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Summary of Contents for BIRD Termaline 8765 Series
- Page 1 Termaline® Load Resistor Series 8765/8766 Operation Manual © Copyright 2025 by Bird Technologies, Inc. Instruction Book Part Number 920-8765/66 Rev. E ® Termaline is a Registered Trademark of Bird Electronic Corporation...
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Page 3: Safety Precautions
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. Keep Away From Live Circuits Operating Personnel must at all times observe general safety precautions. -
Page 4: Safety Symbols
Termaline® Load Resistor Safety Symbols Warning notes call attention to a procedure, which if not correctly performed, could result in personal injury. Caution notes call attention to a procedure, which if not correctly performed, could result in damage to the instrument. Calls attention to supplemental information. -
Page 5: Caution Statements
Safety Precautions Caution Statements The following equipment cautions appear in the text and are repeated here for emphasis. Do not use Automotive anti-freeze, stop-leak solutions, sealants, or corrosion inhibitors used in coolant solutions for these loads. Use of these additives can negatively impact load performance and may cause premature failure. -
Page 6: Safety Statements
Termaline® Load Resistor 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 7 Safety Precautions 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.
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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 8765 8766 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 Installing the Resistor ............... 13 Replacing Fractured Resistors .
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Page 11: Chapter 1 Introduction
"Maintenance" on page 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 40 kilowatts. Optional Equipment Bird recommends the installation of an interlock control circuit to provide instantaneous fail-safe protection of the transmitter and load in the event of even a momentary interruption of the cooling water supply. -
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: Cooling Water
Water is the primary coolant for the Bird 8765/66, however, a mixture of potable / distilled water and pure technical grade ethylene glycol is acceptable in closed systems. Ethylene glycol should be added to prevent bacterial growth and freezing;... -
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
INLET, at the back on center, and water OUTLET, adjacent at 90° to the inlet, mate with 3/4 inch water hose connectors. For rigid piping connections, replace both the water inlet and outlet hose adapters, Bird P/N 5-065-2, with 1/2 inch male pipe or pipe fittings. -
Page 16: 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 are followed exactly. -
Page 17: Power On Procedure
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 18: Chapter 5 Maintenance
Chapter 5 Maintenance General 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 8765/66 Termaline Coaxial Load Resistors are rugged units of simple design, requiring only nominal and routine attention. -
Page 19: Rf Assembly Resistance Test
Maintenance RF Assembly Resistance Test These tests are by no means a necessity to the operation of the load but merely guidelines for the user’s 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 20: Troubleshooting
Termaline® Load Resistor Troubleshooting For corrections requiring repair or replacement of components, refer to the appropriate section for your specific model. Problem Possible Cause Correction "RF Assembly High load VSWR. Failing resistor Perform Resistance Test " on page 9 . Resistance change of greater than 5 ohms indicates a failing resistor. -
Page 21: Inspecting The Unit
Maintenance 7. Pull the water chamber assembly (with screws) straight off. The inner flow tube [9] will usually come out with the water chamber assembly, being held to it by the compression of the inner O-ring [4] (water input) seal. This is normal, and if the resistor body is unbroken, there will be no need to remove the inner flow tube from water chamber assembly. - Page 22 Termaline® Load Resistor Figure 2 Resistor Removal...
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Page 23: Installing The Resistor
Maintenance Installing the Resistor 1. Inspect the load housing assembly. See "Inspecting the Unit" on page 11 2. Insert new resistor [1] into the load housing until it reaches its fitting. 3. Push in the resistor until it bottoms snugly. The resistor should not have to be forced into the fitting, but it should be quite snug. -
Page 24: Replacing Fractured Resistors
Termaline® Load Resistor Replacing Fractured Resistors The resistor used in this load consists of a resistive film on a special substrate. If the substrate is broken, there will probably be sharp pieces or splinters inside the load housing. Caution should be exercised to avoid possible injury. The load should already be disassembled to the point of step 7 "Replacing a Resistive Ele-... - Page 25 Maintenance Figure 3 RF Input Assembly...
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Page 26: Installing A Replacement Resistor
11. Continue using the procedure as given in "Installing the Resistor" on page 13 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 17... -
Page 27: 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 28: Specifications
Termaline® Load Resistor Specifications Power Rating 40,000 Watts lmpedance 50 ohms Input Connectors Model 8765 3-1/8 EIA Flanged, (50 ohm) Model 8766 3-1/8 Unflanged, (50 ohm) Frequency Range 1 kHz to 900 MHz VSWR 1:10 maximum 1000 Hz - 900 MHz Modes CW, AM, FM, SSB, TV, and certain Pulse types lnput Water Temperature Range... -
Page 29: Replacement Parts
Maintenance Replacement Parts Figure Item Description Replacement Kit Part Number 2 and 3 Resistor RPK8755-027-4 8755-027-4 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 8740-025 8755-026... -
Page 30: Accessory Coupling Kits
Termaline® Load Resistor Accessory Coupling Kits Fits Model Description Part Number Model 8765 Coupling Kit - 3-1/8” EIA 4600-020 consisting of: Anchor Bullet 4600-021 O-Ring 4600-022 Mounting Hardware 4600-023 Model 8766 Coupling Kit - 3-1/8” Unflanged Flush - 50 ohm 5-726 consisting of: Center Conductor Coupling Bullet... -
Page 31: 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 specifications, 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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