Smiths Kelvin Hughes Nucleus 3 5000 Series, System Handbook

Page: 140 / 510

May 01 4b.2 Original
KH 2020
Chap 4b
IN STAL LA TION OF UPMAST X-BAND
TRANS CEIVER CAE-A12-20 (25KW)
GEN ERAL
13
The Upmast Transceiver comprises a casting with two
cover plates. Both cover plates are secured by four
bolts and may be removed to access the motor and
transceiver PCBs mounted within. The PCBs are secured to
mounting plates which form a safety cage whilst in the closed
position.
FITTING
14 The Upmast Transceiver should be installed in such a
position to avoid any RF interference and where Blind
Arcs, caused by obstructions, e.g. masts, funnels, etc, are
eliminated or minimised. Funnels, crosstrees and other large
obstructions can also reflect energy and give rise to spurious
echo returns, especially in close proximity to land.
15 The Upmast Transceiver must not be mounted where
the temperature exceeds 70
o
C.
16 The Upmast Transceiver must be kept clear of ship’s
flexible communication antennas to avoid damage to
both.
17
The Upmast Transceiver must be mounted more than
914mm above any flat surface, when the flat surface is
greater than the diameter swept by the antenna.
18
The Upmast Transceiver must not be positioned in the
close proximity of any magnetic compass or D/F
antenna, etc.
NOTE:
A heavy duty earthing strap or cable must be taken from the
upmast transceiver/turning mechanism to the ship’s earth.
19
Position the Upmast Transceiver at the installation
site, supporting the unit where necessary, and mark
out the mounting holes for drilling. Refer to Figure 1b for
dimensions.
20 Allow sufficient cable length, (approximately 1m) on all
cables to enable them to be routed through the
Transceiver unit. Refer to Figures 2b and 4b for details.
Ensure that there is sufficient slack on all cables to allow for
full movement of the equipment on its mounts during any
sudden shock, or extreme movement of the vessel.
WARNING
THE UNIT MUST NOT BE LIFTED BY MEANS OF THE
ANTENNA OR WING CASTING. THE LIFTING
SUPPORTS MUST GO UNDER THE CASTING.