Tektronix 1705A Manual do Utilizador

Instruction Man ual1705ASpectrum Monitor (SN B040000 and Above)070-8222-08WarningThe servicing instructions are for use by qualifiedpersonnel only. To

1705A Spectrum MonitorixGeneral Safety SummaryReview the following safety precautions to avoid injury and prevent damage tothis product or any product

Checks and Adjustments1705A Spectrum Monitor5-5s. CHECK -- that the readout still reads 1000, ±10.u. CHECK -- that the marker is on screen.v. CHECK --

Checks and Adjustments5-61705A Spectrum MonitorTable 5- 1: Preliminary Control SettingsPOWER ONINTENSITY Set to PreferenceFOCUSSCALEVERTICAL POSITION

Checks and Adjustments1705A Spectrum Monitor5-7c. Connect the leveled sine wave generator output to the comb generator.Connect the comb generator outp

Checks and Adjustments5-81705A Spectrum Monitora. Adjust FOCUS, INTENSITY, SCALE, and SWEEP SPEED for auseable display.b. Place the 2ndmarker on the l

Checks and Adjustments1705A Spectrum Monitor5-9! !SG503VARIABLEAUTOTRANSFORMER70 MHzINPUT1705AFigure 5-3: Output of the SG503 connected directly to th

Checks and Adjustments5-101705A Spectrum Monitor6. Check Resolution FilterREQUIREMENT -- 300 kHz Filter Resolution 200 -- 400 kHz. 10 kHzFilter Resolu

Checks and Adjustments1705A Spectrum Monitor5-11k. CHECK -- that the marker tip is on the crt center line ±1 minorDivision (vertically).8. Check Video

Checks and Adjustments5-121705A Spectrum Monitor10. Check L--Band LinearityREQUIREMENT -- One marker per Division ±1 minor Division.a. Connect the out

Checks and Adjustments1705A Spectrum Monitor5-13ALIGN 2ndMARKER HEREDISREGARD#1GRATICULELINE#2GRATICULELINEFigure 5-5: Aligning L- Band time markers w

Checks and Adjustments5-141705A Spectrum Monitorh. Change the leveled sine wave generator Frequency to 5 MHz, AmplitudeMultiplier to X1, and the Ampli

General Safety Summaryx1705A Spectrum MonitorProvide Proper Ventilation. Refer to the manual’s installation instructions fordetails on installing the

Checks and Adjustments1705A Spectrum Monitor5-15s. CHECK -- that the readout still reads 1000, ±10.t. Set SPAN/DIV to 1 MHz.u. CHECK -- that the marke

Checks and Adjustments5-161705A Spectrum Monitora. Set the UHF signal generator Frequency to 1400 MHz, and Amplitude to--60 dBm.b. CHECK -- that the t

Checks and Adjustments1705A Spectrum Monitor5-17Adjustment ProcedureThe Adjustment Procedure covers only adjustments. Checks, other than thosethat mus

Checks and Adjustments5-181705A Spectrum Monitor15. Adjust Span/Div Magnifier Range (R38 and R37)16. Adjust Intensified Zone Range (R61 and R36)17. Ad

Checks and Adjustments1705A Spectrum Monitor5-192. Adjust CRT Biasa. Turn the INTENSITY control fully counterclockwise.b. ADJUST -- R58 (CRT BIAS) so

Checks and Adjustments5-201705A Spectrum Monitor3. Adjust Geometry, Focus, and AstigmatismDisplay the DAC test pattern by completing parts a. through

Checks and Adjustments1705A Spectrum Monitor5-21b. Exit the DAC test pattern by first pressing the INPUT button to displaythe TEST menu.c. Press eithe

Checks and Adjustments5-221705A Spectrum Monitor7. Adjust Readout PositionDisplay the DAC test pattern by completing parts a. through c.a. Press both

Checks and Adjustments1705A Spectrum Monitor5-23i. Repeat part i. using 2 dB/Div if necessary.j. ADJUST -- C69 for maximum signal.k. ADJUST -- L4 for

Checks and Adjustments5-241705A Spectrum Monitorg. Set the signal generator Frequency to 5.0 MHz, and the Amplitude to+10 dBm.h. Position the first ma

