Manual Standard Horizon Eclipse DSC - GX1150 (page 10 of 80) (English)

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GX1150Page 10

8 GETTING STARTED

8.1 ABOUT VHF RADIO

The radio frequencies used in the VHF marine band lie between 156 and 158

MHz with some shore stations available between 161 and 163 MHz. The ma-

rine VHF band provides communications over distances that are essentially

“line of sight” (VHF signals do not travel well through objects such as buildings,

hills or trees). Actual transmission range depends much more on antenna type,

gain and height than on the power output of the transmitter. On a fixed mount

25W radio transmission expected distances can be greater than 15 miles.

8.2 SELECTING AN ANTENNA

Marine antennas are made to radiate signals equally in all horizontal direc-

tions, but not straight up. The objective of a marine antenna is to enhance the

signal toward the horizon. The degree to which this is accomplished is called

the antenna’s gain. It is measured in decibels (dB) and is one of the major

factors in choosing an antenna. In terms of effective radiated power (ERP),

antennas are rated on the basis of how much gain they have over a theoretical

antenna with zero gain. A 3 foot, 3dB gain antenna represents twice as much

gain over the imaginary antenna.

Typically a 3 foot 3dB gain stainless steel whip is used on a sailboat mast. The

longer 8 foot 6dB fiberglass whip is primarily used on power boats that require

the additional gain.

3dB

6dB

9dB

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Standard Horizon Eclipse DSC - GX1150 Manual

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