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Comtech EF Data DT-4572 Installation And Operation Manual

X-band down converter
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DT-4572
X-Band Down Converter
Installation and Operation Manual
Part Number MN/DT4572.IOM
Rev. 0

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Summary of Contents for Comtech EF Data DT-4572

  • Page 1 DT-4572 X-Band Down Converter Installation and Operation Manual Part Number MN/DT4572.IOM Rev. 0...
  • Page 3 Errata A Comtech EF Data Documentation Update Subject: Changes to Table 1. DT-4572 X-Band Down Converter Specifications Date: January 31, 2003 Document: DT4572 X-Band Down Converter, Installation and Operation Manual, Rev. 0, dated Nov. 21, 2002 Part Number: MN/DT4572EA0.DOC Collating Instructions: Attach this page to page 3.
  • Page 5 Errata B Comtech EF Data Documentation Update Subject: Revise 2.4.4, Summary Fault Output (Relay), Connector P1 Date: March 11, 2005 Document: DT4572 X-Band Down Converter, Installation and Operation Manual, Rev. 0, dated Nov. 21, 2002 Part Number: MN/DT4572EB0.DOC Collating Instructions: Attach this page to page 12.
  • Page 7 Installation and Operation Manual Registered Company. Part Number MN/DT4572.IOM Rev. 0 November 21, 2002 Copyright © Comtech EF Data, 2002. All rights reserved. Printed in the USA. Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: 480.333.2161.

  • Page 8: Customer Support

    E-Mail can be sent to the Customer Support Department at: service@comtechefdata.com Contact us via the web at www.comtechefdata.com. To return a Comtech EF Data product (in-warranty and out-of-warranty) for repair or replacement: 1. Request a Return Material Authorization (RMA) number from the Comtech EF Data Customer Support Department.

  • Page 9: Table Of Contents

    INTRODUCTION..................1 1.1 Overview ..........................1 1.2 Functional Description ......................1 1.3 Specifications ........................... 3 1.3.1 Dimensional Envelope (DT-4572)..................6 1.4 Physical Configuration ......................7 1.5 Front Panel Display ........................ 8 1.6 Front Panel Test Point Samples..................... 8 1.7 Prime Power Switch........................ 8...
  • Page 10 DT4572 X-Band Down Converter Rev. 0 Preface MM/DT4572.IOM CHAPTER 2. INSTALLATION ..................9 2.1 Unpacking and Inspection...................... 9 2.2 Rack Mount Installation......................9 2.3 Prime Power Connection...................... 10 2.4 Cable Connections ........................ 10 2.4.1 Rear Panel Connections ....................10 2.4.2 EIA-485/EIA-232C Interface (COM 1), Connector J1............ 11 2.4.3 High Speed Bus (HSB), Connector J3................
  • Page 11 DT4572 X-Band Down Converter Rev. 0 Preface MM/DT4572.IOM A.4.5 Redundancy Systems - Converter Removal..............44 APPENDIX B. REMOTE CONTROL................47 B.1 General ..........................47 B.2 Protocol ..........................48 B.2.1 Transmission Mode ......................48 B.2.2 Baud Rate ........................48 B.2.3 Format ..........................48 B.2.4 Character Set ........................
  • Page 12 DT4572 X-Band Down Converter Rev. 0 Preface MM/DT4572.IOM C.1 Applications .......................... 71 C.2 RF Signal Conversion ......................72 C.3 Monitor & Control....................... 74 C.4 Installation, Operation and Maintenance................74 APPENDIX D. MAINTENANCE AND TROUBLESHOOTING ........75 D.1 Overview ..........................75 D.2 Maintenance Testing......................

  • Page 13: Figures

    Figure 31. Converter #1 in MANUAL, Others in AUTO............42 Figure 32. Forced BU of Converter #1 ..................43 Figure 33. Typical Converter Functional Block Diagram (Model DT-4572 shown) ....73 Figure 34. Converter Signal and Interconnecting Cable Diagram (with TSM Switching Module)
  • Page 14 Rev. 0 Preface MM/DT4572.IOM Tables Table 1. DT-4572 X-Band Down Converter Specifications............3 Table 2. Rear Panel Connectors....................10 Table 3. J1, 2 Wire EIA-485 Interface Pin-Out ................11 Table 4. J1, 4 Wire EIA-485 Interface Pin-Out ................11 Table 5. J1, EIA-232C Interface Pin-Out ................... 11 Table 6.

  • Page 15: About This Manual

    MM/DT4572.IOM BOUT THIS ANUAL This manual provides installation and operation information for the Comtech EF Data DT4572 X-Band Down Converter. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the DT4572 X-Band Down Converter.