1705A Spectrum MonitorxiService Safety SummaryOnly qualified personnel should perform service procedures. Read this ServiceSafety Summary and the Gene

Checks and Adjustments1705A Spectrum Monitor5-25g. ADJUST -- R51, R58, R75, R81, and R82 for a linear display with eachmarker on a g raticule mark, ±1

Checks and Adjustments5-261705A Spectrum Monitore. Turn the CENTER FREQUENCY control counterclockwise until thefrequency readout display is 1800 MHz.f

Checks and Adjustments1705A Spectrum Monitor5-27e. ADJUST -- R239 (IF AGC) for maximum signal amplitude.f. ADJUST -- R240 (RF AGC) so the signal is on

Checks and Adjustments5-281705A Spectrum Monitor

Maintenance

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - FAX 781.665.0780 - TestEquipmentDepot.com

1705A Spectrum Monitor6-1Section 6MaintenanceThis section contains instructions for preventive maintenance, diagnostics,general troubleshooting, and c

Maintenance6-21705A Spectrum Monitordetergent and water. Abrasive cleaners should not be used. If the circuit boardassemblies must be removed for clea

Maintenance1705A Spectrum Monitor6-3Observe the following precautions to avoid damage:1. Minimize handling of static-sensitive components.2. Transport

Maintenance6-41705A Spectrum Monitor.SPECTRUMDISPLAYREADOUT MODEONOFFL-BANDOFFSETL.O. HIGH>EXITUSE SPAN KEYS TO MOVE CURSOR,PRESS INPUT KEY TO SELE

Service Safety Summaryxii1705A Spectrum Monitor

Maintenance1705A Spectrum Monitor6-5selected by moving the cursor to a point adjacent to the test name and pushingthe INPUT push button.USE SPAN KEYS

Maintenance6-61705A Spectrum MonitorOnce communication with the NOVRAM is verified, the microprocessor willattempt to store data. While attempting to

Maintenance1705A Spectrum Monitor6-7PRESS [INPUT] KEY TO EXITERROR : CANNOT READ OR WRITETO 2444Figure 6-4: 1705A power up error messageWhen this mess

Maintenance6-81705A Spectrum MonitorTekREF--10--20--30--40--50--60--70LOG+fFigure 6-5: DAC check waveform used to check Focus, Astigmatism, Geometry,

Maintenance1705A Spectrum Monitor6-9Refer to the Replaceable Electrical Parts list for a complete description of eachcomponent.NOTE. Check the Change

Maintenance6-101705A Spectrum MonitorThe circuit numbers of the individual components in the parts list is made up bycombining the assembly number wit

Maintenance1705A Spectrum Monitor6-113. Determine and evaluate all trouble symptoms. This is accomplished byisolating the problem to a general area su

Maintenance6-121705A Spectrum Monitorall obvious defects. In the case of overheated components, determine andcorrect the cause of overheating before r

Maintenance1705A Spectrum Monitor6-13Table 6- 2: Power Supply Fault Symptoms (Cont.)Power Supply cycles OFF/ON Output Check (Low Volts),or High V olta

Maintenance6-141705A Spectrum MonitorCAUTION. Do not pr oceed until the drain of Q9 is near 0 V. Dangerous voltagepotentials are present in the circui

1705A Spectrum MonitorxiiiPrefaceThe information in this manual is intended for instrument operators and servicetechnicians. Operators are assumed to

Maintenance1705A Spectrum Monitor6-15b. Table 6--4 lists the signal present in a properly functioning controlcircuit.Table 6- 4: Control Circuit Test

Maintenance6-161705A Spectrum MonitorTable 6- 5: High Volts Supply Fault SymptomsSymptom ProcedureUnable to focus crt using the front-panel controlFoc

Maintenance1705A Spectrum Monitor6-17Connect the oscilloscope probe to the anode of CR5 and the probe ground toTP1. The signal should be a clipped sin

Maintenance6-181705A Spectrum MonitorCORRECTIVE MAINTENANCECAUTION. A 2% RMA flux content solder is recommended for making repairs inthis instrument.

