Yaesu FT-857D Operating Manual

Also see for FT-857 series: Manual Technical supplement Operation manual Brochure & specs Technical supplement

Contents

Yaesu FT-857D Operating Manual Manual pdf 13 page image

11FT-857 Operating ManualBase Station Earth GroundingTypically, the ground connection consists of one or more copper-clad steel rods, driven intothe ground. If multiple ground rods are used, they should be configured in a “V” configura-tion, and bonded together at the apex of the “V” which is nearest the station location. Use aheavy, braided cable (such as the discarded shield from type RG-213 coaxial cable) andstrong cable clamps to secure the braided cables to the ground rods. Be sure to weatherproofthe connections to ensure many years of reliable service. Use the same type of heavy, braidedcable for the connections to the station ground bus (described below).Do not use gas line pipes in an attempt to provide a ground connection! To do so creates aserious risk of explosion!!Inside the station, a common ground bus consisting of a copper pipe of at least 1” (25 mm)diameter should be used. An alternative station ground bus may consist of a wide copperplate (single-sided circuit board material is ideal) secured to the bottom of the operatingdesk. Grounding connections from individual devices such as transceivers, power supplies,and data communications devices 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 theground bus. This so-called “Daisy Chain” grounding technique may nullify any attempt ateffective radio frequency grounding. See the drawings below for examples of proper andimproper ground connections.INSTALLATIONGROUNDINGProper Ground ConnectionLinearAmplifier PowerSupplyTransceiverImproper Ground ConnectionTransceiver LinearAmplifierPowerSupply"Daisy Chain"