Beam Iridium User manual

Iridium Antenna Guide
Installation and User Manual
BEAM Communications Pty Ltd

IRIDIUM ANTENNA INSTALLATION &USER MANUAL
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Antenna Installation Guide
Antenna installation is critical for optimum performance of your Iridium service.
Your antenna is your connection to the satellites and it needs as clear a line of sight
to the horizon as possible.
Every effort should be made to achieve maximum visibility at all times.
There is a range of antenna options available and your Service Provider will advise
the most appropriate antenna installation for your application.
Installing Antenna Cables
When installing antenna cables, follow these guidelines:
Route and restrain cables to prevent them from vibrating or moving under normal conditions,
which could result in damage to the antenna, BEAM terminal, or the coaxial cable
connections.
Wherever the cables contact structures, protect the cables from chafing or abrasion. If a cable
needs to be bent, avoid kinking it, and ensure that each bend radius follows the cable supplier
limits.
Use coaxial sealant, shrink-wrap tubing, electrical tape, or another suitable product to seal all
cable connections appropriately to prevent moisture and corrosion damage from weather
exposure.
Connectors should be tightened as shown below in the absence of manufacturer advice
specific to your cable:
oTighten Type N connectors to a torque of 0.68 to 1.13 N-m (6 to 10 inch-lbs).
oTighten Type TNC connectors to a torque of 0.45 to 0.68 N-m (4 to 6 inch-lbs).
Use only cables supplied by BEAM for the Iridium network.
Mount all antennas vertically and clear of nearby metal obstructions
Minimize horizontal obstructions as much as possible because they can create areas of poor
system coverage.
To minimize the loss of radio signal from a passive antenna to the terminal, the specific
coaxial cable system between a passive antenna and the other component should be less than
3db including connector loss.
Information furnished by BEAM Communications Pty Ltd (BEAM) is believed to be accurate and reliable. However, no responsibility is assumed by
BEAM for its use, or for any infringement of patents or other rights of third parties, which may result from its use. No license is granted by
implication or otherwise under any patent or patent rights of BEAM. BEAM reserves the right to change specifications at any time without notice.
Copyright © 2012 BEAM Communications Pty Ltd. All rights reserved
Product name: IRIDIUM ANTENNA INSTALLATION & USER MANUAL
Manual revision: 2
Part Number: USRMAN003001
Release date: April 2012

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Installation Options
The antenna system is suitable for marine, vehicle and fixed applications and is designed to meet
Iridium System performance requirements when installed according to the instructions in this
guide.
The following figure shows typical Installations:
Preferred Antenna Location

Vehicle Antenna Installation
The ideal position for any
vehicle-mounted application
is to capitalise on the
greatest ground plane from
the surface of the vehicle.


Marine Antenna
Installation
The antenna must be installed
without obstruction of other
instruments or structures.
The antenna must not be
positioned within range of
radar equipment or other RF
interference.

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Assuring Quality of Iridium Service
Iridium is committed to providing subscribers around the world consistent, reliable, quality voice
and data access all day every day. The Iridium satellite system is monitored for call performance
from numerous locations 24 hours a day, 7 days a week in order to achieve this.
There are conditions that can compromise the quality of the service you may receive. These
include:
Obstructions
Cabling
RF Interference
1. Obstructions
The antenna must be able to “see” the entire sky from approximately 8 degrees above the
horizon. Nearby tall buildings or similar structures, heavily leafed trees and mountains can all
degrade performance as they block the signal between the antenna and the satellites. Having a
completely open view of the sky plays a very important role in maximising performance, as the
Iridium satellites cross the sky from North horizon to South horizon during a connected call.
All surrounding obstructions must be lower than the top of a fist extended at arms length and the
bottom of the fist placed on the horizon. Iridium performance is immune from natural
environments such as clouds, fog, rain, snow, wind and smoke.