Maintenance1705A Spectrum Monitor6-19Table 6- 7: Test Selectable ComponentsCircuit Number Nominal Value Range of Values Selection CriteriaR50R74R735.6

Maintenance6-201705A Spectrum MonitorRemove these screws in orderto remove the bezelFigure 6-8: Bezel securing screwsFor graticule light removal and r

Maintenance1705A Spectrum Monitor6-211. Remove the bezel.WARNING. The crt may retain a dangerous charge. Ground the conductor of theanode to discharge

Maintenance6-221705A Spectrum MonitorBESCHLEUNIGUNGSSPANNUNG KLEINER ALS20kVDIE IN DIESEM GERA T ENTSTEHENDERONTGENSTRAHLUNG I ST AUSREICHEND ABGESCHI

Maintenance1705A Spectrum Monitor6-23TO REMOVEFRONT PANELASSEMBLYTO REMOVEFRONT PANELASSEMBLYTO SEPARATEBOARD FROM THEFRONT PANELFigure 6-10: Screws s

Maintenance6-241705A Spectrum MonitorFRONTJ1Remove these screwsto remove A3 Main bd.Remove these screwsto remove 70MHZ Turner.Remove this nutto remove

Prefacexiv1705A Spectrum MonitorSection 7, Options, documents instrument options. The information in thissection summarizes the options. Additional de

Maintenance1705A Spectrum Monitor6-252. Remove the plugs from the following connectors: J1 to the Front-Panelboard, J4 on the Power Supply board, and

Maintenance6-261705A Spectrum MonitorFRONTJ1J3J2 J4Ground strapRemove these screws to remove this boardFigure 6-12: Removing the Power Supply board1.

Maintenance1705A Spectrum Monitor6-27REPACKAGINGIf the instrument is to be shipped to a Tektronix Service Center for service orrepair, attach a tag to

Maintenance6-281705A Spectrum Monitor3. Cushion the instrument on all sides by tightly packing dunnage or urethanefoam between the carton and the inst

Options

1705A Spectrum Monitor7-1Section 7OptionsThis section describes instrument options and customer-installable field upgradekits available for the 1705A

Options7-21705A Spectrum MonitorPlain Cabinet (1700F00) This plain, silver-grey cabinet is designed for permanentmounting. The ventilating holes in th

Replaceable Electrical Parts

Preface1705A Spectrum MonitorxvContacting TektronixPhone 1-800-833-9200*Address Tektronix, Inc.Department or name (if known)14200 SW Karl Braun DriveP

1705A Spectrum Monitor 8-1Section 8Replaceable Electrical PartsThis section contains a list of the components that are replaceable for the 1705A.Use t

Replaceable Electrical Parts8-2 1705A Spectrum MonitorColumn DescriptionsThe component circuit number appears on the diagrams and circuit boardillustr

Replaceable Electrical Parts1705A Spectrum Monitor 8-3CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURERMfr.Code.Manufacturer Address City, State, Zip Cod

Replaceable Electrical Parts8-4 1705A Spectrum MonitorMfr.Code.Manufacturer Address City, State, Zip CodeTK1345 ZMAN & ASSOCIATESTK1450 TOKYO COSM

Replaceable Electrical Parts1705A Spectrum Monitor 8-5ComponentNumberTektron ixPart Number Effective DiscontinuedName & DescriptionMfr.CodeMfr. Pa

Replaceable Electrical Parts8-6 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPart

Replaceable Electrical Parts1705A Spectrum Monitor 8-7ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPart

Replaceable Electrical Parts8-8 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPart

Replaceable Electrical Parts1705A Spectrum Monitor 8-9ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPart

Replaceable Electrical Parts8-10 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Prefacexvi1705A Spectrum Monitor

Replaceable Electrical Parts1705A Spectrum Monitor 8-11ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-12 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts1705A Spectrum Monitor 8-13ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-14 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts1705A Spectrum Monitor 8-15ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-16 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts1705A Spectrum Monitor 8-17ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-18 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts1705A Spectrum Monitor 8-19ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-20 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Introduction

Replaceable Electrical Parts1705A Spectrum Monitor 8-21ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-22 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts1705A Spectrum Monitor 8-23ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-24 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts1705A Spectrum Monitor 8-25ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-26 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts1705A Spectrum Monitor 8-27ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-28 1705A Spectrum MonitorComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts1705A Spectrum Monitor 8-29ComponentNumberMfr. PartNumberMfr.CodeName & DescriptionEffective DiscontinuedTektron ixPar

