8
Nera F77
Continuing the Saturn tradition
HOLE
DIA 22 MM
LONGITUDINAL
AXIS OF SHIP
10 MM STEEL PLATE
ANTENNA
UNIT
ACCESS
HATCH
MAST
FLANGE
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, approximately 65 kgs. 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 1.080 m high and has a maxi-
mum diameter of 1.312 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 inter-
fere with the hatch at the bottom of the antenna unit. The holes
through the mast flange must be positioned symmetrically
about the ship’s longitudinal axis.
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 necessary 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.
Summary of Contents for F77
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