BIRD TERMALINE 8745 Series Instruction Book
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BIRD TERMALINE 8745 Series Instruction Book

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INSTRUCTION BOOK
TERMALINE
SERIES 8745/8746
Bird® Electronic Corporation
30303 Aurora Road
Cleveland (Solon), Ohio 44139
Sales & Technical Support:
Sales email:
Technical Support email:
®
LOAD RESISTOR
440-248-1200
866-695-4569 toll free
sales@bird-technologies.com
atechapp@bird-technologies.com
©Copyright 2010 by Bird Electronic Corporation
Instruction Book Part Number 920-8745/46 Rev. C
Termaline
®
is a Registered Trademark
of Bird Electronic Corporation

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  • Page 1 Cleveland (Solon), Ohio 44139 Sales & Technical Support: 440-248-1200 866-695-4569 toll free Sales email: sales@bird-technologies.com Technical Support email: atechapp@bird-technologies.com ©Copyright 2010 by Bird Electronic Corporation Instruction Book Part Number 920-8745/46 Rev. C ® Termaline is a Registered Trademark of Bird Electronic Corporation...
  • Page 2 I am not blank...

  • Page 3: Safety Symbols

    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 publica- tion. These precautions must be thoroughly understood and apply to all phases of operation and maintenance.

  • Page 4: Warning Statements

    This symbol indicates that a shock hazard exists if the precau- tions in the instruction manual are not followed. The caution symbol appears on the equipment indicating there is important information in the instruction manual regarding that particular area. This symbol indicates that the unit radiates heat and should not be touched while hot.

  • Page 5: Safety Statements

    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.
  • Page 6 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 SO. SERVICIO LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVO DEL PERSONAL DE SERVICIO CAPACITADO. PARA EVITAR EL PELIGRO DE DESCARGAS ELÉCTRICAS, NO REALICE NINGÚN SERVICIO A MENOS QUE ESTÉ...
  • Page 7 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.

  • Page 8: About This Manual

    About This Manual This manual covers the operating and maintenance instructions for the following models 8745 8746 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 Additional Repairs ..........17 Storing .

  • Page 11: Chapter 1 Introduction

    Chapter 5, Maintenance. Direct Power Measurement When used in conjunction with a Bird Model 4600A or 4805A Thruline Watt- meter, these load resistors may be used for direct reading power measure-...
  • Page 12 Introduction...

  • Page 13: Chapter 2 Theory Of Operation

    Chapter 2 Theory of Operation General This load resistor utilizes an external water supply for the direct cooling of the resistor element. By using this technique, the need for an intermediate dielec- tric fluid to transfer the heat generated in the resistor element has been elim- inated, reducing the physical size of the load to a virtual minimum.

  • Page 14: Cooling Water

    Theory of Operation Cooling Water The electrical performance of these RF loads is affected by impurities or other chemical additives in the cooling water. The presence of salts in the water defi- nitely makes the device unusable because salts cause a rapid increase in VSWR. Therefore, sea water or silty water should not be used for cooling the loads.

  • Page 15: Chapter 3 Installation

    See “Flow Switch (Optional)” on page 6 for alternate field installation. To connect to a rigid piping connection, replace the water inlet and outlet hose adapters, Bird P/N 5-065-2, with ½ inch male pipe or pipe fittings. Take special care when connecting the water lines. The inside of the load is designed so that the water flows properly in only one direc- tion - from the inlet to the outlet.

  • Page 16: Flow Switch (Optional)

    Connect with a ½ inch NPT Nip- ple and a ½ 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 17: Chapter 4 Operating Instructions

    Chapter 4 Operating Instructions General CAUTION DO NOT disconnect the water flow switch leads from the control assembly. Any operation of the load without a properly functioning cooling system will cause almost immediate destruction of the resistor element. WARNING Never attempt to disconnect the equipment from the transmission line while RF power is being applied.

  • Page 18: Operating As An Rf Wattmeter

    Operating Instructions Operating as an RF Wattmeter The RF load can be combined with a Bird Rigid Line Series Thruline Wattme- ter to form an absorption-type wattmeter by inserting the wattmeter line sec- tion just ahead of the RF load. Installation and operation of the wattmeter is covered in the Thruline Wattmeter Instruction Book.