Replaceable Electrical Parts8-30 1705A Spectrum Monitor

Diagrams/Circuit Board Illustrations

9- 11705ADiagrams/Circuit Board IllustrationsSymbolsGraphic symbols and class designation letters are based on ANSI Standard Y32.2-- 1975.Logic symbol

LOW-PASSFILTER3dBPAD10.7 MHzNV-RAMDACX--AXIS+11.8 V+18VSUPPLY10 kHzRESOLUTIONFILTERGAINCONTROL--11.8 VSPANLOWVOLTAGEPOWERSUPPLYTUNERSWITCHINGVCOL--BAN

A3 Main Board Component Locator(with cross-references to schematic diagrams 1, 2, 3, 4, and 5).CompNoDiagNoDiagLocBdLocCompNoDiagNoDiagLocBdLocCompNoD

Static Sensitive DevicesSee Maintenance SectionA3 Main BoardA5 70 MHz Tuner BoardSee parts list for earier values and serial number ranges.

A3C80 C4 L1C89 C5 M1C91 F4 P5CR31 C4 M2J9 F2 K3J11 G5 M1Q20 C5 M1Q21 C4 M2Q30 D5 O6Q31 D5 O6Q32 F4 O5Q101 G5 P6R205 C4 M2R214 C4 M2R215 B4 M2R216 C4 M

12V+11.8VC1095000PFSHIELD CANREARPAN EL--- 2 5 d B m70 MHz INPUT5dBPADJ400MIXER--- 2 6 d B m --- 3 2 d B m--- 6 d B( --- 1 d B ) 3 dB PAD ---35 dBmC29

C31 G1 H2C32 H1 H2C33 G1 H3C34 H1 H3C35 H1 H4C36 E3 I2C37 B5 I3C39 F2 I1C41 E2 I1C42 E2 J1C43 F2 J2C44 C5 J3C45 C5 J3C46 B4 J4C47 B4 J4C48 D4 J4C50 D2

1705A Spectrum MonitoriTable of ContentsGeneral Safety Summary ix...Service Safety Summary xi...

1705A Spectrum Monitor1-1Section 1IntroductionThe TEKTRONIX 1705A Spectrum Monitor is an 8½” wide by 5¼” highspecial purpose spectrum analyzer. It wei

R136150.0+11.8VVISUAL AIDU25TOP VIEW7911FL2VISUALAID16TOP VIEWT1<1>G2R201267.0136--- BPFNOTE: PINS 13--- 16 ARE THE MOUNTINGPINS FOR THE PART.23

C4 F5 A4C6 F5 B3C7 B3 C2C10 F5 C3C11 F5 C4C14 G5 D2C15 G5 D4C18 G5 D3C19 F5 D3C20 B3 E6C21 D5 F3C25 H3 G3C29 H1 G3C30 H3 G3C40 B1 I6C49 A1 J5C77 G5 L6

C29.1UFR1198.25KR132200.0+40VC92430PFR304187.0K+11.8V12J101R242100.0KP101+5VH2HALFSPANR1261.00MR2431.00M12J100P100/LBAND+2V--- 2 VHALFSPANR159200.0KR1

C22 C5 G2C23 C5 G2C24 D5 G2C26 B5 G2C27 B5 G2C28 A5 G2C65 G4 K6C78 D2 L6C84 D2 M6C93 C1 K5C102 B4 I2CR9 D5 F2CR10 D5 F2CR17 B5 G2CR18 B5 G2J4 A3 H1J7

R1399.09K+11.8V2dB GAINR14050K1213146111678U21A4053+5VGAINVERTNCR18410.0KR17650KR1524.75KVPOSNFILTERLOWPASS15 KHzR21020.0KR1886.19KC93100PF+11.8VR2296

A3C1 D1 A4C2 D1 A4C3 D1 A4C5 C3 A5C8 G5 C2C9 G5 C2C12 B4 C6C13 C4 C6C16 C3 D6C17 A5 D2CR1 C3 B6J1 A2 A2J2 B5 D2J300 C2 A6J414 D5 A3P300 C2Q1 B5 D1Q2 B

