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
174
of
240
10.7.12
Waveguide switch
Waveguide switch
assembly
The RF outputs of Tx
A and Tx B are connected to the antenna via a waveguide switch
internally
mounted in the centre of the transceiver enclosure.
10.7.12.1
Operation
Power:
The waveguide switch operates from
+28
VDC from
the SBS
-
A126 PCA
. This supply
is available as soon as the transc
e
iver enclosure switches
ON.
Control:
During Local or Remote operation, the waveguide switch is controlled by the Radar
Distribution Unit via the SBS
-
A126 PCA and requires no operator input.
Tx A selected
-
The
Tx
Tx
A select line will be
at +28
VDC
-
When the sw
itch has selected
Tx
Tx
A, the
Tx
Tx
(A) SEL tell back line goes
Hi
confirming that the switchover has been successful.
-
The
Tx
Tx
(B) select and
Tx
Tx
(B) tell back lines are both at zero volts.
Tx B selected
-
The
Tx
Tx
B select line will be
at +28
VDC
-
When the switch has selected
Tx
Tx
B, the
Tx
Tx
(B) SEL tell back line goes
Hi
confirming that the switchover has been successful.
-
The
Tx
Tx
(A) select and
Tx
Tx
(A) tell back lines are both at zero volts.