INSTRUCTION BOOK OPERATING INSTRUCTIONS TERMALINE® LOAD RESISTOR SERIES 8400 Electronic Corporation Cleveland (Solon) Ohio USA ©Copyright 1998 by Bird Electronic Corporation Instruction Book Part Number 920-8400S Rev.
Safety Precautions The following are general safety precautions that are not necessarily related to any specific part or procedure and do not necessarily appear elsewhere in this publication. Keep Away From Live Circuits Operating personnel must at all times observe general safety precautions. Do not replace components or make adjustments inside equipment with the high voltage supply turned on. To avoid casualties, always remove power.
Warning Statements The following safety warnings will appear in the text and are repeated here for emphasis. WARNING When power is in the upper range of the load’s capacity, the radiator will become hot - care should be used in touching the equipment. WARNING Do not attempt to disconnect these loads from the coaxial cable while RF energy is still being applied. Leaking RF power is a potential health hazard.
BENUTZUNG WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN, KANN DIE GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN. UTILISATION TOUTE UTILISATION DE CET INSTRUMENT QUI N’EST PAS EXPLICITEMENT PRÉVUE PAR LE FABRICANT PEUT ENDOMMAGER LE DISPOSITIF DE PROTECTION DE L’INSTRUMENT. IMPIEGO QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME SPECIFICATO DAL PRODUTTORE LA PROZIONE DI SICUREZZA POTREBBE VENIRNE COMPROMESSA.
ENTRENTIEN L’EMPLOI DES INSTRUCTIONS D’ENTRETIEN DOIT ÊTRE RÉSERVÉ AU PERSONNEL FORMÉ AUX OPÉRATIONS D’ENTRETIEN. POUR PRÉVENIR UN CHOC ÉLECTRIQUE DANGEREUX, NE PAS EFFECTUER D’ENTRETIEN SI L’ON N’A PAS ÉTÉ QUALIFIÉ POUR CE FAIRE. ASSISTENZA TECNICA LE ISTRUZIONI RELATIVE ALL’ASSISTENZA SONO PREVISTE ESCLUSIVAMENTE PER IL PERSONALE OPPORTUNAMENTE ADDESTRATO. PER EVITARE PERICOLOSE SCOSSE ELETTRICHE NON EFFETTUARRE ALCUNA RIPARAZIONE A MENO CHE QUALIFICATI A FARLA.
About this Manual This instruction book covers the Models 8401, 8402, and 8404 Termaline Load Resistors. This instruction book is arranged so that essential information on safety is contained in the front of the book. Reading the Safety Precaution section before operating the equipment is strongly advised. The remainder of this Instruction Book is divided into chapters and sections.
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Table Of Contents Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . i Warning Statements. . . . . . . . . . . . . . . . . . . . . ii Cautions Statements. . . . . . . . . . . . . . . . . . . . . ii Safety Statements . . . . . . . . . . . . . . . . . . . . . ii About This Manual . . . . . . . . . . . . . . . . . . . . . v Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Purpose and Function. . . . . . . . . . . . . . . . . . . . 1 Description. . . . . . . . . . . . . . . .
Initial Adjustments. . . . . . . . . . . . . . . . . . . . . . 9 Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . 9 Normal Operation. . . . . . . . . . . . . . . . . . . . . . 9 Operating Under Emergency, Adverse, or Abnormal Conditions.. . . 9 Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . 10 Emergency Shutdown. . . . . . . . . . . . . . . . . . . . 10 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . 11 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 Introduction This publication refers to the Termaline Load Resistors Models 8401, 8402, and 8404. The difference between models is listed in the specifications. These models will generally be referred to as a load throughout this manual. Purpose and These loads are portable, general purpose 50 ohm coaxial Function RF transmission line terminations. They are self- contained units requiring no outside power source or additional equipment.
Bird Series 8400S Termaline Coaxial Load Resistor service to perform their function, other than the RF input power. Environmental The load should be operated in an environment as free of Requirements dust and vibration as possible. For proper operation the ambient temperature should remain within the range of -40°C to +45°C (-40°F to +113°F). Allow at least 12 inches (304.8 mm) of clear space around the load to provide an unimpeded flow of convection air currents for adequate heat dissipation.
