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INSTRUCTION BOOK

Operator Manual

AT-400 Antenna Tester

Instruction Book Part Number 920-AT400 Rev G

Содержание AT-400 Antenna Tester AT-400

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Страница 3: ...times observe normal safety regulations Do not replace components or make adjustments to the equipment with high voltage turned on To avoid casualties always remove power Do Not Service Or Adjust Alo...

Страница 4: ...icating there is important information in the instruction manual regarding that particular area See page 16 and 37 for specific cautions NOTE Calls attention to supplemental information WARNING Warnin...

Страница 5: ...RF energy Do not touch or ground the center conductor of a live RF connection Failure to comply may result in equipment damage and serious burns or death to personnel CAUTION Required input is 11 to 1...

Страница 6: ...connect transmitter output to the AT 400 Damage can also be caused by testing antennas near other transmitting antennas If testing base station antennas first measure the power at the coax end to be...

Страница 7: ...ENT IMPIEGO QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO DIVERSO DA COME SPECIFICATO DAL PRODUTTORE LA PROZIONE DI SICUREZZA POTREBBE VENIRNE COMPROMESSA SERVICE SERVICING INSTRUCTIONS ARE FOR...

Страница 8: ...RENTIEN L EMPLOI DES INSTRUCTIONS D ENTRETIEN DOIT TRE R SERV AU PERSONNEL FORM AUX OP RATIONS D ENTRETIEN POUR PR VENIR UN CHOC LECTRIQUE DANGEREUX NE PAS EFFECTUER D ENTRETIEN SI L ON N A PAS T QUAL...

Страница 9: ...ual please send your comments to our factory This manual may be periodically updated when inquiring about updates to this manual refer to the part number and revision level on the title page Typograph...

Страница 10: ...00 to antenna systems and to power sources to charge and operate the unit Measure Match Since the AT 400 Antenna Tester offers a unique method of measuring Antenna Systems we have included the section...

Страница 11: ...ix...

Страница 12: ...d 9 Installation 15 Power Supply 15 Connecting the Antenna 16 Measure Match 17 Understanding the Operating Modes 17 Swept Frequency 21 Limit Testing 25 Single Frequency 28 Field Strength 31 Maintenanc...

Страница 13: ...1 Chapter 1 Introduction Items Supplied 1 Bird AT 400 2 AC Mains Adapter 3 Female TNC Connector 4 Field Strength Antenna 5 Instruction Book Not Shown Figure 1 Supplied Items 1 3 4 2...

Страница 14: ...2 Component Description 1 LCD Display Backlit liquid crystal display 2 External DC Connector Connect either the ac adapter or the cigarette lighter adapter External supplies operate the unit and char...

Страница 15: ...urn tester on press and hold to turn tester off 6 Key Toggles between positive and negative numbers 7 Enter Key Completes data entry 8 ESC Key Back up through menu structure At the top menu level blan...

Страница 16: ...on Figure 3 Display Description Freq MHz Units Manual Scale Auto Scale Audio Off Low Batt VSWR 1 2 1 5 260 00 Mhz 1 35 Busy Limit Trace Sweep Type Meas Units Band VSWR 2 0 1 0 65 00 MHz 520 00 260 00...

Страница 17: ...Displays frequency band selected 6 Cursor Used to select measurement position on the trace 7 Utility Label Area for displaying general data Lo Batt Busy Hold Noise and test results 8 Frequency Selecte...

Страница 18: ...erator can be enabled to produce a tone that is proportional to the match condition Auto Scaling Used in either swept or single frequency modes sets the Y axis for best measurement display Relative Fi...

Страница 19: ...tester AC adapter connectors field strength antenna and instruction book Verification Kit P N 7000A445 Used to verify tester performance Includes standard mismatch and connector adapter Interface Sof...

Страница 20: ...Bird AT 400 Antenna Tester 8...

Страница 21: ...ster on momentarily press the ON key The results of a self test will be displayed if a failure is present For more information about the self test or a failure refer to the maintenance section y To tu...

Страница 22: ...ow Key The LEFT arrow key can be used to backspace erasing one character at a time during data entry Escape ESC Returns to previous menu without initiating a change Select Key The operator instruction...

Страница 23: ...excessive background noise measured The measurement may not be accurate See troubleshooting if this condition is persistent Out of Range Values When entering numeric data it is possible to enter a va...

Страница 24: ...meters to the factory setting follow the steps below y The parameters will be set to the conditions listed below y Press the MENU key y Press the UTIL key y Press the PRESET key Software Parameter Fac...

Страница 25: ...printed or stored The data transfer rate baud rate between the Antenna Tester and computer must be identical and set to 9600 To change the baud rate for the serial port on the Antenna Tester follow th...

Страница 26: ...Bird AT 400 Antenna Tester 14...

Страница 27: ...s shipped with the batteries not charged Charge batteries for at least 8 hours before use NOTE For optimum battery life only charge the batteries after the low battery indicator is displayed y AC Main...

Страница 28: ...ccurate measurements For best results the AT 400 should be used with all transmit antennas powered down WARNING Live RF energy Do not touch or ground the center conductor of a live RF connection Failu...

Страница 29: ...e different operating modes and find what is best for your application Swept Frequency vs Single Frequency Swept frequency graphically displays the unit of measure over a band of frequencies The curso...

