Simrad NX40 Installation Manual download pdf (Page 18)

16 | Install the radar

3.7 How to reduce false echoes and shadow zones

False echoes can be produced on the radar display if the scanner is installed too close to an

object on the vessel's superstructure. This object can block the radar beam and reflect it back,

generating false echoes and shadow zones.

If you are having problems with false echoes and/or shadow zones, re-install the scanner at a

higher location where the radar beam will be clear of any obstructions.

If this is not possible, try relocating the scanner away from the central keel line of the vessel to

the starboard side. This will move any shadows to the port side, maximize the radar view of

your give way sector, and ensure a clear view of the area around the vessel at the bow.

Use the following formula to calculate the distance that you'll need to move the scanner:

Ls = 0.4R + D/2 (when R is less than 49 ft [15 m])

Ls = 0.025R + D/2 (When R is greater than or equal to 49 ft [15 m])

where:

Ls = distance to be moved from the keel line

D = diameter of the obstacle

R = distance between the antenna and the obstacle

3.8 Install the open array scanner

IMPORTANT: Install the open array onto the scanner ONLY after you've connected the

interconnection cable.

Use the assembly sheet provided and check that you've got all the components shown. Follow

the instructions on the assembly sheet to install the open array.

3.9 Install a scanner on a trestle

Depending on your chosen location for the scanner, it may be easier to install the scanner if you

fabricate a trestle (or radar mast) on which you can mount the scanner.

The trestle must be sturdy and secure, and capable of supporting the scanner in all weather

conditions.

You are recommended to install the base of the trestle parallel to the water surface.

Orient the trestle so that the cable inlet on the scanner will face the stern, and so that the

scanner can be mounted at the correct angle (as discussed in the "Power boat installation"

section).

Make sure that the edges of the trestle won't trap water.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 79 80

No comments

Simrad NX40 Installation Manual Page 18