Standard Horizon Matrix GX2200 handleiding

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Standard Horizon

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Handleiding

Page7GX2200

5 GETTING STARTED

5.1 PROHIBITED COMMUNICATIONS

TheFCCprohibitsthefollowingcommunications:

• Falsedistressoremergencymessages:

• Messagesto“anyboat”exceptinemergenciesandradiotests;

• Messagestoorfromavesselonland;

• Transmissionwhileonland;

• Obscene,indecent,orprofanelanguage(potentialneof$10,000).

5.2 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

marineVHFbandprovidescommunicationsoverdistancesthatareessen-

tially“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xedmount25Wradiotransmissionexpecteddistancescanbegreater

than 15 miles, for a portable 5W radio transmission the expected distance

canbegreaterthan5milesin“lineofsight”.

5.3 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berglasswhipisprimarilyusedonpowerboatsthat

requiretheadditionalgain.

3dB

6dB

9dB

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