NorthStar 961 Install Manual

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Contents

NorthStar 961 Install Manual Manual pdf 25 page image

SECTION TWO - Installation961/962 INSTALLATION MANUAL Revision A Page 15The processor connectors are as follows:• power connector (3-wire)• TNC connector (control head #1)• TNC connector (control head #2)• interface connector P1 (18-wire)• interface connector P2 (18-wire)• GPS antenna connector (BNC)• DGPS beacon antenna connector (UHF)• PC connectors (variable)• VGA video out (15-wire)Installing the antennaChoosing anantennaThere are three antenna choices for the 961/962X and 961/962XD:• for reception of GPS-only signals (the standard one-piece “active”AN150 antenna)• for reception of both GPS and DGPS signals (a two-piece antennasystem comprising the standard AN150 GPS antenna and the 8410DGPS coupler)• for reception of both GPS and DGPS signals (optional one-pieceAN205-P “combination” antenna)Choosing anantenna locationChoosing the AN150 antenna locationThe GPS receiving antenna is a vital link between the 961/962’s receiverand the outside world. Aesthetics and easy access should be secondary toproviding strong and reliable GPS signals to the 961/962. You shouldselect a location for the antenna that meets the following requirements:• The antenna should have a reasonably clear view of the horizon, butbe no higher than necessary, since side-to-side motion of theantenna caused by rolling of the vessel may degrade SOG and COGreadings. The antenna should be 12 to 18 inches above thesurrounding surfaces to avoid interference.• The antenna must be out of the radiation path of any on-board radarsets or strong magnetic fields.• The antenna must be lower than any INMARSAT communicationsantenna.• The antenna should be as far as possible from other high-powertransmitting antennas.• Watch out for electromagnetic “shading” of antennas from rigging,other vessels, shoreline buildings, and so on. Secure the cable well.To avoid mutual interference among different antennas on the vessel, seethe illustration of recommended separation distances in “Figure 5:Separation distances between antennas” below. This figure shows the