User's Manual

THALES COMMUNICATIONS
OIM
AHV1600-SYSTEM
Page 201
July 16/09
INSTALLATION
1. GENERAL CONDITIONS
A. POWER SUPPLY
A nominal voltage of 28 Vdc powers the equipment.
It can nevertheless operate within a DC power supply range of 22 V to 30.3 V.
The absorbed power at 28 V is less than 20 W. It is typically 18 W.
The primary power supply circuit is isolated from the secondary circuit.
B. LOCATION
When selecting a location for equipment and working out the details for installation in the platform,
the objectives should be easy implementation and replacement of the equipment and radar altimeter
as close as possible from the antennae.
C. WATER, SAND, AND DUST TIGHTNESS
Although the equipment is designed to withstand salt spray and a high degree of humidity, it is not
waterproof and precautions should be taken to protect it against trickling or sprayed water (accord-
ing to its specifications).
D. MOUNTING
The AHV1600 Transceiver is fixed on the platform by means of four M6 screws, without any pre-
ferred orientation.
E. INSTALLATION CONDITIONS
The AHV1600 Radar altimeter normal installation conditions are described hereafter:
−
Radio Frequency (RF) isolation between the transmission and reception antennae > 75 dB.
−
Adaptation of each antenna 50 ohms, over the frequency range (4.2 GHz to 4.4 GHz).
−
Gain of each antenna at least 7 dBi and 11 dBi maximum, over the frequency range 4.2 GHz to
4.4 GHz.
− Aperture angles of the antennae are at - 3 dB (with ANT-140A):
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••
•
in pitch ± 25° ± 2.5°.
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••
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in roll ± 30° ± 3.5°.