Introduction Specifications Impedance: VSWR: dc-1000MHz 1000-2800MHz 2800-3000MHz Connectors: Model 8401 Model 8402 50 ohms nominal Model 8404 Same as 8401 plus UG-57G/U N(M) to N(M) adapter and dust cap 600 W continuous Power Range 1.1:1.0 Maximum 1.2:1.0 Maximum 1.3:1.
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Chapter 2 Theory of Operation General The Models 8401, 8402, and 8404 Termaline Load Resis- tors consist essentially of a carbon film-on-ceramic resistor immersed in a dielectric coolant. The resistor, individually selected for its accuracy, is enclosed in a special exponentially tapered housing. This provides a linear reduction in surge impedance directly proportional to the distance along the resistor.
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Chapter 3 Installation Location CAUTION The load is designed for operation in a horizontal plane only, with mounting brackets down. Do not operate in any other position. Install the Termaline Load Resistor in a location that: 1. Has sufficient room to provide at least twelve inches (304.8 mm) of free space around and above the unit. 2. Is the shortest possible distance, or cable length from the transmitting equipment. 3.
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Chapter 4 Operating Instructions Use and Function of Controls Initial Adjustments Because these are passive devices, there are no operating controls on the Load Resistors. Start-up 1. Connect a Male type plug, which mates with the RF input connector, to the load. No initial adjustments are required other than to connect the load to the RF source by means of a coaxial cable equipped with a suitable matching connector plug. 2.
Bird Series 8400S Termaline Coaxial Load Resistor Shutdown Because the loads are passive devices, there is no way to turn them off. Power must be shut off at the source of the RF energy. Emergency Shutdown WARNING Do not attempt to disconnect these loads from the coaxial cable while RF energy is still being applied. Leaking RF power is a potential health hazard. Turn off the RF power at the source.
Chapter 5 Maintenance This chapter contains operator maintenance instructions, troubleshooting, and parts information. Troubleshooting Problem Leakage of coolant oil around band or radiator housing. Possible Cause Clamping band not tight. Faulty O-Ring (front). Faulty diaphragm (rear). Overheating of the radiator. Transmitter power is too high. Coolant level is too low. Faulty RF section. High or low dc resistance values. Faulty RF input connector. Loose RF input connector.
Bird Series 8400S Termaline Coaxial Load Resistor Inspection With the rugged and simple construction of the Load Re- sistors, periodic inspection will be necessary at only about six-month intervals. Inspection should include the items listed below: 1. Oil Leakage - Check for coolant oil seepage around the radiator tank, particularly at the front and back around the underside of the clamping band. 2. Inspect the Load for completeness and general condition of the equipment.
Maintenance Disassembly There are no special techniques required for the repair or replacement of components in the loads. A screwdriver is the only tool needed. RF Connector The connector is a patented “Quick Change” design. Replacement This process does not interfere with the essential coaxial continuity of the load resistor RF input or the coolant oil seal. For replacement, proceed as follows: 1. Remove the four 8-32 x 5/16 inch round head machine screws from the corners of the RF connector. 2.
Bird Series 8400S Termaline Coaxial Load Resistor lowing coolant excess to drip back into the radiator. 4. Inspect the O-Ring seal which is located just inside the mounting flange of the resistor assembly. Do not reuse the O-Ring if it is not soft and pliable or if it shows signs of surface cracks.
Maintenance REPAIRS Any maintenance or service procedure beyond the scope of those provided in this chapter should be referred to a qualified service center. Preparation For Wrap and tape the RF connector to keep out foreign maShipment terial, then pack and brace the load in a suitable con- tainer. A sturdy corrugated paper box is recommended. Storage No special preparations are needed for storage other than to cover the equipment to keep out dust and dirt.
Bird Series 8400S Termaline Coaxial Load Resistor Replacement Parts List Item 1 Qty. 1 Description Radiator assembly Model 8401 & 8404 Model 8402 Part Number 2440-001-1 2440-013 2 1 RF Section assembly 8401-002 3 .7 gal (2.65 liters) Dielectric coolant 5-030-3 (1 gal.
Limited Warranty All products manufactured by Seller are warranted to be free from defects in material and workmanship for a period of one (1) year, unless otherwise specified, from date of shipment and to conform to applicable specifications, drawings, blueprints and/or samples.
