JRC JMA-3400 Series, Instruction Manual, Page: 96 / 314

Chapter 3 ADJUST THE RADAR ECHO
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3.2 SENSITIVITY ADJUSTMENT (GAIN)
Radar echo sensitivity Radar echo sensitivity Radar echo sensitivity
Low Middle High
It is important to be note that if you adjust the gain level to maximum, the noise might be also displayed on the
screen at the same time.
GAIN set Exceed
If sensitivity is set too high, unnecessary signals such as noises in the
receiver and false echoes increase to lower target visibility. At the same
time, if sensitivity is set too low, detection of targets such as ships and
dangerous objects may be hindered. Therefore, sensitivity must always be
set to an optimal level.
The sensitivity value is displayed at the lower
part of the screen when the GAIN control is
turned left or right.
Turning the control right increases the value,
and turning it left decreases the value.
About the GAIN control : please refer to the number 11 in Chapter 2.2.
In the case of a fine weather, gain level is set close to the maximum
values usually. In the case of a bad weather, such as heavy rain or snow
or rough seas, it is necessary to adjust not only the gain level, but also
the sea clutter suppression function and rain/snow clutter suppression
function. You need to choose an appropriate level, respectively.
It is necessary to set an appropriate gain level in order to use the radar exactly.
Failure to do so, it is possible to obtain an accurate radar echo.
Examples of the radar echo sensitivity as follows.