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
138
of
240
10.5.5
RF rotary joint
The
RF
RF
•Qi
- MfMPPMR?PWH
oint is the mechanism by which t
he RF
from
the transceiver waveguide is
coupled to the rotating antenna waveguide.
The joint is secured to the centre of the cast
ing 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
.
Example of rotating joint with
yellow transit caps fitted
There are a number of tasks involved in the removal and replacement
of the rotating joint:
f)
f)
Removal of the antenna
g)
g)
Removal of the RF coupling and azimuth encoder from within the transceiver housing
h)
h)
Removal and replacement of the rotating joint
i)
i)
Re
Re
-
assembly of the RF coupling and azimuth encoder
j)
j)
Re
Re
-
installation of the anten
na
na
Spares required
Casing colour
Signal white
Casing colour
Silver Grey
Replacement rotating joint
GTX
-
A150
2
-
S
Note
Note
GTX
-
A150
2
-
BAAA
S
Note
Note
Note:
The R
otating joint
is delivered in kit form
containing
the ro
-
jo, a
replacement
gasket and coupling bullet.
Antenna removal
See section
10.2.4
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
waveguide 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.