IRIDIUM ANTENNA INSTALLATION &USER MANUAL
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2. Cabling
Using an externally mounted antenna provides an ideal solution for many applications. If you
have or plan to install an external antenna, it is very important that the cables used meet the
Iridium guidelines established for proper performance.
For optimal performance, we recommend using the shortest length of cable and the fewest
number of connectors possible.
3. RF Interference
All wireless devices, including satellite telephones, are susceptible to RF (radio frequency)
interference from other electronic devices. This problem is more evident when numerous
antennas and broadcasting devices are located within close proximity to each other.
The location of the INMARSAT antenna in relation to the Iridium antenna plays a significant role in
determining the degree of signal degradation that an Iridium subscriber can expect to experience.
Given the inherent system differences (LEO versus GEO), all Iridium units are susceptible to this
interference, regardless of the type of antenna being used.
Generally speaking, an Iridium unit; either handset or fixed terminal with an external antenna,
located within 15 and 45 meters (50 to 150 feet, respectively) of an operating INMARSAT mini-M
or Standard-C terminal, will likely experience degraded performance.
Other sources of RF interference such as Globalstar units, radar devices and broadcast stations
can provide interference for Iridium units, but usually are not encountered as frequently as
INMARSAT terminals.
Symptoms of RF Interference
Symptoms of RF interference include:
erratic or no signal strength indication,
dropped calls or warbled or otherwise distorted voice.
These symptoms may be intermittent or persistent, depending largely on the interference source,
its distance, strength and frequency relative to the Iridium unit.
Mitigation of RF Interference
Degradation of service due to RF interference to the Iridium unit can be significantly improved by:
a) Increasing the distance and moving the Iridium antenna off-axis from the source of the
interference (therefore: to the side or behind the INMARSAT antenna, above or below it),
b) Using an external band pass filter and an external antenna.

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Co-operation with Inmarsat:
Inmarsat Mini-M
Recommended Distance Between an Iridium Unit and an Active Inmarsat Mini-M Terminal
Antenna
• Main Lobe = directly in front and in line with
the Inmarsat terminal antenna:
225 feet (68 meters)
• Side Lobe = directly to the side and in line with
the Inmarsat terminal antenna:
100 feet (30 meters)
• Rear Lobe = directly to the rear and in line with
the Inmarsat terminal antenna:
50 feet (15 meters)
Inmarsat M-4
Recommended Distance Between an Iridium Unit and an Active Inmarsat M-4 Terminal Antenna
•Main Lobe = directly in front and in line with the
Inmarsat terminal antenna:
715 feet (217 meters)
•Side Lobe = directly to the side and in line with the
Inmarsat terminal antenna:
100 feet (30 meters)
•Rear Lobe = directly to the rear and in line with the
Inmarsat terminal antenna:
250 feet (76 meters)
Inmarsat-C (CAPSAT)
Recommended Distance Between an Iridium Unit and an Active Inmarsat-C (CAPSAT) Terminal
Antenna.
•Main Lobe = directly in front and in line with the
Inmarsat terminal antenna:
150 feet (45 meters)
•Side Lobe = directly to the side and in line with the
Inmarsat terminal antenna:
150 feet (45 meters)
•Rear Lobe = directly to the rear and in line with the
Inmarsat terminal antenna:
150 feet (45 meters)

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Sample Installations
All these Antenna installations provide the best possible view to the horizon –therefore
optimising the Iridium system by providing the best connection with the satellites.
To optimise Iridium performance ALL possible obstructions need to be removed between
the top of the antenna and the horizon
Lightning Protection
Antennas mounted in fixed installations can be exposed to lightning strikes.
As complete protection is difficult, BEAM recommends incorporating specialized lightning
arrestor/surge suppression components into the antenna system to provide this protection.
Install this suppressor at either of the following locations:
Nearest the point at which the coaxial cable enters a building structure
Where the cable first passes close to a grounded structure
Follow manufacturer installation instructions and if you are uncertain about any aspect of your
installations seek assistance from a professional antenna installer.
For more information about BEAM Satellite products visit us @ www.beamcommunications.com