  • Page 16: Emc Compliance

    DT4572 X-Band Down Converter Rev. 0 Preface MM/DT4572.IOM EMC C OMPLIANCE This is a Class A product. In a domestic environment, it may cause radio interference that requires the user to take adequate protection measures. EN55022 C OMPLIANCE This equipment meets the radio disturbance characteristic specifications for information technology equipment as defined in EN55022.

  • Page 17: Safety Compliance

    DT4572 X-Band Down Converter Rev. 0 Preface MM/DT4572.IOM AFETY OMPLIANCE EN 60950 Applicable testing is routinely performed as a condition of manufacturing on all units to ensure compliance with safety requirements of EN60950. This equipment meets the Safety of Information Technology Equipment specification as defined in EN60950.

  • Page 18: Warranty Policy

    For equipment under warranty, the customer is responsible for freight to Comtech EF Data and all related custom, taxes, tariffs, insurance, etc. Comtech EF Data is responsible for the freight charges only for return of the equipment from the factory to the customer.

  • Page 19: Chapter 1. Introduction

    1.2 F UNCTIONAL ESCRIPTION The DT-4572 Down Converter are designed for use in communication systems, or in satellite up-link data systems, for the transmission of SCPC, DAMA and TDMA communication signals. The Down Converters can also be used in communications system applications with full transponder HDTV and analog TV.

  • Page 20: Figure 1. Front Panel (Model Dt-4572 Shown)

    Figure 2. Rear Panel (shown with RSM Module) IF OUTPUT RF INPUT I/O MODULE (70 or 140 MHz) (7250-7750 MHz) MONITOR & CONVERTER CONTROL SIGNAL PATH MODULE 5/10 MHz SYNTHESIZER OSC. REF. OSC. POWER SUPPLY Figure 3. Typical Functional Block Diagram (DT-4572 Shown)

  • Page 21: Specifications

    DT4572 X-Band Down Converter Rev. 0 Introduction MM/DT4572.IOM 1.3 S PECIFICATIONS Table 1. DT-4572 X-Band Down Converter Specifications Characteristic Specification RF Input Frequency Range 7250 to 7750 MHz Conversion Dual, No Inversion Step Size 1 kHz standard Preset Channels 32 Frequencies Stability Over Time ±...
  • Page 22 DT4572 X-Band Down Converter Rev. 0 Introduction MM/DT4572.IOM Characteristic Specification Group Delay Linear Group Delay 0.03 ns/MHz Parabolic Delay 0.01 ns/MHz2 Group Delay Ripple 1.0 ns Peak-to-Peak Phase Noise Limit (dBc/Hz) Typical (dBc/Hz) 100 Hz 1 KHz 10 KHz 100 KHz -100 -102 1 MHz...
  • Page 23 DT4572 X-Band Down Converter Rev. 0 Introduction MM/DT4572.IOM Characteristic Specification Physical Width 19 Inches (48.26 cm) Height 1.75 Inches (4.44 cm) Depth 22 Inches (55.90 cm) Weight 15 Pounds (7.00 kg) MTBF 49,740 hrs. (calculated) >100,000 hrs. (field experience) Summary Alarm Relay Closure Form C...

  • Page 24: Dimensional Envelope (Dt-4572)

    (DT-4572) IMENSIONAL NVELOPE Dimensions are shown in both inches and centimeters. 17.00 (432) 22.00 (55.9) SAMPLE STATUS POWER ON ON LINE 1.75” TRANSMIT FAULT (4.45) DT-4572 REMOTE STORED FAULT DOWN CONVERTER 18.25 (46.35) 19.0 (48.3) Figure 4. DT-4572 Dimensional Envelope...

  • Page 25: Physical Configuration

    1.4 P HYSICAL ONFIGURATION Figure 5 is a top view layout of a DT-4572 Series Down Converter chassis with the cover removed. Major chassis components are shown in Figure 5. The major module assemblies shown in the layout are: Signal Path Module Step Loop Module Monitor &...

  • Page 26: Front Panel Display

    DT4572 X-Band Down Converter Rev. 0 Introduction MM/DT4572.IOM 1.5 F RONT ANEL ISPLAY The front panel display is a two line, 24-character, LCD display. Each configuration function, or operating mode, is shown on the display when the operator enters a command into the key-pad on the front panel.

  • Page 27: Chapter 2. Installation

    Adequate air ventilation should be provided on both sides of the rack mounted equipment. If the converter is to be mounted on slides, the slides must be the Comtech EF Data rack slides provided with the converter. Mount the slides on the sides of the converter chassis with the mounting hardware provided.

  • Page 28: Prime Power Connection

    DT4572 X-Band Down Converter Rev. 0 Installation MM/DT4572.IOM 2.3 P RIME OWER ONNECTION The detachable power cord mates with the AC Prime power receptacle on the rear of the converter chassis. A power cord for connection to 90 to 125 VAC, or 205 to 240 VAC, power sources is provided with the converter.

