Nera Saturn BM Marine, Installation Manual

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8
Installation Manual
Saturn Bm
PLANNING
Saturn B
HOLE
DIA 22 MM
LONGITUDINAL
AXIS OF SHIP
10 MM STEEL PLATE
ANTENNA
UNIT
ACCESS
HATCH
MAST
FLANGE
HEADING
MARK
330MM 247.5MM
350 MM
247.5MM
330 MM
Antenna Unit mounted on mast
Designing the Antenna mast
The mast must be designed to carry the weight of the antenna unit, approxi-
mately 90 kg. It must be able to withstand wind forces of up to 120 knots on
the radome as well as the onboard vibration levels. The radome is 1.445 m
high and has a maximum diameter of 1.42 m.
The top end of the mast should be fitted with a flange with holes matching the
bolts extending from the bottom of the radome. See figure below. The flange
must not be so large as to interfere with the hatch at the bottom of the an-
tenna unit. The holes through the mast flange must be positioned symmetri-
cally about the ship’s longitudinal axis.
A HEADING mark on the radome indicates the forward direction of the
antenna.
NOTE: If necessary to disalign heading mark, (because of hatch accessibility),
the antenna inside the radome has to be aligned towards ship's heading. This
must be done before fixed to the antenna mast. (Pedestal coax outlet = Ped-
estal heading mark. (See Installation: "
Connecting up Above Decks Equip-
ment ").
NOTE: On ships with excessive vibration the mast must be supported by stays
or other adequate means.
If the height of the mast makes it neces-
sary to climb up to the antenna unit, a
ladder must be provided on the mast
column. A guard rail must be attached to
the upper section for safety purposes. If the
height of the mast exceeds approximately
4.5 metres, an access platform should be
attached to the mast approximately 1 metre
below the radome bottom.
Be aware that requirements may vary from
one country to another.