Section 7 True and False Echoes on Display  7-12 
 
7.4.6  Radar interference 
When another radar equipment using the same frequency band is near own ship, a radar interference 
pattern may appear on the radar display. This interference pattern consists of a number of spots which 
appear in various forms. In many cases, these spots do not always appear at the same places, so that 
they can be discriminated from the target echoes. 
 
 
 
If radar equipment causing an interference pattern and this equipment are of the same model, their 
transmitting repetition frequency is nearly the same.  As a result, interference patterns may be 
displayed concentrically. 
In this case, since the interference patterns cannot be rejected by using only the interference rejection 
function, fine-tune the transmitting repetition frequency. (Refer to "18.6 Setting up Radar Antennas") 
By applying different transmitting  repetition frequencies, the interference  rejection effect can be 
improved.