About Marine-ElectronicsABOUT MARINE-ELECTRONICS The progress in marine electronic systems within recent years can only be described as breathtaking. Sail boat systems are now at levels of sophistication similar to those on commercial vessels, in many cases they exceed them. The following cover most systems found on motorboats, as well as relevant selection, installation, maintenance and troubleshooting information. Good planning is essential, in an overall boat context. Reliability depends on good installation and a reliable and stable electrical power system. ABOUT MARINE-ELECTRONICS POWER SUPPLIES The power supply is a fundamental part of any electronics equipment. It is also a common cause of failure or source of interference. Typical power supplies are designed to withstand supply variations of 5-10% over the whole load range and maintain a stable output voltage. The main power supply in use is the filtered and rectified DC supply. These have been replaced in recent years by regulated switch-mode power supplies. They have the advantage of minimal interference, improved performance and costs. ABOUT MARINE ELECTRONICS Cable Routing. Ensure that all radio transmission cables are routed clear of signal cables. Where cable crossovers are required, make sure they are at 90°. Where it is possible space out and secure power, radio and signals cables with the required separation distances. Position electronics equipment so that aerial cables and inputs are exiting the navigation station area directly, without being routed behind other instruments, or close to other cables if at all practicable. Electrical Equipment Location. Where possible do not locate the main electrical switchboard next to the electronics equipment. In most cases this very difficult. There is a trend towards small sub-boards containing circuit breakers for the electronics equipment to be fitted locally. This has the advantage of removing many interference causing electrical equipment from the adjacent area. Accessibility Ensure that easy access can be made to rear connections. In many cases the rear fuse holders in power leads or the equipment casing may require access.
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