100.0AD[0..7]A08031 ONLYW10OHMMICROPROCESSORY112MHZEA/VP31X119X218RESET9INT012INT113T014T115P1.01P1.12P1.23P1.34P1.45P1.56P1.67P1.78P0.039P0.138P0.237

A2DS112 A1DS112A B1DS112B A3DS112C B3DS129 B1DS129A B1DS129B B3DS129C B1DS130 B1DS144 C1DS144A C1DS144B B3DS144C C1DS145 C1DS319 A2DS319A A2DS319B B3D

FILTERRESOLUTIONFILTERVIDEO+5V21DS144ADS144RESOLUTION+5V21DS129ADS129VIDEO+5V21DS112ADS112FILTERONLED_ON+5VFILTER300 KHzFILTERRESOLUTION10 KHzINPUTLBA

A1 Power Supply Board Component Locator(with cross-references to schematic diagrams 7 and 8).CompNoDiagNoDiagLocBdLocCompNoDiagNoDiagLocBdLocCompNoDia

Introduction1-21705A Spectrum MonitorLOW-NOISE AMPLIFIER/BLOCK DO WN CONVERTER1705ASPECTRUM MONITORRECEIVERFigure 1-1: 1705A used to locate satellites

11223344556677889910101111J5CAUTION: ALL CIRCUITRY TO THEMOUNTINGLINE RECTIFIERAND FILTERL41MHLEFTOFTHEISOLATIONBOUNDARY IS AT POWER LINEPOTENTIAL AND

C1 C4 A4C2 D3 D1C3 D3 A2C4 D3 A2C5 D4 B3C6 C4 B4C7 F3 B1C8 D3 B2C9 E2 B2C10 C5 B4C11 E2 B1C12 D2 C4C13 D2 C4C14 D2 C4C15 F2 C4C16 C2 C3C17 F2 D4C18 F3

20KP320 IS PARTOF CRTV1R6122.1+100VC1910UFC2410UFC3410UFHV OSC &ERROR AMPC27.1UF23674U2741R66499K+15AC28.1UFR632.00K5.5KV P --- PR65100KR64100KC20

Replaceable Mechanical Parts

1705A Spectrum Monitor 10--1Section 10Replaceable Mechanical PartsThis section contains a list of the components that are replaceable for the 1705A.Us

Replaceable Mechanical Parts10- 2 1705A Spectrum MonitorColumn DescriptionsItems in this section are referenced by figure and index numbers to the ill

Replaceable Mechanical Parts1705A Spectrum Monitor 10- 3CROSS INDEX - MFR. CODE NUMBER TO MANUFACTURERMfr.Code.Manufacturer Address City, State, Zip C

Replaceable Mechanical Parts10- 4 1705A Spectrum MonitorFig. &IndexNo.Tektr on i xPart No.Serial NumberEffective DscontQty12345 Name & Descrip

Introduction1705A Spectrum Monitor1-3Camera, C9 (Option 20)Viewing Hood (016-0475-00)Front Panel Cover (200-3897-01)1700F00, Plain Cabinet (painted si

Replaceable Mechanical Parts1705A Spectrum Monitor 10- 5Fig. &IndexNo.Mfr. Part No.Mfr.Code12345 Name & DescriptionQtySerial NumberEffective D

Replaceable Mechanical Parts10- 6 1705A Spectrum MonitorFig. &IndexNo.Mfr. Part No.Mfr.Code12345 Name & DescriptionQtySerial NumberEffective D

1705A Spectrum MonitorFIG. 1 EXPLODED VIEWA1A3A2A3A112345678910111213141516171819202122232425262728293031A532333435A6A43637383940414243444546474849505

Introduction1-41705A Spectrum MonitorELECTRICAL SPECIFICATIONTable 1- 1: Spectrum DisplayCharacteristicPerformanceRequirementsSupplemental Information

Introduction1705A Spectrum Monitor1-5Table 1- 1: Spectrum Display (Cont.)CharacteristicCheckStepSupplemental InformationPerformanceRequirementsFrequen

Introduction1-61705A Spectrum MonitorTable 1- 4: Environmental CharacteristicsCharacteristic Supplemental InformationTemperatureNon-OperatingOperating

