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2. SONAR MODE
2-9
2.8
Rejecting Sonar Interference and Noise
While observing the sonar picture, you may encounter occasional or intermittent noise
and interference as shown below. These are mostly caused by onboard electronic
equipment, engine, propeller noise, or electrical noise from other sonars being oper-
ated nearby.
Identifying noise source
To eliminate noise effectively, you should first identify the source of noise as follows:
• Operate all onboard equipment one by one while observing the picture.
• Run the boat at various speeds to check if the noise is speed dependent.
If neither of the above affects the picture, turn on “IR“ in the SONAR menu or adjust
NL control as below.
Rejecting noise with the interference rejector
This control is effective in rejecting random noise and sea surface reflections in rough
sea conditions. Pull the GAIN control and adjust it to eliminate only noise. Reject the
noise with “IR” in the SONAR menu. Do not use an unnecessarily high setting since it
many also reject small wanted echoes.
Rejecting noise with NL control
Weak, unwanted reflections, colored light blue or green, appear when water is con-
taminated, or plankton layers or noise exist. These echoes gradually become bluish
as the NL control is turned clockwise. Usually a setting from 3 to 4 provides sufficient
reduction.
Rejecting interference with Tx rate
When other sonars are operating nearby at the same transmission interval as that of
own ship’s sonar, interference caused by other sonars appears. To reduce the inter-
ference, reduce the Tx rate setting on the SONAR menu.
Note:
When the sonar is used in shallow water with the range set between 100 m and
200 m and the Tx rate at 10, bottom reflections caused by the transmission which is
the last but one appear on near on screen. Reduce the Tx rate to 7 or 8 to reject them.
Содержание CH-37BB
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