1705A Spectrum Monitor SN B040000 and Above 070-8222-08
Table of Contents
Theory of Operation
Installation
Table of Contents
1705A Spectrum Monitor Iii
Checks and Adjustments
Options
Maintenance
Replaceable Mechanical Parts 10-1
Replaceable Electrical Parts
Replaceable Electrical Parts
Simulation of a 1705A Full SPAN/DIV display
List of Figures
1705A Spectrum Monitor Vii
Considerations for custom installation of an instrument
Viii
List of Tables
General Safety Summary
General Safety Summary
Service Safety Summary
Service Safety Summary Xii
Introduction
Installation
Preface
Replaceable Mechanical Parts
USA
Contacting Tektronix
Preface
Preface Xvi
Introduction
Page
Section Introduction
Typical Configurations
Options
Accessories
Introduction
#73
Optional Accessories
Safety Information
Full
Spectrum Display
SPAN/DIV
CRT Display
Power Source
Introduction Spectrum Display
Physical Characteristics
Introduction Environmental Characteristics
Certifications and Compliances
EMC
CAT
Introduction Certifications and Compliances
Meters
Applications
Earth
SUN Satellite
Using the 1705A for Satellite Communication
Vancouver BC Seattle Portland Helena Boise SAN Francisco
Band Input Signals
LOS Angeles
SAN Diego
Zeroing in on a Satellite
Tek 12.20 GHZ
Frequency and Number Down Link Transponder
Horizontal Vertical Polarization
GHZ
Looking at Exciters with the 70 MHz Input
Miscellaneous Uses for the 1705A
Band
LNB OUT
Splitter
Input
Operating Instructions
Page
Section Operating Instructions
Front-panel Controls and Indicators
Operating Instructions
Position Power
Filter Input
Display
SPAN/DIV
Variable control that adjusts the display brightness
Position
Rear- Panel Connectors
Spectrum Monitor
Holder for the instrument’s mains fuse
1400 MHZ
Powering- up
1705A graticule scale
Measurement Graticule
Voltage Ratio Power Ratio
Reading in dB Voltage Ratio Power Ratio
Operating Instructions DB Reference
Reading in dB
Operating Instructions DBm to v Conversion Reading in dBm
75Ω 50Ω
Frequency Scale = 10 Divisions Sweep Length = 12 Divisions
Minimum Maximum Frequency
MID
MHZ
Center Frequency Readout
70 MHZ
1400 MHZ
Center Frequency Tuned AT this Point
Point on Trace That Corresponds to
Customizing Frequency Readout
Offset Adjust
Readout Mode
Main Menu
Readout Position
12.00 GHZ
Locating Ku- Band Satellites
Basic Operating Procedure
Satcom K2 G-STAR
City
1705A Spectrum Monitor
Operating Instructions
Page
Page
Installation
Page
Electrical Installation
Section Installation
Installation
Mechanical Installation
LNB Power Band Input OFF
Cabinet Options
875
250
105
130
Cabinetizing
1700F02 portable cabinet dimensions
Cabinet Securing Screws
A WFM7F05 with a blank front panel 1700F06
1700F07
1705A Spectrum Monitor
Theory of Operation
Page
Overview
Block Diagram
Section Theory of Operation
Theory of Operation
Front Panel Diagram
RF Input Diagram
If Amplifier Diagram
Resolution Filter and Log Detector
Sweep Generator Diagram
Start Display
Deflection Amplifiers Diagram
Vertical Deflection Amplifier
Microprocessor Diagram
Front Panel Diagram
High Load
LOW Load Average
Low Voltage Power Supply Diagram
Pulse Width Modulator
Theory of Operation
High Voltage Power Supply Diagram
Axis Amplifier
Pinout of the CRT Socket 1705A Spectrum Monitor
CRT The pinout for the CRT is shown in Figure
Theory of Operation
