NorthStar GM1708 961X Installation Manual

Also see for 961X: Reference manual Operation and reference manual

NorthStar GM1708 961X Installation Manual Manual pdf 35 page image

SECTION TWO - Installation961 INSTALLATION MANUAL Revision A Page 25The 8410 ACU has a separate black ground wire inside the coupler base,this wire should be connected to an electrically quiet ground location.This wire is the AC signal ground connection from the antenna input cir-cuit. The purpose of bringing it out is to make available a separate signalground path. Use #16 AWG minimum for grounding. If possible, use agrounding “strap” that is designed for this purpose.Other electrical equipment onboard can cause large amounts of electricalnoise, even at points that appear well-grounded. Try several groundpoints (ground plate, vessel ground, engine block, and so on) to deter-mine which works best under different conditions.Differential GPS antenna cable connectorsBoth ends of the differential beacon receiver antenna cable end in UHFconnectors. To prepare UHF connectors, follow the assembly instructionsin Figure 17. For best results, coat these connectors with silicone dielec-tric grease (DC 4 or equivalent) to protect the connector junction againstwater intrusion and surface corrosion of the contacts.In addition, the connector area including the shield-to-connector junc-tion and jacket-to-crimp ferrule area can be protected with liquid electri-cal tape (Starbright Liquid Tape comes in color-coordinating black orwhite), or self-vulcanizing electrical tape (Tommy Tape).WARNING!Whenever any antenna is disconnected from on-board equip-ment, be sure to ground the antenna shield in order to dis-charge extremely large static voltages that can quickly build upon an ungrounded antenna system. These voltages are haz-ardous to personnel and equipment!