User's Manual

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Mitigation of RF interference
Service degradation due to RF interference can
be signicantly improved by:
• Increasing the distance and moving the
antenna o axis from the source of the
interference, and
• Using an external band pass lter and an
external antenna.
WARNING
Failure to use BEAM approved antenna cables will
result in degraded performance and may damage
the Terra 800. This will void the product warranty.
Cabling
Using an externally mounted antenna provides
an ideal solution for many applications. It is very
important that both the antenna cabling and
antenna are BEAM approved products. Always
ensure all RF connectors are screwed together rmly
and ensure there are no sharp bends in the cabling
between the Terra 800 and the antenna.
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.
Symptoms of RF interference
Symptoms of RF interference often resemble
those that arise when an antenna is being
operated with an obstructed view of the sky.
Some of these symptoms 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 antenna.
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There are conditions that can compromise the
quality of the service you may receive. These include:
• Obstructions
• Cabling
• RF Interference
Obstructions
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.
Inmarsat performance is immune from natural
environments such as clouds, fog, rain, snow,
wind and smoke.