Страница 30: ...hence would have a 0 00 reflection coefficient VSWR refers to the ratio of maximum and minimum voltages that are set up on a transmission line resulting from the combination of a forward wave and ref...

Страница 31: ...t unit scale to make the trace easier to read However if you plan to look at the size or shape of traces for quick comparisons it might be more meaningful to set a standard scale Remember that it is p...

Страница 32: ...y sweeps the selected frequency band updating the measured value with each sweep An asterisk is blinking on the left side of the display to indicate sweep rate The single hold mode will freeze a trace...

Страница 33: ...ghlighted 1 Enter the frequency using the numeric keypad or change the frequency using the UP DOWN arrow keys 2 Press the ENTER key The cursor will blink on the stop frequency 3 Enter the frequency us...

Страница 34: ...uto or Manual Scale Selecting the scale simply sets up how the information will look on the display y Press the MENU key y Press the SWEPT FREQ key y Press the MEAS UNITS key y Depending on desired mo...

Страница 35: ...ssed the trace is updated y Press the MENU key y Press the SWEPT FREQ key y Press the SWEEP TYPE key y Depending on desired mode press either SINGLE HOLD or CONT key HOLD will be displayed if single h...

Страница 36: ...the trace displayed when you save will be stored y Press the MENU key y Press the SWEPT FREQ key y Press the TRACE key y Press the SAVE TRACE key y Press a REG n key that has empty displayed If you se...

Страница 37: ...ue on the trace and the down arrow key will move it to the lowest y Press the RETURN key to return to register selection y Press the ESC key to return to trace menu Clearing a Trace When a trace is no...

Страница 38: ...indication y Press the MENU key y Press the SWEPT FREQ key y Press the LIMIT key y Pressing the AUDIO key will toggle between on and off Selecting Limit Values Valid limit values depend on measurement...

Страница 39: ...ey where the trace is stored A dotted outline of the limit trace will be displayed with the new trace displayed over it Pass or Fail will be displayed NOTE You can still move the cursor change measure...

Страница 40: ...e of the limit trace will be removed if a trace was being used Single Frequency This mode is useful for tuning antennas particularly with the audio on The frequency can be selected following the instr...

Страница 41: ...l Select Auto or Manual Scale Selecting the scale simply sets up how the information will look on the display y Press the MENU key y Press the SINGLE FREQ key y Depending on desired method press eithe...

Страница 42: ...y The actual range depends on the units selected NOTE Using the arrow keys will keep you in the acceptable range If you are not sure if the larger value should be at the right or left side of the scal...

Страница 43: ...turn loss display with the field strength antenna installed Turn Audio On Off The pitch varies with the field strength y Press the MENU key y Press the FIELD STR key y Pressing the AUDIO key toggles b...

Страница 44: ...Bird AT 400 Antenna Tester 32...

Страница 45: ...ies will provide a minimum of 2 hours continuous operation with the backlight on Charging time is typically 8 hours The batteries are being charged when the Antenna Tester is connected to AC with the...

Страница 46: ...y at initial power up If any test fails check the troubleshooting section for possible correction When displaying the tests as described above a stuck key will be indicated Firmware Rev Revision date...

Страница 47: ...maintained at any battery voltage Be sure the AC mains adapter is not connected y Press the MENU key y Press the TEST key y Press the BATT TEST key y Press the RETURN key to end the test Display Test...

Страница 48: ...1234567890 ABCDEFGH Display Test 1234567890 ABCDEFGH Display Test 1234567890 ABCDEFGH Display Test 1234567890 ABCDEFGH Display Test 1234567890 ABCDEFGH Display Test 1234567890 ABCDEFGH Display Test 1...

Страница 49: ...ter display side down on a clean surface 2 Using a small standard screwdriver remove six screws from the back cover 3 Lift the back cover approximately two inches above the front cover 4 Flip the back...

Страница 50: ...5 of this section Fuse Replacement y Follow the steps outlined in Battery Replacement replacing the fuse where replacing the batteries is indicated CAUTION Replace with only the same type and rating f...

Страница 51: ...may not be securely connected may be damaged or there is no power supplied at the wall receptacle The internal fuse may have opened and requires replacement If the unit was recently opened recheck P2...

Страница 52: ...ls must be removed before resuming measurement Antenna Tester indicates a Perfect Match When measuring the match of an antenna in a high RF environment the Antenna Tester indicates a perfect match i e...

Страница 53: ...in this chapter should be referred to a qualified service center If you need to return the unit for any reason contact the Bird Service Center for a return authorization All instruments returned must...

Страница 54: ...26 Female N Connector 4240 403 Field Strength Antenna 5A2228 3 Instruction Book 920 AT400 Foam Shock Strips 2 5A2243 Optional Adapters N m 4240 402 BNC m 4240 404 BNC f 4240 405 TNC m 4240 406 TNC f 4...

Страница 55: ...r Field Interchangeable Female N Field Strength Range 0 to 100 Relative Sensitivity Full scale deflection at 0 22 Volts Meter at 400 MHz depending on gain setting Power Requirements Batteries Six Rech...

Страница 56: ...Clear Trace Return Value Trace Lim Clear Limit Return Band Meas Units Sweep Type Trace Limit Rho Audio ON OFF Start Stop MHz Center MHz Span MHz Return Single Freq VSWR Match Return Loss Return Rho F...

Страница 57: ...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 extend...

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