Where Radar antenna be placed / kept onboard?

Display units

The main display units should be sited on the bridge from which the ship is normally navigated. The following are some of the factors that should be borne in mind when selecting the most convenient site for the unit:

  • Compass safe distances.

The permissible separation of the unit from magnetic compasses may dictate the site.

  • Lighting.

The small amount of light issuing from the display unit may be enough to interfere with visual lookout when the bridge is in darkness; and there will be occasions when additional light is needed at the display unit either for comparison of the display with a chart or for running repairs to the unit. Conversely, there may be times when ambient light on the bridge is too strong for effective viewing of the display. Difficulties such as the foregoing may be overcome by the use of display visors.

  • Direction of view.

At least one display unit should be so sited that an observer faces forward when viewing it, and is readily able to maintain a visual lookout.

  • Azimuth stabilization.

Surveyors should check that the display is provided with an input from a heading sensor.

Inspection of waveguide and microwave co-axial cables

Radar feeder runs are constructed from either waveguide or co-axial cable. The following types are in general use:

  1. Rigid waveguide with a rectangular cross section;
  2. Semi-rigid waveguide, usually with an elliptical cross section;
  3. Flexible waveguide, usually with a rectangular cross section; and,
  4. Microwave co-axial cable.
    Flexible waveguide should not be used for long runs as the losses in this type of waveguide are high. However, it can be used in short sections to overcome some of the physical constraints of a rigid or semi-rigid waveguide.
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About the author

Amit Sharma

Graduated from M.E.R.I. Mumbai (Mumbai University), After a brief sailing founded this website with the idea to bring the maritime education online which must be free and available for all at all times and to find basic solutions that are of extreme importance to a seafarer by our innovative ideas.

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