Furuno VR-7000S Installation Manual page 16

1. MOUNTING
• Select a place where interference from other radio equipment is minimal.
The float-free DRU is compliant with IEC 60945. However, some radio equipment
(ex. S-band radar antennas) may create excessive electrical fields, which are larger
than the IEC 60945 test standards. These large electrical fields can interrupt the ra-
dio communication between the storage module and docking module or result in the
malfunction of the equipment. To avoid interference from other equipment, keep to
the following guidelines:
• Select a place where the float-free DRU is not exposed to the RF signal from the
S-band radar antennas.
Generally, a place where the radar antenna is not with in the visual field of the
float-free DRU (ex. wing opposite to the radar mast) is recommended.
• Locate the unit 5 m or more away from a VHF antenna.
The float-free DRU is designed to resist electrical fields of 100 V/m in the VHF
frequency range 156 to 165 MHz. In other frequency ranges between 150 kHz to
2 GHz, the float-free DRU resists electrical fields of 10 V/m. Generally, a VHF an-
tenna creates an electrical field of 10 V/m at distance of 3 meters in the antenna
lobe. Therefore, it is recommended to locate the unit 5 m or more away from a
VHF antenna.
The following picture indicates the recommended and not recommended installa-
tion location.
Outside wall of the
bridge deck where
the radar antenna
is not within the
visual field is
recommended.
Recommended installation location
• Outdoor cables for float-free DRU and junction box should be short as possible. If
long outdoor cables are required, prepare a steel pipe and run the cable through the
pipe to protect the cables from interfering with other radio equipment.
• Before securing the float-free DRU, run a ping test at the planned installation loca-
tion, to confirm that the float-free DRU is subject to interference from other equip-
ment. For the ping test procedure, see the following procedure.
Ping test
Before securing the float-free DRU, do as follows to run the ping test. The ping test is
required to check that the float-free DRU is not subject to interference from other
equipment.
1. Set the IP address and subnet mask of the PC as follows:
• IP address: 10.0.0.101
1-8
The radar antenna
Float-free DRU
is within the visual
field of the float-free
DRU. Therefore, the
float-free DRU may
be affected by the
radar antenna.
Not recommended installation location
(The float-free DRU is subject to radar antenna interference.)
• Subnet mask: 255.0.0.0