User's Manual

SBS
-
900 Shore
Ba
Ba
sed
Radar Systems
Chapter
10
10
:
Corrective maintenance
KH
KH
-
1602 2
issue 1
:
Standard SBS900 Systems Operator & Maintenance Handbook
Page
132
of
240
10.3.6
RF rotary joint
The
RF
RF
•Qi
- MfMPPMR?PWH
oint is the mechanism by which the RF
from the wavegu
ide is
coupled to the rotating antenna waveguide.
The joint is secured to the centre of the
swing casting
and connects
to the waveguide on the
underside of the antenna.
Time:
The r
emoval and replacement of the
rotating joint
can take between
4 to
5
hours to
complete depending on accessibility
and availability of lifting equipment
.
There are a number of tasks involved in the removal and replacement of the rotating joint:
a)
a)
Removal of the antenna
b)
b)
Removal of the RF coupling and azimuth encoder from within the
gearbox
housing
c)
c)
Removal and replacement of the rotating joint
d)
d)
Re
Re
-
assembly of the RF coupling and azimuth encoder
e)
e)
Re
Re
-
installation of the antenna
Spares required
Casing colour
Signal white
Casing colour
Silver Grey
Replacement rotating joint
Rotating joint gasket
DTX
-
A183
GTX
-
A1246
DTX
-
A183
64
64
GTX
-
A1246
Antenna removal
See section
10.3.1
for the precautions and instructions on removing the antenna.
RF coupling and encoder removal
Coupling:
Within the gearbox enclosure, disconnect the base of the Ro
-
Jo from the inner
wavegui
de assembly.
Ensure the inner waveguide is suitably supported to prevent any stress on retaining
fasteners.
Encoder:
Prior to removing the rotating joint, it is necessary to remove the azimuth encoder
from the inside of the gearbox housing.
Full details can be found in section
10.3.5
page
130
.