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Summary of Contents for BIRD Termaline Series
- Page 1 Termaline® Load Resistor Series 8755/8756 Operation Manual ©Copyright 2016 by Bird Technologies, Inc. Instruction Book Part Number 920-8755/56 Rev. D ® Termaline is a Registered Trademark of Bird Electronic Corporation...
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Page 2: Safety Precautions
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. These precautions must be thoroughly understood and apply to all phases of operation and maintenance. WARNING Keep Away From Live Circuits Operating Personnel must at all times observe general safety precautions. -
Page 3: Safety Symbols
Safety Precautions Safety Symbols WARNING Warning notes call attention to a procedure, which if not correctly performed, could result in personal injury. CAUTION Caution notes call attention to a procedure, which if not correctly performed, could result in damage to the instrument. Note: Calls attention to supplemental information. -
Page 4: Caution Statements
Termaline® Load Resistor Caution Statements The following equipment cautions appear in the text and are repeated here for emphasis. CAUTION The water flow must be kept in the proper direction; incorrect flow will cause almost immediate burnout. See page 5. CAUTION Do not apply more than rated RF power to the load. -
Page 5: Safety Statements
Safety Precautions Safety Statements USAGE ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY THE MANUFACTURER MAY IMPAIR THE INSTRUMENT’S SAFETY PROTECTION. EL USO DE ESTE INSTRUMENTO DE MANERA NO ESPECIFICADA POR EL FABRICANTE, PUEDE ANULAR LA PROTECCIÓN DE SEGURIDAD DEL INSTRUMENTO. BENUTZUNG WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET ALS VOM HERSTELLER BESCHRIEBEN, KANN DIE GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN. - Page 6 Termaline® Load Resistor SERVICE SERVICING INSTRUCTIONS ARE FOR USE BY SERVICE - TRAINED PERSONNEL ONLY. TO AVOID DANGEROUS ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING UNLESS QUALIFIED TO DO SERVICIO LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVO DEL PERSONAL DE SERVICIO CAPACITADO.
- Page 7 Safety Precautions CONNECT INTERLOCK TO TRANSMITTER BEFORE OPERATING. BRANCHER LE VERROUILLAGE À L'ÉMETTEUR AVANT EMPLOI. CONECTE EL INTERBLOQUEO AL TRANSMISOR ANTES DE LA OPERACION. VOR INBETRIEBNAHME VERRIEGELUNG AM SENDER ANSCHLIESSEN. PRIMA DI METTERE IN FUNZIONE L'APPARECCHIO, COLLEGARE IL DISPOSITIVO DI BLOCCO AL TRASMETTITORE.
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Page 8: About This Manual
Termaline® Load Resistor About This Manual This manual covers the operating and maintenance instructions for the following models 8755 8756 Changes to this Manual We have made every effort to ensure this manual is accurate. If you discover any errors, or if you have suggestions for improving this manual, please send your comments to our Solon, Ohio factory. -
Page 9: Table Of Contents
Table of Contents Safety Precautions ..............i Safety Symbols . - Page 10 Termaline® Load Resistor Repair ..................11 Replacing a Resistive Element .
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Page 11: Chapter 1 Introduction
"Maintenance" on page 9 applicable. Direct Power Measurement When used in conjunction with a Bird Model 6810 Series Thruline Wattmeter or 3127 Series Panel Meters, these RF load resistors may be used for direct reading power measurements up to 30 kilowatts. -
Page 12: Chapter 2 Theory Of Operation
Chapter 2 Theory of Operation General The Termaline Coaxial Load Resistor utilizes an external water supply for the direct cooling of the resistor element. By using this technique, the need for an intermediate dielectric fluid to transfer the heat generated in the resistor element has been eliminated, reducing the physical size of the load to a virtual minimum. - Page 13 Theory of Operation The water flow switch, attached to the water inlet of the load, is factory calibrated to open the electrical contacts whenever the water flow drops below seven gallons per minute and close when the water flow exceeds this value. When the water flow switch contacts open, the time delay relay switch is deactivated, which in turn, opens the interlock switch causing immediate shutdown of the transmitter or other signal source.
