User's Manual

SBS
-
900 Shore
Ba
Ba
sed
Radar Systems
Chapter
10
10
:
Corrective maintenan
ce
ce
KH
KH
-
1602 2
issue 1
:
Standard SBS900 Systems Operator & Maintenance Handbook
Page
176
of
240
10.7.12.3
Removal & replacement
Tools:
In addition to the normal tools required for service and maintenance work, the
following tools will be required:
4BA spanner
:
Used for the removal of the waveguide bolts.
The waveguide switch cannot be repaired in the field and contains no
user accessible parts.
Removal:
The waveguide switch is removed as follows:
1.
1.
Fully isolate and disconnect the system from all sources of AC power including any UPS
supported mains.
2.
2.
Disconnect the connector from the
top
of the waveguide switch.
3.
3.
Remove and re
tain all nuts, bolts and washers that retain the switch
in
in
to the
transceiver
enclosure.
All fastenings must be retained as they will be required for refitting.
4.
4.
Once the fastenings are removed the switch can be removed
Waveguide switch on SBS
-
A125
chassis
Waveguide s
witch port identification
:
The ports are identified by numbered labels (1, 2, 3
&4) attached to the main switch.
Port 1:
RF feed for antenna
Port 2:
RF feed for transceiver B
Port 3:
dummy Load
Port 4:
RF feed for transceiver A
Refitting:
To refit the waveguide switch, reverse the above removal process making a carful note of
the port locations on the switch noted above.
RF seal:
Ensure that all RF couples are correctly aligned and tightened. Incorrectly terminated
RF couplings
can lead to RF leakage which can be hazardous to health and cause
system performance issues.
Caution:
When reinstalling the switch take extreme care when fitting and tightening the bolts
into the switch assembly as it is easy to cross thread or break the
bolts.