JRC JMA-5312-6HS Installation Manual page 116

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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