Raytheon RayChart 620, Operation Manual, Page: 95 / 121

82 RayChart 620
EMC Installation Guidelines
All Raytheon equipment and accessories are designed to the best
industry standards for use in the leisure marine environment.
Their design and manufacture conforms to the appropriate
Electromagnetic Compatibility (EMC) standards, but good 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.
To avoid the risk of operating problems, all Raytheon equipment and
cables connected to it should be:
• At least 3 feet (1m) 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 7ft (2m).
• More than 7ft (2m) from the path of a radar beam. A radar beam can
normally be assumed to spread 20 degrees above and below the
radiating element.
• The equipment should be supplied from a different battery than the
one used for engine start. Voltage drops below 10v in the power
supply to our products can cause the equipment to reset. This will
not damage the equipment, but will cause the loss of some
information and can change the operating mode.
• Genuine Raytheon cables should be used at all times. Cutting and
rejoining these cables can compromise EMC performance and so
should be avoided unless doing so is detailed in this handbook.
• If a suppression ferrite is attached to a cable, this ferrite should not be
removed. If the ferrite has to be removed during installation it must be
reassembled in the same position.
The following illustration shows the range of suppression ferrites fitted
to Raytheon equipment.