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INSTRUCTION BOOK
OPERATING INSTRUCTIONS
®
THRULINE
WATTMETER
MODEL 4308
Electronic Corporation
Cleveland (Solon) Ohio USA
©Copyright 2007 by Bird Electronic Corporation
Instruction Book Part Number 920-4308 Revision D
®
Thruline
is a Registered Trademark
of Bird Electronic Corporation
www.valuetronics.com
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Table of Contents
Related Manuals for Bird Electronic THRULINE 4308
Summary of Contents for Bird Electronic THRULINE 4308
- Page 1 INSTRUCTION BOOK OPERATING INSTRUCTIONS ® THRULINE WATTMETER MODEL 4308 Electronic Corporation Cleveland (Solon) Ohio USA ©Copyright 2007 by Bird Electronic Corporation Instruction Book Part Number 920-4308 Revision D ® Thruline is a Registered Trademark of Bird Electronic Corporation www.valuetronics.com...
- Page 2 Bird Model 4308 Thruline Wattmeter www.valuetronics.com...
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Page 3: 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. 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. - Page 4 Bird Model 4308 Thruline Wattmeter 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. This symbol appears on the equipment indicating there is important information in the instruction manual regarding that particular area.
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Page 5: 4308 Safety Statements
4308 Safety Statements USAGE ANY USE OF THIS INSTRUMENT IN A MANNER NOT SPECIFIED BY THE MANUFACTURER MAY IM- PAIR THE INSTRUMENT’S SAFETY PROTECTION. EL USO DE ESTE INSTRUMENTO DE MANERA NO ESPECIFICADA POR EL FABRICANTE, PUEDE ANU- LAR LA PROTECCIÓN DE SEGURIDAD DEL INSTRU- MENTO. - Page 6 Bird Model 4308 Thruline Wattmeter 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 CAPACI- TADO.
- Page 7 OPPORTUNAMENTE ADDESTRATO. PER EVITARE PERICOLOSE SCOSSE ELETTRICHE NON EFFETTU- ARRE ALCUNA RIPARAZIONE A MENO CHE QUALIFICATI A FARLA. RF VOLTAGE MAY BE PRESENT IN RF ELEMENT SOCKET - KEEP ELEMENT IN SOCKET DURING OP- ERATION. DE LA TENSION H.F. PEAT ÊTRE PRÉSENTE DANS LA PRISE DE L’ÉLÉMENT H.F.
- Page 8 Bird Model 4308 Thruline Wattmeter www.valuetronics.com...
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Page 9: About This Manual
About This Manual This instruction book covers the model 4308 Thruline Wattmeter. This instruction book is arranged so that essential information on safety is contained in the front of the book. Reading the Safety Precautions Section before operating the equipment is strongly advised. The remainder of this instruction book is divided into Chapters and Sections. - Page 10 Bird Model 4308 Thruline Wattmeter www.valuetronics.com...
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Page 11: Table Of Contents
Table Of Contents afety Precautions......i Warning Statement..... . . Caution Statement. - Page 12 Bird Model 4308 Thruline Wattmeter Operating Instructions..... 9 Zero Adjust......9 Range Switch and Power Measurement.
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Page 13: Introduction
Chapter 1 Introduction This chapter contains introductory information including product specifications, items supplied, and accessory items. Purpose and Function The Model 4308 Thruline Wattmeter is a portable multi-range RF wattmeter. It is a device which requires no external power source or batteries for operation. It is used to measure RF power when inserted into a transmission line of 50 ohms impedance. -
Page 14: Specifications
Bird Model 4308 Thruline Wattmeter Specifications 50 ohms nominal Impedance: 1.5, 5, 15, 50 Watts Full Scale Power Range: Insertion VSWR: 1.05 max. from 440-512 MHz Female “TNC” Connector 1.07 max. from 512 to 960 MHz Female “UHF” Connector 1.08 max. from 440-512 MHz 1.12 max. -
Page 15: Theory Of Operation
Chapter 2 Theory Of Operation Travelling Wave Viewpoint The operation of the Model 4308 wattmeter is based on the travelling wave concept of RF transmission. As RF power is applied to a transmission line, there is a forward wave travelling from the transmitter to the load and a reflected wave travelling from the load back to the transmitter. - Page 16 Bird Model 4308 Thruline Wattmeter Figure 1 Model 4308 Outline Drawing RUBBER FEET (4) Q.C. CONNECTOR 6-7/8 (175mm) TRANSIT ELECTRONIC 50 W 440-960 MHz 4308-1 4240-156 1-3/4 (44mm) 1-5/16 (33mm) 3-3/8 4" RUBBER FEET(4) (86mm) (101mm) 3-5/8 (92mm) 3-29/32 (99mm) "...
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Page 17: Power
Theory Of Operation Power Since there is a definite relationship between the standing wave ratio and the forward- reflected power ratio, the forward and reflected powers may be read from the Thruline Wattmeter and converted to VSWR. The charts are furnished in this Instruction Book. Coupling Circuit The coupling circuit which samples the travelling waves is in the Plug-In Element. - Page 18 Bird Model 4308 Thruline Wattmeter currents will flow according to the direction of the travelling waves producing them, whereas the capacitive portion of these currents is independent of the direction. Therefore, in either position of the Plug-In Element, the coupling currents produced from the waves of one direction will add in phase, and those produced from waves of the opposite direction will accordingly subtract in phase.
