Raytheon HSB L755, Owner'S Handbook Manual

Page: 33 / 224

Chapter 2: Installation 2-3
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Planning the Installation
Before you install your system, plan the installation, considering:
• Location of the transducer and display unit, as described in Section 2.3
• Cable Runs, including cables for an integrated system (to provide heading
and position data etc.), as described in Section 2.4.
EMC Installation Guidelines
All Raytheon equipment and accessories are designed to the best industry
standards for use in the recreational marine environment.
Their design and manufacture conforms to the appropriate Electromagnetic
Compatibility (EMC) standards, but correct installation is required to ensure
that performance is not compromised. Although every effort has been taken to
ensure that they will perform under all conditions, it is important to understand
what factors could affect the operation of the product.
The guidelines given here describe the conditions for optimum EMC
performance, but it is recognized that it may not be possible to meet all of these
conditions in all situations. To ensure the best possible conditions for EMC
performance within the constraints imposed by any location, always ensure
the maximum separation possible between different items of electrical
equipment.
For optimum EMC performance, it is recommended that wherever possible:
• Raytheon equipment and cables connected to it are:
• At least 3 ft (1 m) from any equipment transmitting or cables carrying
radio signals e.g. VHF radios, cables and antennas. In the case of SSB
radios, the distance should be increased to 7 ft (2 m).
• More than 7 ft (2 m) from the path of a radar beam. A radar beam can
normally be assumed to spread 20 degrees above and below the radiat-
ing element.
• The equipment is supplied from a separate battery from that used for
engine start. Voltage drops below 10 V, and starter motor transients, can
cause the equipment to reset. This will not damage the equipment, but may
cause the loss of some information and may change the operating mode.
• Raytheon specified cables are used. Cutting and rejoining these cables can
compromise EMC performance and must be avoided unless doing so is
detailed in the installation manual.
• If a suppression ferrite is attached to a cable, this ferrite should not be
removed. If the ferrite needs to be removed during installation it must be
reassembled in the same position.