- Generally increase the brilliance until the rotating trace becomes visible. Then gradually decrease the brilliance until the rotating trace just disappears. The brilliance has now been set correctly and should not normally require readjustment if and when the three other critical adjustment controls – Gain, Anti clutter & Differentiator (anti rain clutter) are all off or at minimum.
- If a brilliance control is provided separately for the beading marker, turn it down. Unnecessary brightness of the heading marker will
- cause the heading marker to be broader than necessary.
- Distract the observer’s attention from targets when the picture is obtained later.
- This control will not, and must not blank out the heading marker completely however how the control may be set.
- Ensure that the electronic centre coincides with the geometric centre of the display. This can be done b switching on the range rings and verifying that the outermost ring is completely visible and coincides with the circumference of the PPI. If not centered properly, part of that range ring would not be visible. If necessary centre the picture by rotating the centre shift as required.
- Check that the heading marker is properly aligned. When gyro- stabilised, it should indicate the correct gyro course. When unstabilised, it should coincide with the zero of the bearing scale, if not again it as per manufactures instructions, usually a spring loaded knob is to be pulled out (or pushed in) rotated as necessary, and then released.
- Gradually increase to gain until the receiver noise is just visible as a speckled background. The setting of gain would have to be reduced when suing short range scales.
- Test the efficiency of the set, as described later this chapter.
- Adjust other controls as necessary.
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.