INSTRUCTION BOOK OPERATING INSTRUCTIONS TERMALINE® COAXIAL LOAD RESISTOR MODELS 8201 & 8203 Electronic Corporation Cleveland (Solon) Ohio USA ©Copyright 1998 by Bird Electronic Corporation Instruction Book Part Number 920-8201/03 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.
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 QU A LOR A QU E ST O ST R U M E N T O V E N ISSE U T ILIZ ZA T O IN M ODO DIV E R SO DA C OM E SPECIFICATO DAL PRODUTTORE LA PROZIONE DI SICUREZZA POTREBBE VENIRNE COMPROMESSA. SERVICE SERVICING INSTRUCTIONS ARE FOR USE BY SERVICE - TRAINED PERSONNEL ONLY.
Bird Models 8201 & 8203 Termaline Coaxial Load Resistor ASSISTENZA TECNICA LE ISTRUZIONI RELATIVE ALL’ASSISTENZA SONO PREVISTE ESCLUSIVAMENTE PER IL PERSONALE OPPORTUNAMENTE ADDESTRATO. PER EVITARE P E R IC OL OSE SC OSSE E L E T T R IC HE N ON EFFETTUARRE ALCUNA RIPARAZIONE A MENO CHE QUALIFICATI A FARLA.
About this Manual This instruction book covers the Models 8201 and 8203 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 8201 and 8203. The differences between the models are listed in the specifications. Both models will generally be referred to as a load throughout this manual. Purpose and Function These loads are portable, general purpose 50 ohm coaxial transmission line terminations. They are self-contained units requiring no outside power source or additional equipment.
Bird Models 8201 & 8203 Termaline Coaxial Load Resistor maximum VSWR rating is 1.1 to 1.0 over this frequency range. + Note: The specifications for the Model 8203 ap- ply only as long as the ambient temperature remains at 30°C (+86°F) or lower. Dimensions and Weight The Models 8201 and 8203 are 16-13/16 inches L x 5-15/16 inches W x 8-1/2 inches H (427 x 151 x 216 mm). They have a net weight of 20.4 lb (9.2 kg) and a shipping weight of approximately 26 lb (12 kg).
Introduction Specifications Impedance 50 ohms nominal VSWR: Model 8201: 1000-2500 MHz Model 8203: dc-1000 MHz 1.1:1.0 Maximum 1.25:1.
Bird Models 8201 & 8203 Termaline Coaxial Load Resistor Figure 1 Model 8201 ELECTRONIC 4240-062 4
Chapter 2 Theory of Operation General The Models 8201 and 8203 Termaline Load Resistor 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 Model 8201 or 8203 Termaline Load Resistor in a location that: s Has sufficient room to provide at least six inches of free space around and above the unit. s Is the shortest possible distance, or cable length from the transmitting equipment.
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Chapter 4 Operating Instructions Use and Function of Controls Initial Adjustments Start-up Because these are passive devices, there are no operating controls on the Models 8201 and 8203 Load Resistors. 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. 1. Connect a Male N type plug, which mates with the RF input connector, to the load. 2.
Bird Models 8201 & 8203 Termaline Coaxial Load Resistor Shutdown Because both the Models 8201 and 8203 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 Models 8201 & 8203 Termaline Coaxial Load Resistor Inspection With the rugged and simple construction of the Models 8201 and 8203 Load Resistors, 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 Models 8201 and 8203 loads. A screwdriver is the only tool needed. RF Connector Replacement The connector is a patented “Quick Change” design which permits easy interchange with the use of only a screwdriver. 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.
Bird Models 8201 & 8203 Termaline Coaxial Load Resistor 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. Assembly RF Connector Before pushing the RF connector in, be sure that the projecting center contact pin on the connector is carefully engaged and properly seated in the mating socket of the load resistor input.
Storage No special preparations are needed for storage other than to cover the equipment to keep out dust and dirt. Store the unit in a clean dry environment where the ambient temperature will remain within the approximate working range of the instrument -40°C to +45°C (-40°F to +113°F) for Model 8201 and -40°C to +30°C (-40°F to +86°F) for Model 8203. Customer Service Sales /Repair Facilities U.S.A Sales and Manufacturing Service Group Bird Electronic Corporation 30303 Aurora Rd Cleveland (Solon).
Replacement Parts List Models 8201/03 Item 1 2 3 Qty. 1 1 .7 gal (2.
Maintenance 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.
