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JMA-9172-SA Instruction Manual > 3.BASIC OPERATION > 3.4  GENERAL RADAR OPERATION
3.4 GENERAL RADAR OPERATION
3.4.1 Interference Rejection (IR)
Interference by other radars is rejected.
1) Left-click the  IR  button located at the lower left of the radar 
display.
The interference rejection modes are switched.
   →   →   →   → 
When a high interference rejection level is selected, the radar’s ability of 
detecting small targets such as buoys and small boats lowers.
In general,    should be selected.
Rejection levels of the interference rejector
 IR Off : Interference rejector off/ Stagger trigger off
 IR Low : Interference rejection level - low/ Stagger trigger off
 IR Middle : Interference rejection level - moderate/ Stagger trigger on
 IR High : Interference rejection level - high/ Stagger trigger on
Interference rejector switch link with stagger trigger switch automatically. 
When a high interference rejection level is selected, the radar’s ability of detecting small 
targets such as buoys and small boats lowers. 
In general,  IR Low  should be selected. 
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