Maintenance Handbook

SBS-800 Series Operator & Planned Maintenance Handbook
Chapter 6: Operation Overview
KH-1601-2 Issue 6
Page 37 of 80
6.4 Transceiver Operational States
The following table shows the various operation states of the X or S-Band SharpEye™ transceivers
within the gearbox/turning unit:
Operation state
Description
OFF
Power is not applied to the transceiver and it is switched OFF.
Initialise
When power is applied to the system, the SharpEye™ initialises and switches
to standby or, if any of the self-test checks fail, to fault state.
The system initialisation typically takes 30 to 40 seconds after which time the
system becomes available for operation. Control settings and transceiver
system parameters saved to the non-volatile memory of the RDU are loaded
into the SharpEye™.
Standby
In standby the transceiver has established communication with the Radar
Distribution Unit and reports its status.
The transceiver receives and acts on commands from the RDU.
In Standby the antenna rotates but the system does not transmit.
Transmit
When a RUN command is received from the Radar Distribution Unit and
azimuth and heading line signals are present, the SharpEye™ transmits.
The transceiver initially outputs at low power. The radar returns are then
processed enabling the VSWR to be checked without the risk of damage to
the transceiver.
If the VSWR is within limits then the transceiver automatically switches to full
power.
If the VSWR is high, indicating an antenna fault, a warning message is sent to
the Radar Distribution Unit and the transceiver enters the degraded Low
Power state.
Degraded
(Low power)
The transceiver continuously runs background performance checks on
forward power, reverse power, receiver sensitivity and temperature. If any of
these parameters falls outside predetermined levels a warning message is
sent to the Radar Distribution Unit indicating the nature of the fault.
The transceiver continues to operate, but with reduced performance and
functionality.
Fault
If the performance or functionality is degraded such that the transceiver
cannot operate it enters the fault state and a fault message is sent to the
display equipment.
The transceiver stops radiating RF and there is no video output to the Radar
Distribution Unit.
A spurious fault may be cleared by re-powering the equipment.
Communication
error
If communication is lost between the Radar Distribution Unit and the
SharpEye™, the RDU reboots the SharpEye™ leading to a potential 60
second gap in coverage.