  • Page 29: Eia-485/Eia-232C Interface (Com 1), Connector J1

    DT4572 X-Band Down Converter Rev. 0 Installation MM/DT4572.IOM 2.4.2 EIA-485/EIA-232C I (COM 1), C NTERFACE ONNECTOR The EIA-485/EIA-232C Interface connector, J1, is 9 pin "D" type DB9F connector socket. The pin-out specifications for EIA-485 are contained in Table 3 and Table 4. The specification for EIA-232C is contained in Table 5.

  • Page 30: High Speed Bus (Hsb), Connector J3

    The High Speed Bus connector, J3, is 25 pin "D" type DB25F connector socket. The pin- out specifications is contained in Table 6. The mating connector is a DB25M. Note: This is not a “straight through” cable assembly. Contact Comtech EF Data for detailed wire drawings when cabling between converters.

  • Page 31: Cable Connections For Non-Redundant System Operation

    DT4572 X-Band Down Converter Rev. 0 Installation MM/DT4572.IOM Prime Power Cord Input 5/10 MHz Ref. Osc. Input Reference Power Oscillator Fine Supply Step Summary Fault Relay Output Module Serial Comm. Interface (RS-485 / RS-232C)- COM 1 Monitor & Control Assembly High Speed Bus (HSB) IF Ouput (IF) IF Loop Input (LP IN)

  • Page 32: Figure 7. Non-Redundant Converter Configuration

    DT4572 X-Band Down Converter Rev. 0 Installation MM/DT4572.IOM IOM-XX J3 HSB OUTPUT INPUT CONNECTION Figure 7. Non-Redundant Converter Configuration RSM-XX J3 HSB LP IN LP OUT IF OUTPUT RF INPUT CONNECTION DOWN CONVERTER - RSM RF INPUT IF OUTPUT Figure 8. Non-Redundant Converter Configuration With Receive Switch Module (RSM-XX) Installed...

  • Page 33: Chapter 3. System Operation

    The front and rear panels are shown below. Table 8 lists of the operating functions for the key-pad, LCD display, LED indicators and test sample connections on the front panel. Figure 9. Front Panel (Model DT-4572 shown) P1 RELAY J1 COM 1...

  • Page 34: Table 8. Operating Functions - Front Panel

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM Table 8. Operating Functions – Front Panel Item Reference Designation Functional Description Enter key Enters commands into the converter. Clear key Clears commands and data selected and not entered. Right Arrow key Selects functions and the menu operating data.

  • Page 35: Switching Power On

    POWER ON LED STATUS indicator light is on. After the AC power is switched on and before pressing the buttons on the key-pad, the LCD display message should be similar to: DT-4572 SW VER 4.06 SN4572XXXX 3.3 O...

  • Page 36: Figure 12. Converter Operating Command Functions

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM --------DT-4572-------- -SOFTWARE VERSION-4.06- ---------SELECT--------- ----CONFIGURATION-MENU-- ---------SELECT--------- ----PRE-SELECT MENU----- ---------SELECT--------- --MONITOR-STATUS-MENU--- ---------SELECT--------- --CURRENT-FAULTS-MENU--- ---------SELECT--------- ---STORED-FAULTS-MENU--- KEY-PAD LEGEND ---------SELECT--------- DISPLAY -UTILITY-FUNCTIONS-MENU- ---------SELECT--------- --MONITOR-STATUS-MENU--- Figure 12. Converter Operating Command Functions...

  • Page 37: Figure 13. Configuration Menu Commands - Redundancy Off

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM ---------SELECT--------- ---CONFIGURATION-MENU--- ENTER FREQ= 72XX.XXX-MHz----- ATTN=-10.00-DB---Rx=OFF- ----EXTERNAL-5-MHz------ * Displayed only when there is --REFERENCE-PRESENT----- a 5/10 MHz reference input. --ENTRY-MODE-=-REMOTE--- -COLD-START-=-DISABLED-- KEY-PAD LEGEND FAULT RECOVERY:-MANUAL-- ------------------------ DISPLAY REDUNDANCY-CONFIG?-OFF-- ---------SELECT--------- ------------------------ --MONITOR-STATUS-MENU--- Figure 13.

  • Page 38: Figure 14. Configuration Menu Commands - Redundancy On, Backup Unit Not Selected

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM ---------SELECT--------- ----CONFIGURATION-MENU-- ENTER FREQ= 72XX.XXX-MHz------ ATTN=-10.00-DB---Rx=OFF- ** Manual when “Redundancy Config ON” and not in “BU” ----EXTERNAL-5-MHz------ * Displayed only when there is --REFERENCE-PRESENT----- a 5/10 MHz reference input. --ENTRY-MODE-=-REMOTE--- -COLD-START-=-DISABLED-- FAULT RECOVERY:-MANUAL-- ------------------------ ENT + DOWN + ENT...

