B&G Network GPSplus - Manual (Page 65)

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INSTALLATION OF ANTENNA UNIT
CHOOSING A LOCATION
Select a suitable site for the antenna unit with reasonable
consideration of the following points:
• As close as possible to the vessel's deck, which has a
relatively unobstructed view of the horizon
• Avoid areas where the unit could become damaged, e.g.
where ropes or wires could become entangled
• Avoid installing unit at the mast top: this location
accentuates the boat’s motion
• Avoid areas of high vibration, e.g. engine housings and
radar installations
• Not within 60cm (2ft) of other antennas, e.g. VHF, SSB
• Above or below a radar's cone of transmission
• Below and at least 3m (10ft) away from satellite
communications equipment
Dense wood or metal structures will shield the unit from
satellite signals. However, stays, masts and relatively dry
sails will not interfere with reception. The unit can receive
signals through glass, canvas and thin fibreglass (for
example, a wheelhouse or saloon area), however it would
be advisable to try such a location before permanent fixture.
MOUNTING THE ANTENNA UNIT
The GPS antenna unit may be pole mounted. The threaded
socket at the base of the unit will accept a 1¼" straight
thread. The GPS antenna unit only requires hand tightening
on to the pole mount. Over tightening with a tool could
damage the threaded socket at the base of the unit.
The pole mounting arrangement of the GPS antenna unit
makes it easy for you to remove and store it in a safe and
secure place when not in use. For permanent installation it
is advisable to drill and pin the GPS antenna unit. This will
discourage theft and prevent accidental loosening.
Alternatively the GPS antenna can be split into two parts by
removing the four screws in the underside. The lower part
can be discarded, leaving the GPS antenna with a flat base,
which can be mounted on a cabin top or “A” frame.
If you choose this mounting option secure the GPS antenna
from underneath using 4 x M3 machine screws. Care should
be taken to trim overlong screws so no more than 7 turns of
the thread are inside the GPS antenna.