Introduction1705A Spectrum Monitor1-7Table 1- 6: Certifications and Compliances (cont.)FCC Compliance Emissions comply wi th FCC Code of Federal Regul

Introduction1-81705A Spectrum MonitorTable 1- 6: Certifications and Compliances (cont.)Safety Certification ComplianceTemperat ure, operating +5 to +4

Introduction1705A Spectrum Monitor1-9APPLICATIONSThe principal application for the TEKTRONIX 1705A Spectrum Monitor is toprovide a convenient method t

Introduction1-101705A Spectrum Monitororbit of the satellite. If the orbit of an equatorial orbiting satellite were roughlyequal to the distance from

Table of Contentsii1705A Spectrum MonitorVertical Scales 2--7...Horizontal Scales 2--9...

Introduction1705A Spectrum Monitor1-11NEW YORK CITYCHICAGOLOS ANGELESHONOLULUANCHORAGEGREENWICHENGLANDNORTHPOLEPRIME MERIDIAN000°INTERNATIONAL DATELIN

Introduction1-121705A Spectrum MonitorL- Band Input SignalsAt the present time there are numerous satellites in geostationary orbit. Thetransponders o

Introduction1705A Spectrum Monitor1-13Zeroing in on a SatelliteIn almost all cases a set procedure for Locating, Identifying, Finding (transpond-ers),

Introduction1-141705A Spectrum MonitorTekREF--10--20--30--40--50--60--70LOG+f12.20 GHZFigure 1-6: A computer representation of the 1705A display showi

Introduction1705A Spectrum Monitor1-1511.729GHz 11.788GHz 11.847GHz 11.906GHz 11.965GHz 12.024GHz 12.083GHz 12.142GHz11.7585GHz 11.8175GHz 11.8765GHz

Introduction1-161705A Spectrum MonitorTekREF--10--20--30--40--50--60--70LOG+f11.73 GHZ13 5 7 9111315Figure 1-8: Simulation of a 1705A FULL SPAN/DIV di

Introduction1705A Spectrum Monitor1-171705ASPECTRUM MONITORINRFOUTHPAOUTINUP CONVERTEROUTVIDEOEXCITER70 MHZINPUTDIRECTIONALCOUPLERFigure 1-9: Up link

Introduction1-181705A Spectrum Monitor1705ASPECTRUM MONITORINRFOUTHPAOUTINUP CONVERTEROUTVIDEOEXCITER70 MHZINPUTDIRECTIONALCOUPLERRECEIVERLNBL-OUTKu-I

Operating Instructions

Table of Contents1705A Spectrum MonitoriiiRamp Generator 4--7...Gain Control (SPAN/DIV) 4--7...

1705A Spectrum Monitor2-1Section 2Operating InstructionsThese instructions provide information about the front-panel controls andindicators, rear-pane

Operating Instructions2-21705A Spectrum MonitorTektronixINPUTDISPLAY1705AVIDEOONSPECTRUMMONITORPOSITION= HOLD FOR FUNCTIONFOCUS SCALE INTENSON 300 KHz

Operating Instructions1705A Spectrum Monitor2-36. SPAN/DIVTwo push-button switches (left and right) that select the calibrated span perdivision. Each

Operating Instructions2-41705A Spectrum Monitor11. HORIZONTALA variable control that positions the trace horizontally (X axis).12. VERTICALA variable

Operating Instructions1705A Spectrum Monitor2-570 MHzSPECTRUM MONITOR333--3990 --01INPUTBESCHLEUNIGUNGSSPANNUNG KLEINER ALS20kVDIE IN DIESEM GERA T EN

Operating Instructions2-61705A Spectrum MonitorPowering- upWhen the 1705A is first powered up, it should come up in a measurement mode.Most commonly i

Operating Instructions1705A Spectrum Monitor2-7Measurement GraticuleThe 1705A is equipped with an internal graticule crt. The graticule h as an 8 X10

Operating Instructions2-81705A Spectrum MonitorTable 2- 1: dB ReferenceReading in dB Voltage Ratio Power Ratio Reading in dB Voltage Ratio Power Ratio

Operating Instructions1705A Spectrum Monitor2-9Table 2- 2: dBm tov ConversionReading in dBm v(75Ω) v(50Ω) Reading in dBm v(75Ω) v(50Ω)--- 3 0 866

Operating Instructions2-101705A Spectrum MonitorSCALE = 10 DIVISIONSSWEEP LENGTH = 12 DIVISIONSMINIMUMFREQUENCYL-BAND = 900 MHz70 MHz = 45 MHzMIDFREQU

Table of Contentsiv1705A Spectrum MonitorShort--Form Procedure 5--17...Long Form Procedure 5--18...