  • Page 39: Figure 15. Configuration Menu Commands - Redundancy On And Backup Unit Selected

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM ---------SELECT--------- ----CONFIGURATION-MENU-- ENTER FREQ= 72XX.XXX-MHz------ ATTN=-10.00-DB---Rx=OFF- REDUNDANCY-CONFIG?-ON--- -CONVERTER-#-01--------- * Displayed only ----EXTERNAL-5-MHz------ when there is a 5/10 MHz ENT + RIGHT+UP . . . +UP + ENT --REFERENCE-PRESENT----- reference input. REDUNDANCY-CONFIG?-ON--- --ENTRY-MODE-=-REMOTE--- -CONVERTER-#-BU---1:03-- -COLD-START-=-DISABLED--...

  • Page 40: Figure 16. Pre-Select Menu Commands

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM ---------SELECT--------- -----PRE-SELECT-MENU---- ENTER -DISPLAY-PRE-SELECT-XX-- XXXXX.XXX-MHz--XX.XX--DB -CONFIGURE-CONVERTER-TO- -----PRE-SELECT?-XX----- LEGEND KEY-PAD -PROGRAM-PRE-SELECT-XX-- XXXX.XXX-MHZ---XX.XX-DB- DISPLAY ----CLEAR-DATA-FROM----- ---------SELECT--------- -----PRE-SELECT?-XX----- --MONITOR-STATUS-MENU--- Figure 16. Pre-Select Menu Commands ---------SELECT--------- ---MONITOR-STATUS-MENU-- ENTER 15VDC=-15.6--14VDC=-14.0 -VCC-=5.0---5VDis-=-4.0- KEY-PAD LEGEND --CONVERTER-TEMP-=-+50C- --IFLO-TUNING-=-X.X-V--- DISPLAY SYNTH.-TUNING-=-X.X-V--- ---------SELECT--------- --COARSE=X.XX-FINE=X.XX-...

  • Page 41: Figure 18. Current Faults Menu Commands

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM ---------SELECT--------- ---CURRENT-FAULTS-MENU-- ENTER ------POWER-FAULTS------ 15VDC=OK-14VDC-OK-VCC=OK -INFO-LOCK-DETECT-=-OK-- REFERENCE-LOCK-DET-=-OK- KEY-PAD LEGEND SYNTH-FAULTS:-SUM-LD=OK- FINE-LD=OK--COARSE-LD=OK DISPLAY -CONV-TEMPERATURE-=-OK-- ---------SELECT--------- --HIGH-SPEED-BUS-=-OK--- --MONITOR-STATUS-MENU--- Figure 18. Current Faults Menu Commands KEY-PAD LEGEND ---------SELECT--------- ---STORED-FAULTS-MENU--- ENTER DISPLAY ---------SELECT--------- --MONITOR-STATUS-MENU--- TOTAL-FAULTS-STORED:--XX LAST-19:20:05---05/19/02 ----CLEAR-ALL-STORED---- ENT + UP...

  • Page 42: Figure 20. Utility Function Menu Commands

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM ---------SELECT--------- -UTILITY-FUNCTIONS-MENU- ENTER ----TIME:-10:22:05AM---- -----DATE:-05/19/02----- ---SERIAL-MODE=EIA232C-- ADDR=XXX-BAUD=YYYY-P=ZZ- -DISPLAY-CONTRAST-=-XX-- DISPLAY-BRIGHTNESS-=-XX- --REFERENCE-FREQUENCY--- ----ADJUSTMENT-=-XXX---- KEY-PAD LEGEND ---CONVERTER-SLOPE------ ----ADJUSTMENT-=-X.X---- DISPLAY -------LAMP-TEST-------- ---------SELECT--------- -----------OFF---------- --MONITOR-STATUS-MENU--- Figure 20. Utility Function Menu Commands...

  • Page 43: Converter Commands

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM 3.3.1 C ONVERTER OMMANDS The converter commands are in a tree structured menu format designed for access and execution of all control functions, and to prevent the execution of an invalid entry by the operator.

  • Page 44: Configuration Functions Menu

    RF MHz (e.g.; 7250.000 to High 7750.000 MHz for Model DT-4572) in 125 KHz steps through key-pad inputs. Attenuation (ATTN): Input and displays the converter attenuation setting which is selected between 0.00 to 20.00 in 0.25 dB steps. The default setting is 10.00 dB.

  • Page 45: Monitor Status Function Menu

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM 3.3.3.2 C ONFIGURE ONVERTER ELECT This command allows the local operator to pre-select from 1 to 32 frequencies to pre-set a programmed frequency channel and attenuation setting. 3.3.3.3 C LEAR ELECT This command allows the local operator to clear a pre-set frequency and attenuation setting from a pre-selected converter.

