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RF Directional

Thruline® Wattmeter

MODEL 4304A

Operation Manual

Instruction Book Part Number 920-4304A Rev. F

Thruline® and Termaline® are registered trademarks

of Bird Electronic Corporation

Summary of Contents for Thruline 4304A

Page 1: ...Thruline Wattmeter MODEL 4304A Operation Manual Copyright 2016 by Bird Technologies Inc Instruction Book Part Number 920 4304A Rev F Thruline and Termaline are registered trademarks of Bird Electroni...

Page 2: ...to remove the RF transmission line while RF power is present WARNING Do Not Service Or Adjust Alone Under no circumstances should any person reach into an enclosure for the purpose of service or adjus...

Page 3: ...ed here for emphasis 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 n...

Page 4: ...EBEN KANN DIE GER TESICHERHEIT BEEINTR CHTIGT WERDEN UTILISATION TOUTE UTILISATION DE CET INSTRUMENT QUI N EST PAS EXPLICITEMENT PR VUE PAR LE FABRICANT PEUT CAUTION Above 800 MHz do not exceed 150 W...

Page 5: ...s iv ENDOMMAGER LE DISPOSITIF DE PROTECTION DE L INSTRUMENT IMPIEGO QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME SPECIFICATO DAL PRODUTTORE LA PROZIONE DI SICUREZZA POTREBBE VEN...

Page 6: ...WARTUNG DES GER TES GELTEN NUR F R GESCHULTES FACHPERSONAL ZUR VERMEIDUNG GEF HRLICHE ELEKTRISCHE SCHOCKS SIND WARTUNGSARBEITEN AUSSCHLIE LICH VON QUALIFIZIERTEM SERVICEPERSONAL DURCHZUF HREN ENTRENTI...

Page 7: ...NT H F CONSERVER L L MENT DANS LA PRISE LORS DE L EMPLOI HF SPANNUNG KANN IN DER HF ELEMENT BUCHSE ANSTEHEN ELEMENT W HREND DES BETRIEBS EINGEST PSELT LASSEN PUEDE HABER VOLTAJE RF EN EL ENCHUFE DEL E...

Page 8: ...tle page Literature Contents Chapter Layout Introduction Describes the features of the 43 Wattmeter lists equipment supplied and optional equipment and provides power up instructions Theory of Operati...

Page 9: ...Viewpoint 2 Coupling Circuit 3 Load Power 4 Standing Wave vs Traveling Wave Viewpoint 4 vs Component Testing 7 Impedance Mismatch 8 Chapter 3 Installation 9 Connections 9 Load Matching 9 Chapter 4 Op...

Page 10: ...line Wattmeter 4304A ix Calibration Checks 19 Setup Test 19 Calibrating a Bird Element 4304A 1 19 Storage 21 Customer Service 21 Specifications 22 Replacement Parts 22 Available QC Type Connectors 23...

Page 11: ...croammeter is specially shock mounted A screw on the lower front face of the meter is used to zero the pointer Below the meter face the RF line section protrudes slightly from the wattmeter housing wi...

Page 12: ...voltage Ef and current If in phase with Ef If Zo The reflected wave and its power originates by reflection at the load and travels from the load back to the source It has an RF voltage Er and current...

Page 13: ...e corresponding capacitive current while thatproducedbythewavetravelingintheoppositedirectionwillsubtract Theadditive or arrow direction is assigned to the forward wave The electrical characteristics...

Page 14: ...ts drawbacks are that it is usually too long too expensive for good accuracy not portable and too slow These problems grow rapidly as the measurement frequency drops below 1000 MHz The Thruline Wattme...

Page 15: ...ful approximate picture of the results without bothering to calculate the power ratio exactly Consider that for an antenna matching problem the main objective usually is to minimize Wr Anything done e...

Page 16: ...RF Directional Thruline Wattmeter 4304A 6 Figure 4 Percent Reflected Power vs VSWR 1 0 8 0...

Page 17: ...Termaline absorption wattmeter Line loss using open circuit calibration The high directivity of elements can be exploited in line loss measurements by having the load connector open or short circuite...

Page 18: ...Consider using a Bird 4304A to tune a 70 line If the load impedance is also 70 the wattmeter will measure a VSWR of 70 50 1 4 However if you remove the wattmeter the VSWR will actually be 1 0 Similar...

Page 19: ...btained removing the wattmeter will not change the match quality A 50 load can terminate a 50 transmission line of any length without altering conditions at the transmitter The wattmeter is just an ad...

Page 20: ...uency of interest If more than one frequency is involved a separate cable length is required for each See Figure 5 for sample cable lengths Note Cable length is measured from end to end of the outer c...

Page 21: ...Installation 11 Figure 5 Cable Length Wavelength Matching...

Page 22: ...on table is located on the back cover plate of the unit Multiply the measured power by the correction factor to determine the actual power VSWR Measurements For your convenience a set of VSWR conversi...

Page 23: ...Operating Instructions 13 Figure 6 VSWR Conversion Graph Reflected Power 0 2 20 0...

Page 24: ...RF Directional Thruline Wattmeter 4304A 14 Figure 7 VSWR Conversion Graph Reflected Power 0 01 1 00...

Page 25: ...ing can be cleaned with a soft cloth dampened with a mild detergent solution Do not wipe the meter glass with a dry cloth or a static charge could develop that would cause an erroneous meter indicatio...

Page 26: ...ng No RF power Check RF source Arrow on element pointing wrong way Rotate element Meter burned out or damaged Replace the meter Refer to page 18 Intermittent or inconsistent meter reading Dirty DC con...

Page 27: ...it will need to be returned to a Bird Service Center for recalibration Changing elements without recalibrating will result in inaccurate readings 1 Remove the screw at the lower left corner of the ele...

Page 28: ...defective return the unit to a Bird Service Center Meter Replacement 1 Use a 5 16 hex wrench to loosen the nuts on the meter terminals Remove the wires from the terminals 2 Remove both screws on the s...

Page 29: ...the RF source to produce a signal with power in the upper one third of the scale for each power range 3 Compare the reading on the Bird 4304A with the reference wattmeter Note If the unit is outside...

Page 30: ...4A range switch to 5 10 Divide 50 by the average value calculated in Step 6 then set the RF source to this value at a frequency of 100 MHz 11 Adjust R10 until the 4304A meter indicates 4 0 12 Set the...

Page 31: ...ce 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 Authorizat...

Page 32: ...MHz Accuracy 25 100 MHz 100 512 MHz 512 1000 MHz 7 of full scale with correction factor 6 of full scale 7 of full scale Impedance Nominal 50 Connectors Bird QC Female N or UHF normally supplied Operat...

Page 33: ...0 N Male 4240 063 HN Female 4240 268 SMA Female 4240 336 HN Male 4240 278 SMA Male 4240 334 LC Female 4240 031 7 16 Jack IEC Type 169 4 4240 344 LC Male 4240 025 7 16 Plug IEC Type 169 4 4240 363 UHF...

Page 34: ...y such claim for breach of these warranties shall be deemed to be waived by Buyer unless made in writing within ten 10 days from the date of discovery of the defect The above warranties shall not exte...

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