10
Digital Radome Scanner - User Guide
Power cables
Digital Radome radar systems are intended for use on boat’s DC power
systems operating in the range 12 to 24 V DC. The Digital Radome scanners
should not be used on nominal 32 V systems.
If you are replacing an existing (Analog) Radome scanner with a Digital
Radome scanner, you must replace the existing cable with a digital cable,
as described on page 9.
Power requirements
This radar is NOT recommended for use on ‘positive’ ground
boats. The power cable earth screen must be connected to
the boat’s ground.
The boat’s power system should be either:
• Negative grounded, with the negative battery terminal connected to
the boat’s ground, or,
• Floating with neither battery terminal connected to the boat’s ground.
The following diagram shows the cable’s power and ground connections:
Fuse requirements
The power connection to the Digital Radome scanner should be made at
either the output of the battery isolator switch, or at a DC power distribu-
tion panel. The power connection must be protected by a thermal circuit
breaker or fuse, fitted close to the power source. The following table
details the fuse requirements for both 18” and 24” Digital Radomes:
WARNING: If there is not a thermal circuit breaker or fuse in
your power circuit (for example, fitted to your DC distribu-
tion panel), you must fit an inline breaker or fuse to the
positive (red) connection of the power cable.
Grounding the radar system
It is important that an effective radio frequency (RF) ground is connected to
the radar system.
You must ground the radar by connecting the drain wire (screen) of the
power cable to the nearest ground point of your boat’s RF ground system.
Full details can be found in the Owner’s Handbook for your multi-function
display unit.
If you need to extend the wire, the extension wire should be an 8 mm braid
or 6 mm
2
(AWG 10) multi-strand cable.
If your vessel does not have an RF system, connect the drain wire to the
negative battery terminal.
Note:
Use only this ground connection.
Red - Bve (12/24 V)
Black - Battery -ve (0 V)
Ground
D8865_1
Table 2-1: Fuse requirements
Power supply
Device
Rating
12 V
Isolator Switch
20 A
Thermal Breaker
10 A
Fuse
15 A
24 V
Isolator Switch
15 A
Thermal Breaker
5 A
Fuse
8 A