  • Page 46: Stored Faults

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM 3.3.5.3 S YNTHESIZER AULTS Displays the synthesizer faults: Sum Loop Detect. Coarse Loop Detect. Fine Loop Detect. 3.3.5.4 C ONVERTER EMPERATURE AULT Displays a converter temperature fault condition. 3.3.6 S TORED AULTS The converter displays a total of 100 faults which are date and time stamped and stored in memory as they occur.

  • Page 47: Utility Function Menu

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM 3.3.7 U TILITY UNCTION The local operator can input commands to the following Utility Functions which are displayed on the LCD display: TIME. Military time is used in hours, minutes and seconds. DATE.

  • Page 48: Dt4572 X-Band Down Converter Rev

    DT4572 X-Band Down Converter Rev. 0 System Operation MM/DT4572.IOM NOTES:...

  • Page 49: Appendix A. Redundant System Operation

    Redundant Configurations A.1 O VERVIEW The Comtech EF Data DT-4572 Down Converter is configured for redundant system operation using distributed protection switching in an active "Daisy Chain" configuration. Comtech EF Data's Proprietary "Daisy Chain" configuration distributes the converter protection switching functions in the converters.

  • Page 50: Backup Converter

    A.2.2 D ETACHABLE ODULES Comtech EF Data's converters are designed with a detachable Input/Output Module (IOM) which contain the signal path connectors. The IOM is utilized for single thread operation, or for testing of the unit. For redundant "Daisy Chain" operations, the on-line Down Converters are provided with a detachable Receive Switch Module (RSM) replacing the IOM.

  • Page 51: Redundant Configurations

    A.3 R EDUNDANT ONFIGURATIONS Comtech EF Data DT-4572 Down Converter can be configured in several different redundant subsystem "Daisy Chain" configurations to meet the reliability requirements of a communication system. These configurations include: Table 9. 4572 Series Down Converter Configurations...

  • Page 52: Figure 21. 1:1 Redundant Configuration - Single Source If Output W/Iom And Rsm-Xx

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM IOM-XX J3 HSB LP IN LP OUT LP OUT CUSTOMER SUPPLIED RF DIVIDER OUTPUT Figure 21. 1:1 Redundant Configuration - Single Source IF Output w/IOM and RSM-XX Installed RF INPUT DOW N CO NVERTER - IOM (BACKUP UNIT) Customer...

  • Page 53: Figure 23. 1:1 Redundant Configuration Diagram - Single Source Rf Input With Iom-Xx And

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM IF Out RF In Down Converter - IOM BU EQ (Backup Unit) LP Out LP Out IF Load RF Load Loop to Loop to Next Unit Next Unit Down Converter - TSEQM (On line) LP In LP In...

  • Page 54: Figure 25 1:1 Redundant Configuration Diagram Dual Source If Output With Iom-Xx And

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM RF INPUT OUTPUT DOWN CONVERTER - IOM (BACKUP UNIT) Customer Supplied RF Divider DOWN CONVERTER - RSM OUTPUT Figure 25 1:1 Redundant Configuration Diagram Dual Source IF Output with IOM-XX and RSM-XX Installed.

  • Page 55: Figure 26. Dual Source1:N Redundant Configuration With Psm-Xx And Rsm-Xx Installed

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM POL = 1 INPUT BACKUP CONVERTER (BU) IOM-XX POL = 2 INPUT CUSTOMER SUPPLIED RF DIVIDER CONVERTER No. 1 CUSTOMER SUPPLIED RF DIVIDER LP OUT LP IN POL = 1 OUTPUT CONVERTER No.

  • Page 56: Figure 27. Dual Source 1:N Redundant Configuration Diagram With Psm-Xx And Rsm-Xx Installed

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM INPUT INPUT (POL = 1) RF INPUT (POL = 2) DOWN CONVERTER - IOM (BACKUP UNIT) DOWN CONVERTER - RSM #1 OUTPUT DOWN CONVERTER - RSM #2 OUTPUT DOWN CONVERTER - RSM #3 OUTPUT TO CONVERTER #4 IF Customer...

  • Page 57: Redundant System Configuration

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM A.4 R EDUNDANT YSTEM ONFIGURATION A.4.1 I NITIAL ONFIGURATION Redundant system configuration is controlled from the converter’s front panel configuration menu. Each online unit is assigned a redundancy configuration address. This address is dependent on the location of the online converter with reference to the backup.

  • Page 58: Automatic Configuration Verification

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM In a single polarity system set “POL=1” on all online units. In a dual polarity system, where the BU has a Polarity Switch Module (PSM) installed, configure each unit to represent the RF feed it is connected to POL=1 or POL=2.

