Instruction manual

PROFICIENCY IN SURVIVAL CRAFT AND RESCUE BOATS OTHER THAN
FAST RESCUE BOATS
14 20
are also detected. As the first sweep is a fast one, then the range error is
minimised and should be less than 150 metres.
The timescale over which all this occurs is very short. Each "fast" sweep
takes about 0.4µs, each "slow" sweep about 7.5µs. The complete series of
twelve forward and return sweeps is therefore complete within 100µs.
Displayed on the PPI, the spacing between each pair of dots will be 0.6
nautical miles.
On a long range setting, a typical radar will be triggering the SART every
millisecond - but only during the period that the rotating radar scanner is
pointing in the correct direction. Most modern radars use sophisticated noise
rejection techniques, which prevent the display of echoes which are not
synchronized with the radar's own transmissions, so one radar will not
normally be confused by a SART's response to a neighbouring radar.
The SART indicates that it has been triggered by lighting an indicator
LED continuously (it flashes in standby mode) and by sounding an integral
buzzer. If no radar pulses are detected for a period exceeding 15 seconds,
the SART reverts to "standby" mode.
Fig 14-9 Different types of SARTs
LIFERAFT SART
Supplied with or without mast. Normally is packed as part of the liferaft
equipment.
The mast version is mounted in the same manner as the carry-off
version; the version without the mast is intended to be hung from the highest
point inside the liferaft.
14.3.2 Operating instructions
To switch on:
- Break the security tab away from the body of the SART.
- Rotate the switch ring clockwise (ie to the left) to the ON position
marked by “1”.