2. FINE TUNING THE SONAR PICTURE

2.5Rejecting Sonar Interference and Noise

While observing the sonar picture, you may encounter occasional or intermittent noise and interference. These are mostly caused by on-board electronic equipment, engine or propeller noise, or electrical noise from other sonars being operated nearby.

2.5.1Identifying noise source

To eliminate noise effectively, you should first identify the noise source.

•Turn off “TRANSMISSION” in the SONAR menu to stop transmission and operate all on board 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 two steps affects on the picture, adjust the INT REJECT (Interference Rejector), NOISE LIMITER or TX CYCLE on the SONAR menu as appropriate.

2.5.2Rejecting noise with the interference rejector

This control is similar to the interference rejector on echo sounders and radars. It is effective for rejecting random noise and sea surface reflections in rough sea conditions. Set the interference rejector so that noise is just eliminated. Do not use an unnecessarily high setting since small wanted echoes may also be rejected.

1.Press the MENU key.

2.Use the [RANGE] control to choose [MENU MODE] at the top of the screen.

3.Use the [GAIN] control to choose SONAR to display the SONAR menu.

4.Use the [RANGE] control to choose INT REJECT.

5.Use the [GAIN] control to set interference rejection level, from 0 (OFF) to 3 (highest degree of suppression).

6.Press the [MENU] key to close the menu.

2.5.3Rejecting noise with the noise limiter

Weak, unwanted reflections, colored light blue or green, are displayed when water is contaminated or plankton layers exist or due to ship’s noise.

1.Press the MENU key. The last-used menu appears.

2.Use the [RANGE] control to choose [MENU MODE] at the top of the screen.

3.Use the [GAIN] control to choose SONAR to display the SONAR menu.

4.Use the [RANGE] control to choose NOISE LIMITER.

5.Use the [GAIN] control to set noise limiter level. The setting range is 0-10 and the higher the figure the greater the degree of suppression.

6.Press the [MENU] key to close the menu.

2-5

Page 32 Page 34
Page 33
Image 33
Furuno CSH-5L/CSH-8L manual Rejecting Sonar Interference and Noise, Identifying noise source
Page 32 Page 34

CSH-5L/CSH-8L specifications

Furuno CSH-5L and CSH-8L are advanced marine radar systems known for their cutting-edge technology and user-friendly interfaces. Designed primarily for maritime applications, these radar units cater to a wide range of vessels, from commercial ships to fishing boats. The primary distinguishing feature of the CSH-5L and CSH-8L radar systems lies in their ability to provide high-resolution images and precise detection of targets, ensuring navigational safety and operational efficiency on the water.

One of the standout technologies incorporated into both models is the pulse compression technique. This feature significantly enhances target resolution and minimizes blind spots, allowing the radar to detect smaller objects at greater distances. With the CSH-5L and CSH-8L's powerful signal processing capabilities, users can expect exceptional performance even in challenging weather conditions, ensuring reliable operation during storms or fog.

The CSH-5L model operates at a frequency range of 5 GHz, while the CSH-8L uses an 8 GHz frequency. Both radars are equipped with a rotating antenna that provides a wide coverage range, allowing for efficient monitoring of the surrounding marine environment. Their high sensitivity and low noise levels enhance target detection, making them particularly useful for locating small fishing vessels or buoys.

Another important characteristic of the Furuno CSH-5L and CSH-8L is their user-friendly interfaces. Both models feature intuitive controls, allowing operators to adjust settings easily and access critical information quickly. The displays are designed for clarity, enabling users to distinguish between targets and navigate effectively.

Additionally, the radar systems include advanced features such as automatic target tracking and target acquisition capabilities. This functionality allows users to monitor multiple targets simultaneously, providing essential situational awareness for safe navigation. The CSH-5L and CSH-8L also support integration with other onboard systems, including ECDIS (Electronic Chart Display and Information System), which enhances the overall effectiveness of maritime navigation.

In summary, the Furuno CSH-5L and CSH-8L radar systems represent the forefront of marine radar technology, offering exceptional detection capabilities, user-friendly controls, and robust integration options. Their advanced features ensure that mariners can navigate confidently, making them a vital asset for anyone operating in the marine environment.
Top Page Image Contents