Icom AT-130 [5/12] Coaxial cable

Содержание

ANTENNA SYSTEM 1 Coaxial cable Insulate the lead in cable of the AT 130 E antenna minal and antenna element from other metal objects To prevent interference keep cables as from an antenna electric pump and equipment ter far as possible other electronic To prevent erroneous indications keep away as possible from the flux gate compass cables Use suitable noise filters for alternators lights etc Ask your Icom Dealer for details as far fluorescent Ground and counterpoise Why ship s ground is required Counterpoise The AT 130 E s ground terminal MUST be connected to your ship s ground Grounding prevents electric shocks interference to other equipment and other problems Grounding also ensures effective signal transmission If your ship is made of FRP etc and a good ship s ground is not available connect a counterpoise DANGER NEVER connect the ground terminal to the following points These connections may cause an explosion or electric shocks Gas or electrical pipe Fuel tank Oil catch pan BE CAREFUL The mounting plate is NOT connected the AT 130 E s internal ground Non through mast is NOT electrically connected to sea water to Ideal ground points One of following points is ideal Ship s ground terminal External ground plate External copper screen Good ground points If electrically connected to sea water one of the following points is usable Stainless steel tuna tower Stainless steel stanchion Through mast Throughhull Metal water tank Undesireable ground points AVOID the following points if possible These connec tions may cause noise or electrolysis Engine block Keel bolt Electrolysis All ground cables from the AT 130 E HF transceiver etc on your ship should be connected to only 1 ship s ground AVOID connection to 2 or more points Voltage differ ences between 2 or more ship s grounds may cause electrolysis AVOID connections between dissimilar metals where an electric current is present These connections may cause electrolysis 1 4 A quater wavelength radial for each band is suit able for a counterpoise Install the counterpoise directly below the AT 130 E s ground terminal Insulate the ends of each radial from other metal objects Layout the radials horizontally and as straight as possible L Counterpoise length for the operating frequency mJ f Operating frequency MHz _300_ _J_ f4 Example At an operating frequency of 16 MHz use a counter poise with the following length L 300 lo 4 1 x 4 7 m 1 m 39 inches Ground cable For the best results use the heaviest gauge wire or metal strap available Make the distance between the AT 130 E s ground terminal and ship s ground as short as possible Supplied ground cable is usable for ground connection to a through mast Confirm that the through mast is electrically connected to sea water