Chapter 3 TRUE AND FALSE ECHOES ON DISPLAY
3.4 FALSE ECHOES
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INSTRUCTION MANUAL
length is SP1 (on the repetition frequency of 2250 Hz), a false echo may appear at a
position that is about 36 NM shorter than the actual distance.
This type of false echo can be discriminated by changing over the range scale (the
repetition frequency), because the distance of the target changes accordingly.
If second time echo is appeared, the use of Economy mode in PRF menu is effective.
Otherwise, Stagger Trigger menu set to on. (Refer to Section "4.6 SCANNER" of
INSTALLATION MANUAL.)
3.4.6 RADAR INTERFERENCE
When another radar equipment using the same frequency band as that on own ship 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.(See Fig. 3.4-4.)
Fig. 3.4-4
If radar equipment causing an interference pattern and this radar 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, the interference patterns cannot be eliminated by using only the interference
reflector function, so press the [TX/PRF] key several times to fine-tune the transmitting
repetition frequency.
An interference suppressing effect can be heightened by applying a different transmitting
repetition frequency to the interference pattern source radar and this radar.
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