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SBS-900 Shore Based Radar Systems
Chapter 5: Technical overview
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 28 of 240
Connection to Radar Distribution Unit
Data Signals: The following signals are transferred between the DTX-A7 enclosure and the Radar
Distribution Unit:
' Digital signals in the form of radar video, display sync, ACP and ARP
' System control, status and BITE data
' Blanking signals
Connections between the two units are via:
' SBS-900-1, -2, -3 & -4: Fibre optic cable
' SBS-900-51: Cable connection
Power: The enclosure is AC powered and controlled by the Radar Distribution Unit. In single
transceivers a single AC supply is provided, in dual systems two AC supplies are
provided (one for each transceiver).
Internal AC-DC power supplies provide all the internal DC power requirements of the
enclosure. A DC supply is also provided to power the ACP/ ARP encoder in the
antenna sub-system.
- For Standard systems sub-systems the encoder supply is +15VDC
- For Advanced antenna sub- systems the encoder supply is +5VDC
Over current protection devices: The Transceiver enclosure is fitted with internal breakers for the
AC supply(s) to the enclosure.
- MCB1 isolates the AC supply to the left hand side of the enclosure.
- MCB2 isolates the right hand side of the enclosure.
All breakers must be in their OFF position before commencing any form of service or
maintenance work on the system.
Access: Access to the unit is via two lockable (8mm hex key), waterproof doors mounted on
the front of the unit.
Location: The DTX-A7-X waterproof enclosure is designed to be externally mounted located
within 5 metres of the gearbox/ antenna turning unit.
Interlocks: Maintenance and ENCOM safety switches are provided via an Antenna Rotation
keyswitch fitted on the RDU and an externally mounted Man Aloft switch
Breakers for the AC input are located within the transceiver enclosure.
If no azimuth (rotation) is detected, the SharpEye will automatically switch to standby
within 60 seconds of signal loss.