Yaesu FTDX9000D Operation Manual

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Page 13FTDX9000D OPERATION MANUALI NSTALLATION AND I NTERCONNECTIONSGroundingThe FTdx9000 HF transceiver, like any other HF communications apparatus, requires an effective ground system formaximum electrical safety and best communications effectiveness. A good ground system can contribute to station effi-ciency in a number of ways: It can minimize the possibility of electrical shock to the operator. It can minimize RF currents flowing on the shield of the coaxial cable and the chassis of the transceiver; such currentsmay lead to radiation which can cause interference to home entertainment devices or laboratory test equipment. It can minimize the possibility of erratic transceiver/accessory operation caused by RF feedback and/or improper cur-rent flow through logic devices.An effective earth ground system make take several forms; for a more complete discussion, see an appropriate RF engineer-ing text. The information below is intended only as a guideline.Typically, the ground connection consists of one or more copper-clad steel rods, driven into the ground. If multiple groundrods are used, they should be positioned in a “V” configuration, and bonded together at the apex of the “V” which is nearestthe station location. Use a heavy, braided cable (such as the discarded shield from type RG-213 coaxial cable) and strongcable clamps to secure the braided cable(s) to the ground rods. Be sure to weatherproof the connections to ensure manyyears of reliable service. Use the same type of heavy, braided cable for the connections to the station ground bus (describedbelow).Inside the station, a common ground bus consisting of a copper pipe of at least 25 mm (1”) diameter should be used. Analternative station ground bus may consist of a wide copper plate (single-sided circuit board material is ideal) secured to thebottom of the operating desk. Grounding connections from individual devices such as transceivers, power supplies, anddata communications devices (TNCs, etc.) should be made directly to the ground bus using a heavy, braided cable.Do not make ground connections from one electrical device to another, and thence to the ground bus. This so-called “Daisy-Chain” grounding technique may nullify any attempt at effective radio frequency grounding. See the drawing below forexamples of proper grounding techniques.Inspect the ground system - inside the station as well as outside - on a regular basis so as to ensure maximum performanceand safety.Besides following the above guidelines carefully, note that household or industrial gas lines must never be used in anattempt to establish an electrical ground. Cold water pipes may, in some instances, help in the grounding effort, but gas linesrepresent a significant explosion hazard, and must never be used.