  • Page 59: Figure 30. Converter #1 Being Backed Up

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM Figure 30 depicts the front panel displays after power has been turned off on converter #1. Note the on line LED is illuminated on the backup Converter. This indicates that the backup is now providing the frequency translation in place of the online unit.

  • Page 60: Manual Configuration/Verification

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM A.4.3 M ANUAL ONFIGURATION ERIFICATION Figure 31 shows the system with converter #1 configured for manual(M) operation. In this mode, the backup Converter can force switchover of an online unit. This mode also overrides fault status detection of the online units performed by the backup Converter.

  • Page 61: Figure 32. Forced Bu Of Converter #1

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM Figure 32 shows the front panel displays after the backup has forced converter 1 offline. Note the online LED allows the user to tell whether the backup is currently active and which converter is being by passed.

  • Page 62: Offset Adjustment

    DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM A.4.4 O FFSET DJUSTMENT The offset is used to compensate for cable and switch losses. When the system is initially set up and tested, each converter needs to be forced to backup and the offset adjusted to minimize gain mismatch between the normal and bypassed mode.
  • Page 63 DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM To remove a “Backup” converter for repair the following procedure must be used: Turn the power switch on the backup Converter rear panel to OFF, and remove the power cord from the converter. Disconnect the RF and IF cables from the IOM Module. Unscrew the rack mounting screws on the front panel of the backup Converter.
  • Page 64 DT4572 X-Band Down Converter Rev. 0 Redundant System Operation MM/DT4572.IOM NOTES:...

  • Page 65: Appendix B. Remote Control

    All converter configuration parameters as well as all monitor and status information is available via the remote port. The Comtech EF Data converter family has been designed specifically to reduce the cost and complexity associated with operating in redundancy subsystem configurations. The backup Converter in the redundancy subsystem automatically monitors the configuration and status for each of the primary (chained) converters.

  • Page 66: Protocol

    B.2.6 B NACTIVITY EQUIREMENT Comtech EF Data recommends that a minimum of 50 milliseconds bus inactivity be provided by the user between the receipt of a response from an addressed converter and issuing the next command on the serial bus.

  • Page 67: Access Methods

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.3 A CCESS ETHODS Converters may be accessed directly by using a physical address or indirectly through a backup Converter by using a virtual address. B.3.1 D IRECT CCESS Converters may be directly accessed by the EIA-232C interface or by the EIA-485 interface in a bus configuration.

  • Page 68: Addresses

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.3.2.2 EIA-232C To control by using the EIA-232C interface, one EIA-232C port on the monitor and control computer is required for each backup Converter. Virtual addressing must be established by command. All converters including the backup Converter must be in the Redundancy Mode.

  • Page 69: Message Structure

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.5 M ESSAGE TRUCTURE The structure of either a Command , Response or Error Message is as follows: Start Character. Device Address. Command or Response. End of Message String. B.5.1 S TART HARACTER The Start Character begins each message:...

  • Page 70: Error Response

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.5.5 E RROR ESPONSE If a converter cannot execute a Command or detects a protocol violation, an error response is generated. An error is flagged by changing the "/" command designator in the response to a "?".

  • Page 71: Command/Response Pairs

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6 C OMMAND ESPONSE AIRS B.6.1 U TILITY OMMANDS B.6.1.1 T Command Details Set Time: <DEV/TIM_hh:mm:ss'cr' hh = Hour* Confirmation: >DEV/TIM_hh:mm:ss'cr''lf'] mm = Minutes ss = Seconds Retrieve Time: <DEV/TIM_'cr' Confirmation: >DEV/TIM_hh:mm:ss'cr''lf'] * 24 hour military time is used.
  • Page 72 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.1.5 LCD C ONTRAST The default is 15. Command Details Set Contrast: <DEV/CON_xx'cr' xx = 0 to 30 Confirmation: >DEV/CON_xx'cr''lf'] Retrieve Contrast: <DEV/CON_'cr' Confirmation: >DEV/CON_xx'cr''lf'] B.6.1.6 LCD B RIGHTNESS The default is 15. Command Details Set Brightness...
  • Page 73 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.1.9 E QUIPMENT Equipment Type is a command that retrieves the model number and software version of the equipment. The information cannot be changed by command. Command Details Retrieve Equipment Type: <DEV/RET_'cr' Confirmation: >DEV/RET_xxxxxxxxxx yyyyyyy'cr’’lf']...