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Page 19: Installation
Chapter 3 Installation Portability CAUTION Do not drop the Thruline Wattmeter equipment or submit it to hard blows. The voltmeter circuitry or microammeter, even though it is shock mounted, may be damaged by severe impact. The Model 4308 is a portable instrument, and the housing is not designed for fixed mounting. - Page 20 Bird Model 4308 Thruline Wattmeter Rotate the element so that the arrow points in the direction of power flow. If coaxial cables other than 50 ohm impedance are used, a mismatch will occur which may cause serious inaccuracies in the readings. Figure Element Direction...
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Page 21: Operating Instructions
Operating Instructions Chapter 4 Operating Instructions A description of the features of the Thruline Wattmeter have been discussed in the previous sections. Read and become familiar with the following instructions before operating the Model 4308. As mentioned, no batteries or external power sources are required to operate the meter. -
Page 22: Vswr Calculations
Bird Model 4308 Thruline Wattmeter The Model 4308 is supplied with a special broadband 50 W element with a frequency range of 440-960 MHz. This element is capable of operating at lower power levels and up to 50 watts equally as well. At lower power levels, the range switch should be turned to a lower setting for better resolution. - Page 23 Figure 5 VSWR Conversion Nomograph Reflected Power Forward Power VSWR= Reflected Power Forward Power 2.0 2.5 3.0 4.0 5.0 25 30 150 200 400 500 FORWARD POWER - WATTS www.valuetronics.com...
- Page 24 Bird Model 4308 Thruline Wattmeter Figure 6 VSWR Conversion Nomograph 2.0 2.5 3.0 150 200 4.0 5.0 25 30 40 50 400 500 FORWARD POWER - WATTS www.valuetronics.com...
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Page 25: Maintenance
Chapter 5 Maintenance This chapter includes cleaning, inspection, troubleshooting, and performance information. Troubleshooting Use the following table to aid in isolating problems, their possible cause, and corrections. Cleaning Problem Possible Cause Correction No meter in- No RF power applied to unit. Check RF source and check dication cables. -
Page 26: Repair And Replacement
Bird Model 4308 Thruline Wattmeter Problem Possible Cause Correction Intermittent Faulty transmission line or Inspect line or Inconsis- antenna tent Meter Sticky or defective meter Replace or return wattmeter Readings to the factory for meter replacement and calibration Dirty dc contact on element Clean contact High VSWR Bad load or poor connectors... -
Page 27: Meter Housing
Line Section or Element Coupling Circuit If a problem should occur in the line section or element coupling circuit, it is advised that the unit be returned to Bird Electronic Corporation for repair and recalibration. Meter Housing For access to the inside of the meter housing, the back cover must be taken off. To do... -
Page 28: Element Removal
Bird Quick-Change Connectors. Other “QC” connectors are available. These connectors may be obtained from Bird Electronic Corporation. Refer to the Available Connector List. These “QC” connectors are quickly changed by: Remove the four 8-32 round head machine screws from the cor- ners of the connector flange. -
Page 29: Calibration Checks
Maintenance Meter Replacement To replace the meter in the unit follow these steps: Disconnect the meter leads from the terminals on the back of the meter. Remove the screws securing the meter in place. The screws are lo- cated on each side of the housing. Pull the meter, with the shock mount assembly, straight out of the unit. -
Page 30: Customer Service
Customer Service Any maintenance or service procedure beyond scope of those provided in this section should be referred to a qualified service center. Bird Electronic Corporation maintains complete repair and calibration facilities at the following address: Figure 7... -
Page 31: Sales / Repair Facilities
Sales / Repair Facilities U.S.A. Sales and Manufacturing Bird Electronic Corporation 30303 Aurora Road Cleveland (Solon), Ohio 44139-2794 Phone: (440) 248-1200 Fax: (440) 248-5426 Sales Facilities European Sales Office Bird Electronic Corporation Berkhamsted House 121 High Street Berhamsted Hertfordshire HP4 2DJ England... -
Page 32: Replacement Parts List
Bird Model 4308 Thruline Wattmeter Replacement Parts List Item Qty. Description Part Number Micrometer Meter 2120-017 Housing Assembly 4410-003 Cover Assembly 4210-005-1 Line Section Assembly 4308-003 Carrying Strap 8580-003 RF Connectors *See table Meter Bumper Feet 4220-098 Range Switch Knob 5-1852 Range Switch Label 4308-006... - Page 33 Maintenance *Available “QC” Type Connectors Connector Part Number Connector Part Number N-Female 4240-062 LT-Female 4240-018 N-Male 4240-063 LT-Male 4240-012 HN-Female 4240-268 C-Female 4240-100 HN-Male 4240-278 C-Male 4240-110 LC-Female 4240-031 UHF-Female 4240-050 LC-Male 4240-025 UHF-Male 4240-179 BNC-Female 4240-125 TNC-Female 4240-156 BNC-Male 4240-132 TNC-Male 4240-160...
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Page 34: 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 war- ranties shall be to issue credit, repair or replace any item or part thereof which is proved to be other than as warranted;... - Page 35 www.valuetronics.com...
- Page 36 QUALITY INSTRUMENTS FOR RF POWER MEASUREMENTS From 2 to 4000 MHz and from 25 milliwatts to 250 kilowatts in 50 ohm coaxial line systems ® TERMALINE ABSORPTION WATTMETERS LOAD RESISTORS CALORIMETERS ® THRULINE DIRECTIONAL MONITORING WATTMETERS ® TENULINE ATTENUATORS ® COAXWITCH SELECTOR SWITCHES...
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