier systems, and a mechanical tracking system housed in the radome.
The ADU is a SpaceCom HN221 2-axis antenna intended for vehicular use.
Connection to the ADU is made by a TNC connector. The single coaxial cable carries
L-band RX and TX, power, and control information.
Physical dimensions
Figure 3-1. ADU – Land Mobile Antenna
Antenna cable lengths
and types
The BDU has an automatic cable calibration feature that determines the loss of the
cable. The RF cable that comes standard in the terminal kit is 6 meters long. If a
different cable is required for the installation, the end-to-end RF loss needs to be 10dB
+0dB/-8dB at 1.6GHz and the cable must be 50 Ohm impedance.
Note: The installer is responsible for choosing the proper type of cable for the length
required in order to meet the loss requirement.
Antenna Installation
When the Thuraya IP Voyager terminal is powered up - avoid exposure to
microwave radiation. Keep a minimum safe distance of 1 meter (39 inches) to the
side and above the antenna.
• ADU:
Size: 252mm x 119mm
Weight: 2kg
• The Antenna - Above Deck Unit (ADU)
17
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