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2. RADAR OPERATION
2-35
Radar
antenna
Radar
mast
Shadow sector
Funnels, stacks, masts, or derricks in the path of the
antenna block the radar beam. If the angle subtended
at the antenna is more than a few degrees, a
non-detecting sector or blind spot may be produced.
Within this sector, targets can not be detected.
2.27.2 SART (Search and Rescue Transponder)
A Search and Rescue Transponder (SART) may be triggered by any X-Band radar within a
range of approximately 8 nm. Each radar pulse received causes it to transmit a response
which is swept repetitively across the complete radar frequency band.
Radar antenna beamwidth
Screen A: When SART is distant
Screen B: When SART is close
Position of SART
Own ship positionOwn ship position
24 NM
1.5 NM
Position of SART
Echo from SART
Own ship positionOwn ship position
Echo from SART
(Lines of 12 dots
are displayed in
concentric arcs.)
(Lines of 12 dots
are displayed in
concentric arcs.)
Appearance of SART signal on the radar display
General procedure for detecting SART response
1. Use the range scale of 6 or 12 nm as the spacing between the SART responses is
about 0.6 nm (1125 m) to distinguish the SART.
2. Turn off the automatic clutter suppression (if applicable).
3. Turn off the Interference Rejector.