WorldPhone Liberator – Chapter 5. Appendices
B-4
Appendix B – Installation of
Marine Antenna
Location
Avoid obstructions
The Antenna ideally requires a free line of sight in all directions above
an elevation angle of 5 degrees.
Any obstruction will cause blind sectors, and may result in degrada-
tion or even loss of communication with the satellite.
Degrading of the communication is only completely avoided by placing
the antenna higher than any obstructions. This is often not feasible and
a compromise must be made to reduce the number of blind sectors.
The degree of communication degradation depends on the size of the
obstructions; the distance to them must therefore be considered.
Preferably, all obstructions within 3 m of the antenna should be
avoided. Obstructions less than 15 cm in diameter can be ignored
beyond this distance.
Installation of Antenna Unit on top of mast must be avoided.
Compass safe distance
For installation on Norwegian or British vessels, the Antenna Unit
should be located at a distance of at least 1.0 metre from the mag-
netic steering compass. Be aware that requirements may vary from
one country to another.
Radiation precautions
Persons should not be near the
antenna when transmitting for
periods of more than 1 hour per
day.
Avoid interference
The Antenna Unit should be
separated as far as possible
from other communication and
navigation antennas onboard
such as Radar, Satellite, HF/VHF/UHF, GPS antennas etc..
Preferably by at least 5 metres.
The Antenna Unit should be installed so that severe vibration and
shock are avoided. If installed on top of a pipe or signal/radar mast,
the mast must be supported by stays.
The equipment is supplied with gasket and a flange for mounting of
the Antenna Unit on top of a 42.4 mm outer diameter pipe.
Other installation bracket is optional.
MICROWAVE RADIATION !
NO ADMITTANCE WITHIN 1 M
Installation of Marine Antenna
Installation of
Marine Antenna