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Page 14: Chapter 3 Installation
Chapter 3 Installation General The compact design of the Termaline Load Resistor enables it to be installed in very small spaces. It requires no ventilation and may be placed in any orientation. Do not install where it will be subjected to severe vibration or physical shock. -
Page 15: Water Line Attachment
Be certain the water flow through the switch is in the correct direction. Connect with a 1/2 inch NPT nipple and a 1/2 to 3/4 inch bushing, Bird P/N 5-489-1 and 5-490-1, or connect by hose or pipes. In either case, the flow switch should not be over 20 feet from the load. -
Page 16: Preoperational Checkout
Termaline® Load Resistor Preoperational Checkout Note: Before attempting to operate the RF load, whether under test or actual operating conditions, TEST the complete water system and INTERLOCK CONTROL as follows: 1. Ensure the AC and transmitter interlock power are OFF. 2. -
Page 17: Chapter 4 Operating Instructions
Chapter 4 Operating Instructions General The Termaline RF Load is not equipped with any operating controls, therefore, operators don’t need to be present when in use. Proper operation of the equipment is assured if the instructions contained in "Installation" on page 4 are followed exactly. -
Page 18: Operating As An Rf Wattmeter
Operating as an RF Wattmeter The RF load can be combined with a Bird Rigid Line Series Thruline Wattmeter to form an absorption-type wattmeter by inserting the wattmeter line section just ahead of the RF load. Installation and operation of the wattmeter is covered in the Thruline Wattmeter operation manual. -
Page 19: Chapter 5 Maintenance
Chapter 5 Maintenance General WARNING Never attempt to disconnect RF equipment from the transmission line while RF power is being supplied. Leaking RF energy is a potential health hazard. The Model 8755/56 Termaline Coaxial Load Resistors are rugged units of simple design, requiring only nominal and routine attention. -
Page 20: Rf Assembly Resistance Test
Termaline® Load Resistor RF Assembly Resistance Test Note: These tests are by no means a necessity to the operation of the load but merely guidelines for the users information. Accurate measurement of the DC resistance between the inner and outer conductors of the RF input connector will provide a good check of the condition of the load resistor. -
Page 21: Troubleshooting
Maintenance Troubleshooting For corrections requiring repair or replacement of components, refer to the appropriate section for your specific model. Problem Possible Cause Correction Transmitter shuts off or Low or no water flow Increase cooling water flow. will not stay on. Faulty Flow Switch Perform "Preoperational... -
Page 22: Inspecting The Unit
Termaline® Load Resistor The resistor cap assembly [11] is fitted tightly within the water chamber and should normally remain with it. If the inner flow tube has stayed in the resistor section, simply grasp the resistor sleeve [7] on the flow tube and pull out the assembly. - Page 23 Maintenance Figure 2 Resistor Removal...
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Page 24: Installing The Resistor
Termaline® Load Resistor Installing the Resistor 1. Inspect the load housing assembly. See "Inspecting the Unit" on page 12 2. Insert new resistor [1] into the load housing until it reaches its fitting. 3. Push in the resistor until it bottoms snugly. Note: The resistor should not have to be forced into the fitting, but it should be quite snug. - Page 25 Maintenance Note: Normally, at this stage of the disassembly, the outer flow tube [10] will remain with the load housing. Restore it to this position after inspection and cleaning if it should come out. 5. Inspect the inside of the load housing for any apparent damage. See "Inspecting the Unit"...
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Page 26: Installing A Replacement Resistor
Termaline® Load Resistor Installing a Replacement Resistor 1. Insert replacement resistor [1] into the resistor fitting of the input center conductor assembly to test its tightness. 2. Push in the resistor until it bottoms snugly. Note: The resistor should not have to be forced into the fitting, but it should be quite snug. 3. -
Page 27: Replace The Lamp
4. Remove the lamp. 5. Install the new lamp by reversing this procedure. Additional Repairs Repairs beyond what is covered in this instruction book will require return of the equipment to Bird Electronic Corporation for service. See "Customer Service" on page 18... -
Page 28: Storage
Any maintenance or service procedure beyond the scope of those in this chapter should be referred to a qualified service center. If the unit needs to be returned for any reason, request an Return Material Authorization (RMA) through the Bird Technologies website. All instruments returned must be shipped prepaid and to the attention of the RMA number. -
Page 29: Specifications
Maintenance Specifications Power Rating 30,000 Watts lmpedance 50 ohms Input Connectors Model 8745 3-1/8. EIA flanged (50 ohm) Model 8746 3-1/8. unflanged (50 ohm) flush center conductor Frequency Range 1000 Hz to 900 MHz VSWR 1.10 max. 1 kHz to 900 MHz Modes CW, AM, FM, SSB, TV, and certain Pulse types... -
Page 30: Replacement Parts
Termaline® Load Resistor Replacement Parts Figure Item Description Replacement Kit Part Number 2 and 3 Resistor RPK8755-027-3 8755-027-3 Outer resistor cap seal, O-Ring 8740-020 8410-009 Water chamber 8755-014 Inlet seal O-Ring 8740-020 5-099 Hose nipple 5-065-2 Socket head cap screws, 1121-2508-00 1/4-20 x 2-1/2”, stainless steel Resistor sleeve... -
Page 31: Optional Equipment
Maintenance Optional Equipment Description Part Number Water flow switch 5-898-3 Control assembly - 115 V 8750-101-1 Relay retaining clamp 8630-193 Time delay relay - 115 V* 5-1664 Indicator light* 8750-106 Incandescent lamp - 115 V 5-970-1 Pipe nipple (flow switch) 5-489-1 Hex bushing (flow switch) 5-490-1... -
Page 32: Limited Warranty
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 specifica- tions, drawings, blueprints and/or samples. Seller’s sole obligation under these warranties shall be to issue credit, repair or replace any item or part thereof which is proved to be other than as warranted;...
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