  • Page 19: Chapter 5 Maintenance

    Chapter 5 Maintenance General WARNING Never attempt to disconnect the equipment from the transmission line while RF power is being supplied. Leaking RF energy is a potential health hazard. The Models 8745/46 Termaline Load Resistors are rugged and simple, requir- ing only nominal and routine attention.

  • Page 20: Preventative Maintenance

    Maintenance Preventative Maintenance Due to the basic simplicity of construction, the major requirement for preven- tive maintenance is to keep the equipment clean. RF Load Resistor Preparation: Tools: Common hand tools Ohmmeter with an accuracy of ± 1% at 50 ohms. Use low resistance leads, preferably a short piece of 50 ohm coaxial cable fitted with alligator clips.

  • Page 21: Replacing A Resistive Element

    Termaline Load Resistor 8745/8746 Replacing a Resistive Element This series of water-cooled loads is designed to be quickly and easily repaired in the field. If in performing the DC resistance check described previously. A significant change in resistance is noted, or if for any reason the resistive ele- ment should fail, inexpensive replacement resistors are available.
  • Page 22 Maintenance Figure 2 Removing the Resistor 1/4-20 x 2-1/2 Socket Head Cap Screw (6 Req'd) Hose Nipple (2) (Not used in Moduload Application) Water Chamber With O-Ring Inner Seal Ground Cap, Resistor (Normally Remains Inside Water Chamber O-Ring, Outer Inner Flow Tube O-Ring Inner Resistor Sleeve O-Ring...

  • Page 23: Inspecting The Unit

    Termaline Load Resistor 8745/8746 Figure 3 RF Input Assembly Inspecting the Unit Note: Perform this once the resistor has been successfully removed. 1. Inspect the resistor carefully to ensure that it is not fractured. Note: In the majority of cases, even in the event of resistor failure, the resistor substrate will remain intact.

  • Page 24: Replacing The Resistor

    Maintenance Replacing the Resistor 1. Inspect the load housing assembly. See “Inspecting the Unit” on page 13. 2. Insert new resistor [1] into the load housing until it reaches its fitting. 3. Push in the resistor until it bottoms snugly. Note: If resistor seems to be loose, see “Replacing Fractured Resis- tors”...

  • Page 25: Installing A Replacement Resistor

    Termaline Load Resistor 8745/8746 2. Loosen and remove the six (6\ 1/4-20 x 1 inch socket head cap screws [16] from the flanged end of the load housing. Note: Use a 3/16 inch Allen wrench. Note: As shown in Figure 2, the outer conductor assembly may now be easily removed.

  • Page 26: Removing The Front Connector Assembly

    Maintenance Removing the Front Connector Assembly Note: This portion of the load unit consists of the inner conductor [11] or [13] and the outer conductor [12] or [14], respectively. 1. Remove the six screws [16] at the front of the housing flange. 2.

  • Page 27: Replacing The Pilot Light

    5. Install the new pilot lamp by revsersing 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 Ser- vice” on page 18. Storing Note: If the load is to be unused or stored for any length of time, completely drain it of any coolant and cap the openings.

  • Page 28: Customer Service

    If you need to return the unit for any reason, request an RMA through the Bird Technologies website (link shown below). All instruments returned must be shipped prepaid and to the attention of the RMA number.

  • Page 29: Specifications

    Termaline Load Resistor 8745/8746 Specifications Power Rating 20,000 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 kHz to 900 MHz Modes CW, AM, FM, SSB, TV, and certain Pulse types Input Water Temperature Range...

  • Page 30: Replacement Parts

    Maintenance Replacement Parts Customer Replacement Part Consists of Description RPK8755-027-2 8755-027-2 Resistor 50.75 ohm 20kW 923-RPK000 Instruction Sheet 8740-025 8755-025 Inner Flow Tube 8755-024 Outer Flow Tube 8740-020 O-Ring Kit 8755-005 Resistor Cap Assembly 8755-016 Resistor Contact 8755-026 Resistor Holder 923-8740-025 Instruction Sheet 8740-020...

  • Page 31: Optional Equipment

    Termaline Load Resistor 8745/8746 Optional Equipment Control and Water Flow Parts - not shown on Figures Description Part Number Water flow switch 5-898-2 Control assembly - 115 V 8750-101-1 Control assembly - 230 V 8750-101-2 Relay retaining clamp 8630-193 Time delay relay - 115 V 5-1664 Time delay relay - 230 V 5-1665...

  • 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 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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Termaline 8746 series

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