4WM-4 Marine Weather & Audio Receiver Installation Manual
General Information
EMC Installation Guidelines
Simrad, Lowrance, and B&G equipment and
accessories conform to the appropriate
Electromagnetic Compatibility (EMC) regulations,
to minimize electromagnetic interference between
equipment and minimize the effect such interference
could have on the performance of your system.
Correct installation is required to ensure that EMC
performance is not compromised.
For optimum EMC performance we recommend that
wherever possible:
• Simrad, Lowrance, and B&G equipment and
cables connected to it are:
- At least 1 m (3 ft) 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 2 m (7 ft) 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 product is supplied from a separate
battery from that used for engine start. This is
important to prevent erratic behavior and data
loss which can occur if the engine start does
not have a separate battery.
• Simrad, Lowrance, and B&G specified cables
are used.
• Cables are not cut or extended, unless doing
so is detailed in the installation manual.
Note: Where constraints on the installation prevent
any of the above recommendations, always ensure
the maximum possible separation between different
items of electrical equipment, to provide the best
conditions for EMC performance throughout the
installation.
Water Ingress
Water ingress disclaimer:
Although the waterproof rating capacity of this
product meets the IPX6 & IPX7 standard, water
intrusion and subsequent equipment failure may
occur if the product is subjected to commercial
high-pressure washing. Simrad, Lowrance, and B&G
will not warrant products subjected to high-pressure
washing.
Suppression Ferrites
Simrad, Lowrance, and B&G cables may be fitted
with suppression ferrites. These are important
for correct EMC performance. If a ferrite has to
be removed for any purpose (e.g. installation or
maintenance), it must be replaced in the original
position before the product is used.
