INSTALLATIONS
2-2
② Selecting a position for and installing the antenna
The antenna is a conductor that emits RF energy (radio waves) from the transmitter, and receives
signals from other stations. There are many types of antennas. The most common of which are the
vertical whip antenna (6 meters long) and the wire antenna (10 to 20 meters long). Follow the
recommendations below for both types.
• Install the antenna as far as possible from any structures, wires, or other antennas to reduce any
effect to tuning or radiation patterns. For example, install the antenna 10 meters or more from
loran or omega antennas.
• Use an insulator with sufficient pressure resistance, and do not paint or get sand on it.
• Once the antenna is installed it is a part of the radio equipment and grounding it is considered
very important.
• The antenna's efficiency is proportional to the area of the antenna's ground (RF ground), so large
metal ships result in efficient antennas. Therefore, for smaller non-metal boats, provide sufficient
ground area (normally 30 m
2
or more).
• Connect all antenna grounds to the GND terminal of the antenna tuner.
• Refer to "Examples of antenna installations" in this manual for methods to install antennas.
Examples, particularly for transmitting antennas, of suitable and unsuitable grounds are described
below. In figure (a), the transmitting antenna, antenna tuner, radio, controller, and the user are
included as part of the radiating objective. Not only does this reduce efficiency, it also creates the
risk of electrocuting the user. Figure (b) shows an ideal example, in which the radiating objective
includes the transmitting antenna and the antenna tuner only.
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