Chapter 3: Installation
47
Antenna
(not supplied)
You should use a good quality VHF antenna, designed for marine use installed in
accordance with the following:
• ensure that the antenna is connected to the radio before transmitting.
• Raymarine declares a Maximum Permissible Exposure (MPE) radius of 1.5
meters (per OET Bulletin 65) for this system, assuming 25 watts output to an
omnidirectional antenna of 3dBi gain or less.
• for watercraft with suitable structures, the antenna base must be at least 3.5
meters above the main deck to meet the MPE for persons up to 2 meters tall.
• for watercraft without such structures, the antenna must be mounted so that
its base is a minimum of 1.5 meters vertically from the heads of all persons.
• as high as possible and free from obstruction for maximum range. VHF
transmission is essentially line-of-sight.
• if you have to extend the length of the co-axial cable between the antenna
and the radio, use one that is designed for minimum power loss over the cable
length.
Cables
When planning the installation, consideration should be given to where cables
are to be run:
• Try and avoid acute bends in cables.
• Secure and protect cables from physical damage and protect them
from exposure to heat. Avoid running cable through bilges or door-
ways, or close to moving or hot objects.
• Where a cable passes through an exposed bulkhead or deck head,
a water-tight feed-through should be used.
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