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-3.6-
A/C RAIN control
This should be used normally (i.e. to break up areas of rain) when trying to detect a SART response
which, being a series of dots, is not affected by the action of the anti-clutter rain circuitry. Note that
RACON responses, which are often in the form of a long flash, will be affected by the use of this
control.
Some sets have automatic/manual anti-clutter rain control facilities in which case the operator is
advised to use manual control initially until the SART has been detected. The effect of the auto sea
control on the SART response can then be compared with manual control.
This information is excerpted from IMO SN/Circ 197 OPERATION OF MARINE RADAR FOR SART
DETECTION.
3.4 RACON (Radar Beacon)
A RACON is a radar beacon which emits pulses in the radar frequency spectrum (X or S band).
There are several signal formats; in general, the RACON signal appears on the radar screen as a
rectangular echo originating at a point just beyond the position of the radar beacon. It has a Morse
coded pattern. Sometimes, the echo may appear solid, sometimes separated, depending on the
code and radar range scale in use.
Racon