  • Page 74: Configuration Commands

    Note: xxxxxxx ... xxxxx = Your message, maximum 48 characters. B.6.2 C ONFIGURATION OMMANDS B.6.2.1 F REQUENCY The default is RF MHz (e.g.; 7250.000 MHz for Model DT-4572). Command Details Set Frequency: <DEV/FRE_xxxxx.xxx'cr' Confirmation: >DEV/FRE_xxxxx.xxx'cr''lf'] Retrieve Frequency: <DEV/FRE_'cr' Confirmation: >DEV/FRE_xxxxx.xxx'cr''lf']...
  • Page 75 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.2.2 A TTENUATOR The default is 10 dB. Command Details Set Attenuator: <DEV/ATT_ yy.yy'cr' Confirmation: >DEV/ATT_yy.yy'cr'lf'] Retrieve Attenuator: <DEV/ATT_'cr' Confirmation: >DEV/ATT_ yy.yy'cr''lf'] Note: yy.yy = 0.0 to 25.00 dB in 0.25 steps. B.6.2.3 C TART The cold start function, if enabled, mutes the output signal for a predetermined time...
  • Page 76 Note: nn = Preset Number = 01 to 32. xxxx.xxx = Frequency = RF to RF (for example, 7250.000 to 7750.000 MHz for High Model DT-4572). yy.yy = Attenuator = 00.00 to 25.00. B.6.2.7 D ISPLAY ALL RESETS This command is used to display all programmed preset numbers.

  • Page 77: Modes

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.2.8 C LEAR RESET This command is used to clear a preset number. Command Details Clear a Preset: <DEV/CLR_nn'cr' Confirmation: >DEV/CLR_nn_Cleared'cr''lf'] Note: nn = Preset Number = 01 to 32. B.6.2.9 S ELECT A RESET This command is used to configure the converter to the frequency and attenuation data...
  • Page 78 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM Command Details Initialize Command: <DEV/ICT_xx_yy'cr' Confirmation: >DEV/ICT_xx_yy'cr''lf'] Initialize Status: <DEV/ICT_'cr' Confirmation: >DEV/ICT_xx_yy'cr''lf'] xx = chain position = 01 to 12, or BU. Where BUselects the converter as the backup. yy = chain length for xx = BU (i.e. Backup Converter) 01 to 12. yy = P1 or P2, single or dual polarity Example 1: The following command assigns the converter chain position "1".

  • Page 79: Status Commands

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.3.3 B ACKUP This command allows the user to force a backup condition for maintenance and test purposes. This command must be sent to the converter designated as the backup Converter (i.e., “BU”). When activated this command forces the backup Converter to assume the state of the specified chain converter and forces the chain converter offline.
  • Page 80 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.4.2 M AINTENANCE TATUS Command Details Maintenance Status: <DEV/RMS_'cr' Confirmation: >DEV/RMS_'cr' P15_xx.x'cr' 15 VDC Supply P14_xx.x'cr' 14 VDC Supply VCC_x.x'cr' VCC Supply 5VD_x.x'cr' Display 5 VDC TEM_xx'cr' Temperature IFL_xx.x'cr' IFLO Tuning SUM_xx.x'cr' Sum Loop Tuning COR_xx.x'cr'...
  • Page 81 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.4.5 S UMMARY LARM TATUS Summary alarm is set to Fault (FT) if any of the items in Paragraph B.6.4.4 are faulted. Command Details Summary Alarm: <DEV/SAS_'cr' xx = OK or FT Confirmation: >DEV/SAS_xx'cr''lf'] B.6.4.6 T...
  • Page 82 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.4.8 P ACKED AINTENANCE TATUS Packed Maintenance Status: <DEV/PACRMS_'cr' Confirmation: >DEV/PACRMS_aabbccddeeeffgghhii'cr''lf'] where: aa = V15 scaled 123mV per count (0x00 - 0xFF) bb = V14 scaled 123mV per count (0x00 - 0xFF) bc = VCC scaled 39mV per count (0x00 - 0xFF) dd = V5D scaled 39mV per count (0x00 - 0xFF) eee = signed Temperature in degrees C (-10 to +60)

  • Page 83: Stored Alarm

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.4.10 P ACKED LARM TATUS Packed Alarm Status: <DEV/PACRAS_'cr' Confirmation: >DEV/PACRAS_abcdefghijk'cr''lf'] where: a = 1 if V15 Fault, else 0 b = 1 if V14 Fault, else 0 c = 1 if VCC Fault, else 0 d = 1 if V5D Fault, else 0 e = 1 if TEMP Fault, else 0 f = 1 if IFLO Fault, else 0...
  • Page 84 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.6.5.3 L LARMS This command retrieves a list of the stored alarms. This command is currently unavailable when using virtual addressing mode. List All Alarms: <DEV/LAA_'cr' Confirmation: >DEV/LAA_'cr' xx yyyyyyyyyyy hh:mm:ss mm/dd/yy'cr' "...

