5-1
Radar equipment adopt a variety of pulse circuits. Those circuits or inter-unit cables emit higher harmonic
components of the pulse wave as electromagnetic waves, and those components affect the radio communication
equipment's receiving antenna and cables, resulting in receiver noise. The following general procedures are
effective in preventing noise interference:
5.1 SHIELD OF DEVICES
The components on the radar have springs or other fittings attached at spots required for shielding them. This
spring needs to have sufficient electrical contact to prevent each device from emitting noise. Pay careful
attention during installation.
Make sure that screws for the device cover, door, etc. are tightly fastened.
5.2 INTER-UNIT CABLES
Be sure to use designated cable between the units.
Pay careful attention to cable connections and the treating condition of cable ends (especially, shield
meshwork).
5.3 INSTALLATION LOCATION
Although devices have been sufficiently shielded, the shielding of some may not be perfect. For example, the
display unit's LCD panel surface and the processing unit's fuse holder emit a slight amount of noise. Therefore,
do not position receiving equipment's scanner cable near those devices. Furthermore, a shielded cable might
cause noise, so, do not route such a cable in parallel with a scanner cable.
5.4 GROUNDING
Although situations change according to the hull structure and the positional relationships between radio
equipment and radar equipment, the procedures below may not be entirely effective. But, ground each device to
the closest ground location on the hull, and also, ground the concerned radio equipment to the closest ground
location.
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