Checks and Adjustments
Page
Electrical Instruments
Section Checks And Adjustments
Recommended Equipment List
Auxiliary Equipment
Performance Check
Short-Form Procedure
Checks and Adjustments SMA Male-to-bnc Female Adapter
1705A Spectrum Monitor
Long Form Procedure
Checks and Adjustments Preliminary Control Settings
Page
Marker Here Marker is +/-- 1 Minor Division from Here
Checks and Adjustments
1705A Spectrum Monitor
Page
Variable Autotransformer L-BAND Input
Marker Here Graticule Line
Disregard
UHF Sine Wave Generator
Page
End of the Performance Check Procedure
Short- Form Procedure
Adjustment Procedure
Video SPAN/DIV Full Center Frequency
Preliminary Setup
A1 PWR Sply BD
A3 Main BD
Front
Tek
Strap
Remove the shorting strap 1705A Spectrum Monitor
Shorting
1705A Spectrum Monitor
Page
1705A Spectrum Monitor
Page
1705A Spectrum Monitor
End of Adjustment Procedure
Checks and Adjustments
Maintenance
Page
Cleaning
Section Maintenance
LOW Power Schott
Schottky Signal
Cmos
ECL
Troubleshooting
Diagnostic Routines
Nonvolatile 2444 RAM Test
Reading Data Stored AT 60H to 7F in Processor
Error Cannot Read or Write Press Input KEY to Exit
Troubleshooting Aids
Circuit board assembly locations
Major Assembly Interconnection
PIN
ROW B ROW a
Power Supply Fault Symptoms
Power Supply Troubleshooting Procedure
Low Volts Supply
Maintenance Power Supply Fault Symptoms
Maintenance Rectifier/Switcher Check
High Volts Supply
Focus Amplifier Check
Maintenance High Volts Supply Fault Symptoms
Axis Amplifier Check
Grid Drive Check
CRT Voltage Check
High Voltage Oscillator Check
Obtaining Replacement Parts
Corrective Maintenance
Bezel Removal
Mechanical Disassembly/Assembly
Maintenance Test Selectable Components
Graticule Light Removal and Replacement
Replacing the CRT
Removal of the CRT
Removal of the Rear Panel
Removal of Front- Panel Assembly
Removing the L- Band Tuner
Removal Replacement of the Main Board
Removal Replacement of the Power Supply Board
Front
Removing the LNB Power Supply Board
Repackaging
1705A Spectrum Monitor
Options
Page
Power Cord Options
Field Upgrade Kits
Power Cord Options Description of power cord
Section Options
Ordering
Replaceable Electrical Parts
Page
Parts Ordering Information
Using the Replaceable Electrical Parts List
Section Replaceable Electrical Parts
Tektronix Part No
Column Descriptions
Column
Column 3
Cross Index MFR. Code Number to Manufacturer
Spectrum Control INC Weight ST
AMP INC Fulling Mill Harrisburg PA
MSD INC Orange ST DARLINGTON, SC
Sobudai Zawa Kanagawa 228 Japan
Zman & Associates
Chrome Shibaura Tokyo Japan 2ND Floor NEW Kyoei MINATO-KU
Wilhelm Westerman
Circuit BD ASSY18V Power Supply
Circuit BD Assypower SUPPLY, 1705A
Circuit BD Assyfront Panel
Circuit BD Assymain Board ASSY,1705A
CAP,FXD,PLSTC100PF,5%,1600VDC/500VAC
IAL,MI
IN,BULK
CAP,FXD,CER DI470PF,20%,100V TUBULAR,MI
A1DS1
LAMP,GLOW135V MAX,1.9MA,C2A-T,WIRE Lead
A1DS2
A1DS3
SQ,SIDE ADJUSTT&R
SQ,TOP Adjustbulk
RES,FXD,CMPSN1.5M OHM,5%,1W
RES,FXD,CMPSN2.2M OHM,5%,0.5W
IAL,T&R,SMALL Body
RES,FXD,FILM5K OHM,0.1%,0.2W,TC=T9
REELED,SMALL Body
RES,FXDMETAL FILM,100K OHM,1%,0.2W,TC=100
WIRED,1705A
SQ,TOP ADJUST,T&R
RES,THERMAL5 OHM,10%,7A/DEG C
RES,FXD,CMPSN2.4K OHM,5%,2W
Part of A2DS313
LED ASSYDIR1
CA ASSY,SP,ELEC34,26 AWG,5.0 L
RES,VAR,PNLCP,20K OHM,20%,0.5W,LINEAR,W
PLATE,ELEC Shldcircuit Board
