User's Manual

SBS-900 Shore Based Radar Systems
Chapter 5: Technical overview
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 27 of 240
5.10 Transceiver enclosure
The DTX-A7 is a range of external mounted
waterproof enclosures that contains the relevant X or
S-Band SharpEye
TM
transceiver(s), an azimuth signal
interface, system power supplies, a waveguide switch
(where required) and an RF connection to the antenna
sub-assembly.
The system is designed to be externally mounted and
is convection cooled by the use of heatsinks and four
wind turned rotary ventilators mounted on top of the
assembly.
For areas operating in high ambient temperatures
additional powered cooling fans can be fitted as an
option (SBS
-
A179).
Example of a DTX-A7-3 shown with access doors
removed for clarity
Connection to antenna
The system is connected to the antenna sub-system via a bespoke waveguide connected to the top of
the system. The waveguide/ flexwell is supplied preassembled with a static desiccator drying unit (55-
100-0436-001).
Turning data (ACP/ ARP) is interfaced to the enclosure from the turning unit via cable connections.
NOTICE: Maximum flexwell/ waveguide distance
The maximum flexwell/ waveguide run between the DTX-A7 transceiver enclosure and the
antenna sub-assembly is 5 metres.
Waveguide dryer: A static desiccator is supplied pre-assembled onto the
waveguide as part of all SBS-900 systems.
The unit is a totally passive device and requires no electrical power.
It connects directly into a gas inlet port that forms part of the flexwell/ waveguide
assembly.
The clear wall of the unit allows visual inspection of the desiccant condition. As
moisture is adsorbed the colour will change from deep blue to pink/white. When
80% of the desiccant material has changed
colour, the unit should be replaced
.
A pressurised waveguide dryer (SBS-A131-1) is also available as an option.