Operating Instructions1705A Spectrum Monitor2-11TekREF--10--20--30--40--50--60--70LOG+f45MHZ95MHZ1900MHZ900MHZ50 55 60 65 70 75 80 85 901000 1100 1200

Operating Instructions2-121705A Spectrum Monitor1400 MHZTekREF--10--20--30--40--50--60--70LOG+fFigure 2-7: Center frequency cursor and readout for the

Operating Instructions1705A Spectrum Monitor2-131400 MHZPOINT ON THE TRACE THATCORRESPONDS TO 1400 MHZ.CENTER FREQUENCYTUNED AT THIS POINT.Figure 2-8:

Operating Instructions2-141705A Spectrum MonitorCustomizing Frequency ReadoutThe type and location of the readout for the TEKTRONIX 1705A SpectrumMoni

Operating Instructions1705A Spectrum Monitor2-15.SPECTRUMDISPLAYREADOUT MODEONOFFL-BANDOFFSETL.O. HIGH>EXITUSE SPAN KEYS TO MOVE CURSOR,PRESS INPUT

Operating Instructions2-161705A Spectrum Monitortransponder frequency. Changing the readout to reflect these frequencies iseasily accomplished by sele

Operating Instructions1705A Spectrum Monitor2-17ments the frequency readout (low to high) and moves the brightened portion ofthe sweep from left to ri

Operating Instructions2-181705A Spectrum Monitor2. Stabilize the vehicle in a location where there will be a clear path betweenthe antenna and the sat

Operating Instructions1705A Spectrum Monitor2-19Table 2- 3: Azimuth / Elevation Table for 21 CONUS Cities (Cont.)Salt Lake City 137˚ 34˚ 169˚ 42˚ 155˚

Operating Instructions2-201705A Spectrum Monitorsystems are single polarization receive to avoid the possibility of nulling thewrong polarization. If

Table of Contents1705A Spectrum MonitorvReplaceable Electrical PartsSection 8 Replaceable Electrical Parts 8--1...Part

The following servicing instructions are for use only by qualified personnel. Toavoid injury, do not perform any servicing other than that stated in t

Installation

1705A Spectrum Monitor3-1Section 3InstallationThe shipping carton and pads provide protection for the instrument duringtransit, and should be retained

Installation3-21705A Spectrum MonitorL BANDINPUTLNB POWERONLNB POWEROFF+18 VDC @ 250 mAONFigure 3-1: L-BAND INPUT connector and controlsUnder extreme

Installation1705A Spectrum Monitor3-3All qualification testing for the 1705A was performed with a 1700F00 cabinetinstalled. See Figure 3-2. To guarant

Installation3-41705A Spectrum MonitorTop410.97 mm(16.180 in)126.49 mm(4.980 in)Rear209.55 mm(8.250 in)174.63 mm(6.875 in)17.48 mm(0.688 in)14.00 mm(0.

Installation1705A Spectrum Monitor3-5LNB POWER70 MHzSPECTRUM MONITOR333--3990 --01INPUTBESCHLEUNIGUNGSSPANNUNGKLEINER ALS20kVDIE IN D IESEM GERAT EN T

Installation3-61705A Spectrum Monitor18.9705.25017.270Controls front panelto rack alignmentRear view6.875MountingholesFigure 3-5: The WFM7F05 side-by-

Table of Contentsvi1705A Spectrum MonitorList of FiguresFigure 1-1: 1705A used to locate satellites and determine maximum signal level 1--2...Fi

Installation1705A Spectrum Monitor3-7If only one side of the rack adapter is used, a 1700F06 Blank Panel can beinserted in the unused section. See Fig

