Icom GM800 Instruction Manual - Page 85

9 CONNECTIONS AND INSTALLATION ■ Ground connection The transceiver and antenna tuner must have an adequate RF ground connection. Otherwise, the efficiency of the transceiver and antenna tuner may be reduced. Also, electrolysis, electrical shocks and interference from other equipment may occur. For the best results, use a 50 or 75 mm wide copper strap, and make the connection as short as possible. Ground the transceiver and antenna tuner to one ground point, otherwise the voltage difference (at the RF level) between the 2 ground points may cause electrolysis. RWARNING! When grounding to a metal hull Use Zinc anodes to protect the hull from electrolysis. Ask your dealer or installer for RF grounding details. CAUTION: • NEVER connect the transceiver to a "positive-grounded ship," otherwise the transceiver will not function. • Any external units, such as PC, printer and so on, must be properly grounded. We suggest using a wide copper strap. Ground system example Best ground points • External ground plate • Copper screen • Copper foil Acceptable ground points • Stainless steel stanchion • Through mast • Through hull • Metal water tank Undesirable ground points • Engine block • Ship's DC battery ground Unusable ground points (these connections may cause an explosion or electrical shock) • Gas or electrical pipe • Fuel tank or oil catch pan Wide Copper strap GND GND 9 Copper pipe Metal object ■ Software maintenance The Icom customer support center provides the firmware file for transceiver maintenance. You can update the transceiver's firmware through a PC. Copper screen OPC-478UC To a USB port To the [MAINTENANCE] connector Remote controller PC To the [MAIN UNIT] connector To the main unit Remote control cable 80