Koden KGC-222, Руководство по обслуживанию

Страница: 19 / 43

Chapter 1 Installation KGC-222
1-2 0093822202-01
2. GPS antenna: GA-12
To operate the equipment in good order, the following points should be observed for
installation of GPS antenna.
The GPS antenna GA-12 must be installed where good radio wave reception is achieved. No
obstacles should be located above the antenna otherwise the radio wave reception may be
interrupted. This causes the available GPS service hours to be reduced and degrades the
positioning accuracy.
(1) Select a site away from metallic objects, where possible.
(2) Locate the GPS antenna at least 4 m away from radio antennas such as, Inverted-L
antennas for MF/HF transmission, Whip Antennas for VHF or UHF.
(3) Locate the GPS antenna at least 1.5 m above any Inverted-L antenna for MF/HF
transmission.
(4) Locate the GPS antenna at least 1 m from receiving antennas.
(5) Locate the GPS antenna away from radar beams (Vertical beam width: 30
o
to 40
o
).
(6) Locate the GPS antenna at least 1 m away from radar antennas.
(7) Locate the GPS antenna at least 5 m away from Inmarsat radomes.
(8) Locate the GPS antenna at least 3 m away from DF loop antennas.
(9) Locate the GPS antenna at least 2 m away from the ship’s engine.
(10) Locate the GPS antenna at least 0.5 m away from metallic objects.
Should any of the requirements mentioned in item (1) to item (10) not be met, try to fulfill the
requirements of item (10) and install the GPS Antenna as far as possible from the antennas
described in item (1) to item (9). Put the GPS Antenna as trial on a promising site to make
sure that the unit operates as specified before fixing the GPS Antenna position and then fix
the antenna firmly. The GPS Antenna installed in an improper site may result in poor bearing
accuracy and positioning error that may lead to potential hazards.