Technical Manual

SRT X-BAND RADAR SYSTEMS
DESCRIPTION AND MAIN CHARACTERISTICS
304202P003 1.10 Rev. C
1.3.2.4 Pedestal for Downmast Configuration
In the case of a Downmast Configuration the Pedestal contains only the Motor
Unit as described in 1.2.2.3. and one interface PCB.
The link between the rotary joint and the external waveguide is made with a
special 90° joint (Figure 9.1.34/45 – 2) with a flange choke at one of the
extremities.
In this way a mechanically locked connection is not needed and the transceiver
lid can be easily opened.
The microwave signals are connected from the Downmast RF unit by a flexible
waveguide. The pedestal casting has an separate opening for the flexible
waveguide to enter (Chapter 9, Figure 9.1.33. Downmast pedestal Dimensional
Drawing).
The mechanical assembly is mounted similarly to Up- mast configuration,
according to Figure 9.1.34.
The whole assembled SRT pedestal with open top is shown in Figure 9.1.35.
The interface PCB (Figure 9.1.34/45 - 1) functions are:
- Bearing signal conditioning with a +15V high level in output
- Antenna soft –start circuit and rotation protection via the external safety
switch.
- Coaxial cable interface for the Performance Monitor Arm signal.
- Terminal board for the Multicore cable.
The Multicore cable is connected trough a cable gland to the interface PCB and
the brushless motor controller during the installation. The cable gland is not only
IP protected but has an optional ring tenure for EMC.