JRC JMA-1030 Series, Instruction Manual, Page: 83 / 198

Chapter 3 ADJUST THE RADAR ECHO
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FOR REFERENCE
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In order to obtain an accurate radar echo, sea clutter suppression adjustment and gain
adjustment are essential.
RAIN:
Normally is set to “0”. But in the case of rain or snow, you need use the rain clutter
suppression function to remove the noise appearing on the screen.
GAIN: Adjust the GAIN to increase receiving sensitivity, then the radar observation range can
be extended. If the sensitivity is set too high, the receiver noise is increase, and the contrast
between the targets and the background video is reduced. As a result, the targets become
obscure on the radar display. To observe densely crowded targets or short-range targets,
adjust the GAIN to reduce the sensitivity so that the targets are easy to observe. However, be
careful not to overlook important small targets.
SEA: SEA clutter suppression function can suppress the near range clutter noise. If the
suitable adjustment is done, you can observe a clear target from short range to long range.
When the automatic mode is selected for the rain/snow clutter suppression function, the sea
clutter suppression function is switched to the manual mode. The sea clutter suppression
function (AUTO) and the rain/snow suppression function (AUTO) cannot be selected at the
same time. In addition, Please adjust the video in function (MANUAL) usually. Please attempt
the function (AUTO) when the video adjustment of short-range cannot adjust by the bad
weather.
< ACTUAL OPERATION >
Set RAIN clutter suppression level to 0.
(1) Set RANGE to more than 6NM, and determine the target in the distance. The target
location is far, and the targets as far possible can barely display is preferable. Set GAIN in
order to observe the target clearly.
(2) Change RANGE to 0.5NM, and set SEA clutter suppression level to observe the near
target clearly. If you reduce the GAIN at this time, the target that was able to display at (1) will
be not able to display, please note on the relation between the long range.
(3) Since the rain/snow clutter suppression function also has the effect of suppressing sea
clutter, the suppression efficiency improves when using with the [SEA] control. In general,
RAIN clutter suppression level is set to “0”. But if you encounter a bad weather, set RAIN
clutter suppression level to achieve better observation state.