User's Manual

Chapter 2 Radar Basic Operation MDC-5200/5500 Series
0093155002-03 2-42
2.25 Interference rejection (IR)
This feature is used to reject interference from other radars.
Radar transmissions on same frequency band can cause interference noise on the display depending
on its transmitted power. This noise pattern appearance varies case by case, but is usually spiral shape
or like the spokes of a wheel in shape. This function can reduce interference effect.
[IR] can be changed directly at the upper right of the display.
[IR] is also effective to reduce second echo phenomenon.
1 Move the cursor to set value window of [IR] at the upper right part of the display.
Press ENT key repeatedly until desired value appears.
Note:
• The setting value can be selected from “OFF, 1, 2, and 3” and the larger value applies stronger
interference rejection effect.
• Too much removal effect may also remove small targets. Pay attention to that.
2.26 Video contrast
This is a function to change the relation between the strength of returned echo and their display
gradation.
At VID 1, the difference of signals strength between strong echo and weak echo becomes larger. As
the numerical figure becomes larger in VID 2, VID 3, VID 4, and VID 5 the difference in signal strength
becomes smaller.
[VID] can be changed directly at the upper right of the display.
1 Move CURSOR to 1, 2, 3, 4 or 5 of [VID] at the upper right part of the display.
Press ENT key repeatedly until desired value appears.
When the difference of signal strength is small, images becomes sharper.
However, signal strength from small ships and buoys is weak, and the difference between clutter and
them is not large enough.
Therefore, it is necessary to display clutter which may blend together with small ships and buoys.