Iridium Pilot Installation Manual page 17

Offset Distances from other Communications & Navigation Equipment ADE Location Priorities
X-band (~ 3 cm / 1-GHz) and C-band (4-8GHz) radars
Radar Power
0 – 10kW
30kW
50kW
Important
A vertical separation of at least 15° is required from any RADAR to ensure the ADE is out of the main transmit
beam. If this is violated there is the potential the RADAR pulse will damage the sensitive RF receivers in the ADE
or at a minimum disrupting communications each time the RADAR sweeps past the ADE.
Important! A vertical separation of 15˚ is always required from any radar.
1. Locate the RADARs. They are usually the highest mounted items on the antenna bridge. Look for locations
that are at least 15° below the RADARs and honor the separation distances.
2. Locate Inmarsat radomes and honor the 10 meter separation distances. The Inmarsat and Iridium operating
frequencies are close together and interference is likely if the equipment is too close to each other. Note
there are frequently several satellite communication systems on each vessel. If one system is designated a
"backup" then there may be some latitude to violate the offset distance.
3. Locate the GPS antenna. GPS and Iridium frequencies are close together and transmission from the ADE can
affect ship's navigation if the offset distances are not honored.
4. Note metal (RF reflective) surfaces just below the potential ADE location (Figure 7). Any metal in this area has
the potential to reflect RF energy and cause multipath fading.
5. Look at possible locations and the remaining antennae in the immediate area and select the locations with
the fewest potential interferers.
6. Finally look at the obstructions and determine if the site will provide a reasonably unobstructed view of the
sky. Try not to allow any single obstruction to attenuate signal path more than 2 dB.
6.2 Choosing a Location for the BDE
An ideal location for the BDE should be:
1. Within 50m of the antenna.
2. In a dry location.
3. Within close proximity to the digital and analog interface.
4. Close to AC/DC power.
Shock Hazard
The Below Decks Equipment (BDE) contains low voltage that may cause serious injury if opened
or not grounded. Ensure the unit is properly grounded before operation and after installation do
not, under any conditions, open or dismantle the BDE. Failure to follow these instructions could
result in serious injury or death.
12
Iridium Pilot™ Installation Guide
Min distance at 15˚ vertical separation
0.8 m (2.6 ft.)
2.4 m (7.9 ft.)
4.0 m (13.1 ft.)
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Min distance at 60˚ vertical separation
0.4 m (1.3 ft.)
1.2 m (3.9 ft.)
2.0 m (6.6 ft.)
WARNING