Installation3-81705A Spectrum MonitorFor applications such as consoles, shown in Figure 3-8, the instrument can bemounted with front molding flush or

Theory of Operation

1705A Spectrum Monitor4-1Section 4Theory of OperationThe material in this section is subdivided into a general description (which issupported by the m

Theory of Operation4-21705A Spectrum Monitordriven with a pre-corrected sweep ramp. Pre-correction is required to make upfor the inherent VCO nonlinea

Theory of Operation1705A Spectrum Monitor4-3bright-up signal, centered around the center frequency, is generated for theZ--Axis Control circuit by the

Theory of Operation4-41705A Spectrum Monitorregulated to become the + and --11.8 V supplies on the Main circuit board(regulator circuits are on Diagra

Theory of Operation1705A Spectrum Monitor4-5by a 7-pole, 120 MHz, low-pass filter that rejects out-of-band frequencies. TheMixer, U190, with input fre

Theory of Operation4-61705A Spectrum MonitorDBM U28 is driven by the L--Band Tuner output at 489.9 MHz through aLPF/Notch filter consisting of L11, L1

Table of Contents1705A Spectrum MonitorviiFigure 3-8: Considerations for custom installation of an instrument 3--8...Figure 4-1: 1705

Theory of Operation1705A Spectrum Monitor4-7Sweep GeneratorDiagram 3This schematic contains the free--running Ramp Generator, Switchable GainControl (

Theory of Operation4-81705A Spectrum MonitorSTARTOFDISPLAYR727 R729R737R733R731 R735Figure 4-1: 1705A L- Band comb display showing the areas each of t

Theory of Operation1705A Spectrum Monitor4-9conditions the output goes toward the positive supply. If the input is between +and --0.7 V, neither diode

Theory of Operation4-101705A Spectrum Monitorcontrol into the summing junction of U27 (pin 2). The Vertical Position controlis attenuated by resistors

Theory of Operation1705A Spectrum Monitor4-11MicroprocessorDiagram 5The 1705A is a microprocessor-controlled instrument. Circuitry on Diagram 5shows t

Theory of Operation4-121705A Spectrum MonitorU6 is an 8-bit D-type data latch that drives all the front-panel LEDs and most ofthe internal control lin

Theory of Operation1705A Spectrum Monitor4-13The +18 V supply is of the Buck-Regulator type. It uses a Switched ModePower Supply Control Circuit, U583

Theory of Operation4-141705A Spectrum Monitorinternal pulse width modulator. Q588 is the current sense, sampling currentacross R 690 to provide a volt

Theory of Operation1705A Spectrum Monitor4-15The input line voltage is filtered by the rear-panel connector to reduce theelectrical noise conducted in

Theory of Operation4-161705A Spectrum Monitorincreases, causing the voltage across R96 to increase. This voltage is divided byR87 and R101, and is app

Table of Contentsviii1705A Spectrum MonitorList of TablesTable 1--1: Spectrum Display 1--4...Table 1--2:

Theory of Operation1705A Spectrum Monitor4-17High Voltage Power SupplyDiagram 8The High Voltage Power Supply generates the heater, cathode, control gr

Theory of Operation4-181705A Spectrum MonitorCR4 is the high voltage rectifier. Filter capacitors C3, C4, and C8 work withCR4 to provide --2530 V to t

Theory of Operation1705A Spectrum Monitor4-19Q5 is a current amplifier feeding the output stage. Q3 and Q4 form a push-pulloutput stage. Q3 acts as a

Theory of Operation4-201705A Spectrum Monitor

Checks and Adjustments

1705A Spectrum Monitor5-1Section 5Checks And AdjustmentsThis section consists of two separate procedures. The first, a PerformanceCheck, is used to de

Checks and Adjustments5-21705A Spectrum Monitor2. Leveled Sine Wave Generator, at least 250 kHz to 95 MHz.For example: A TEKTRONIX SG503 Leveled Sine

Checks and Adjustments1705A Spectrum Monitor5-311. SMA Male-to-bnc Female AdapterTwo required (supplied with the Tektronix Comb Generator).For example

Checks and Adjustments5-41705A Spectrum Monitor6. Check Resolution Filterb. CHECK -- that the marker width 0.6 Divisions down from the top is3 Divisio