BUS,CNDCT
SHIELD,ELECCIRCUIT Board
SHIELD,ELEC1705A,BRS
UVX1H330MAA
CAP,FXD,ELCTLT33UF,+50-20%,35WVDC
CAP,VAR,CER DI9-45PF,200V
CAP,VAR,PLSTC1-3.5PF,500V
A3CR1
CAP,FXD,MICA DI98PF,5%,500V
A3CR2
DIO,SIGFAST RCVRY70V,200MA,100NS,COM
FLTR,BANDPASS
A3FL1
A3FL2
A3FL3
COIL,RFFIXED,15NH
COIL,RFFIXED,45NH
COIL,RFFIXED,64UH
COIL,RFFIXED,505NH
RES NTWK,FXD,FI10K OHM,20%,9RES
ADJUSTT&R
GF06UT 2K
GF06UT 5K
RES,FXD,FILM3.4K OHM,1%,0.2W,TC=T0
RES,FXD,FILM115K OHM,1%,0.2W,TC=T0
RES,FXD,FILM237K OHM,1%,0.2W,TC=T0
RES,VAR,NONWWTRMR,250 OHM,20%,0.5W LIN
RES,FXD,FILM7.5K OHM,1%,0.2W,TC=T0
Percent
RES,FXD,FILM1M OHM.1%,0.2W,TC=T0
CRB20FXE1K62
CRB20FXE9K35
RES,VAR,NONWWTRMR,100 OHM,20%,0.5W LIN
RES,FXD,FILM2.1K OHM,1%,0.2W,TC=T0
RES,FXD,WW6.3K OHM,1%,3W
CRB20FXE210E
GF06UT 1K
Loss 10DB,PKG 7.2MM SQ,6.8MM HI
RES,FXD,FILM187K OHM,1%,0.2W,TC=T0
IC,CONVCMOS,A/D8-BIT,32US,SAR,DIFF IN,SER
MICROCKT,DGTLMICROCOMPUTER,8 BIT
IC,LINBIPOLAR,AMPLRF AMP,20DB
IC,MISCCMOS,ANALOG Swquad SPST,100
IC,DGTLTTL,BFR/DRVRHEX INV, OC, HI
MIXER,FREQ1-500MHZ
CTR,0.385 H,30 GLD,BLK,JUMPER
CONN,BOXSHUNT/SHORTINGFEM,STR,1 X 2,0.1
TAIL,30 GLD
IAL,MI,T&R
RES,FXD,WW1 OHM,5%,2W
RES,FXD,FILM267K OHM,1%,0.2W,TC=T0
Order by Desc
RES,FXD,CMPSN1K OHM,5%,0.50W
CONN,HDRPCB/WIREWRAP,MALE,STR,1 X 4,0.150
CONN,HDRPCB/WIREWRAP,MALE,STR,1 X 7,0.15
CORE,EMTOROID,FERRITE
COIL,RFFIXED,150NH
Controlled 0LUA3
A10SKT1
CONN,RF Plug
CA ASSY,SP
Replaceable Electrical Parts
Diagrams/Circuit Board Illustrations
Page
Symbols
Diagrams/Circuit Board Illustrations
Assembly Numbers
Component Values
Page
1705A Spectrum Monitor
A3 Main Board Component Locator
With cross-references to schematic diagrams 1, 2, 3, 4,
A5 70 MHz Tuner Board
A3 Main Board
Schematic Diagram 1 Component Locator Chart
1705A Spectrum Monitor RF Input
Local Oscillator
Schematic Diagram 2 Component Locator Chart
1705A Spectrum Monitor If Amplifier
Resolution Filter & LOG Detector
Schematic Diagram 3 Component Locator Chart
Ramp Generator
Band Linearity
Marker
Generator
Schematic Diagram 4 Component Locator Chart
Amplifier
Deflection
Filter
Buffers
Schematic Diagram 5 Component Locator Chart
Microprocessor
1705A Spectrum Monitor
Microprocessor
Trace
Schematic Diagram 6 Component Locator Chart
A2 Front Panel Board
1705A Spectrum Monitor Front Panel & 18V Supply
See Parts List for Effective Serial Number Ranges
A1 Power Supply Board
A1 Power Supply Board Component Locator
Error
Switcher
Line Rectifier
Output Filters
A10 CRT Socket Board Front of Board
Schematic Diagram 8 Component Locator Chart
1705A Spectrum Monitor High Volts Power Supply
Error AMP
HV OSC
Grid Drive
Page
Replaceable Mechanical Parts
Page
Section Replaceable Mechanical Parts
Using the Replaceable Mechanical Parts List
Replaceable Mechanical Parts
Qty Column
This indicates the quantity of mechanical parts used
Indicates actual manufacturer’s part number
Richco
Panduit Corp Ridgeland
CHICAGO, IL
Nelson Name Plate CO Casitas
COVER,HOUSINGALUMINUM
Circuit BD Assypower Supply See A1 Repl Mounting Parts
FRAME,CRTBEZEL
SCREW,MACHINE6-32 X 0.875,PNH,SST
FRAME,CHASSISSAFETY Controlled
HOUSING,CKT Bdaluminum
SCREW,MACHINE6-32 X 0.188,PNH,STL
IN/OUT See A6 Repl Mounting Parts
CLAMP,LOOP0.375 ID,PLASTIC,SAFETY CON Trolled
Standard Accessories
Standard only Optional Accessories
CA ASSY,CRTDISCRETE,ANODE LEAD,CRT,1,22
A10