  • Page 85: Error Processing

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.7 E RROR ROCESSING B.7.1 G ENERAL RRORS The following Error Responses may be generated by any command instead of a confirmation: >DEV?COM CU CMD UNRECOGNIZED'cr''lf'] >DEV?COM IP INVALID PARAM'cr''lf'] >DEV?COM PE PARITY ERROR'cr''lf'] B.7.2 C ONFIGURATION RRORS...

  • Page 86: Converter Remote Command Summary

    DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM B.8 C ONVERTER EMOTE OMMAND UMMARY Table 10. Remote Command Summary Utility Commands Paragraph Set Time <DEV/TIM_hh:mm:ss'cr' B.6.1.1 Set Date <DEV/DAT_mm/dd/yy'cr' B.6.1.2 Set Physical Address <DEV/SPA_xxx'cr' B.6.1.3 Set Baud Rate <DEV/SBR_xxxx'cr' B.6.1.4 Set LCD Contrast <DEV/CON_xx'cr'...
  • Page 87 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM Status Commands Paragraph Retrieve Configuration Status <DEV/RCS_'cr' B.6.4.1 Retrieve Maintenance Status <DEV/RMS_'cr' B.6.4.2 Retrieve Utility Status <DEV/RUS_'cr' B.6.4.3 Retrieve Alarm Status <DEV/RAS_'cr' B.6.4.4 Summary Alarm Status <DEV/SAS_'cr' B.6.4.5 Terminal Status Change <DEV/TSC_'cr' B.6.4.6 Packed Configuration Status...
  • Page 88 DT4572 X-Band Down Converter Rev. 0 Remote Control MM/DT4572.IOM NOTES:...

  • Page 89: Appendix C. Theory Of Operation

    This appendix contains a general description of the theory of operation for the Model DT- 4572 Down Converter. The DT-4572 Down Converter is used for SCPC, DAMA AND TDMA, as well as for full transponder HDTV and analog TV, applications.

  • Page 90: Rf Signal Conversion

    IGNAL ONVERSION As a typical example of the RF signal processing, the RF input to the DT-4572 Down Converter is 7250 to 7750 MHz at a typical level of -45 dBm. The RF is mixed in the first mixer with a 6030 to 6530 MHz synthesizer signal from a multiplier, in 125 kHz fine tuning steps.

  • Page 91: Figure 33. Typical Converter Functional Block Diagram (Model Dt-4572 Shown)

    Theory of Operation MM/DT4572.IOM IF OUTPUT RF INPUT I/O MODULE (70 or 140 MHz) (7250-7750 MHz) MONITOR & CONVERTER CONTROL SIGNAL PATH MODULE 5/10 MHz SYNTHESIZER OSC. REF. OSC. POWER SUPPLY Figure 33. Typical Converter Functional Block Diagram (Model DT-4572 shown)

  • Page 92: Monitor & Control

    DT4572 X-Band Down Converter Rev. 0 Theory of Operation MM/DT4572.IOM C.3 M & C ONITOR ONTROL The Monitor & Control Assembly is designed to monitor the functions of the converter, and provide the control for remote and local command inputs to the converter. Remote control inputs are provided through the EIA-232CC or EIA-485 communications port on the rear of the panel, or by local operator inputs through the key-pad on the front panel.

  • Page 93: Appendix D. Maintenance And Troubleshooting

    This appendix is intended to provide procedures to assist operator and maintenance personnel in the checkout, maintenance and troubleshooting of the converter. Comtech EF Data recommends that spare replacement converters be used to replace converters removed from the system for maintenance. Troubleshooting procedures are provided for fault isolation to the module level.

  • Page 94: Maintenance Testing

    DT4572 X-Band Down Converter Rev. 0 Maintenance and Troubleshooting MM/DT4572.IOM Prime Power Cord Input 5/10 MHz Ref. Osc. Input Reference Power Oscillator Fine Supply Step Summary Fault Relay Output Module Serial Comm. Interface (RS-485 / RS-232C)- COM 1 Monitor & Control Assembly High Speed Bus (HSB) IF Ouput (IF) IF Loop Input (LP IN)

  • Page 95: Troubleshooting

    The 5 Vdc is developed in the modules. Check the output of the 15 Vdc Power Supply Module, check for other module faults, and check all connections. If the fault still exists, remove the converter and return it to Comtech EF Data for repair.
  • Page 96 A fault (“FT”) indicates that the coarse loop is not locked. Check all connections to the converter module to make sure they are secure. If the fault still exists, remove the Fine Step Module and return it to Comtech EF Data for repair. FINE LOOP DETECT: A fault (“FT”) indicates that the fine loop is not locked.

  • Page 97: Converter I/O Modules

    - install screws “hand tight” only. IMPORTANT D.3 S PARES Comtech EF Data recommends sparing at the RF converter level. If sparing at a lower level is desired, please contact Comtech EF Data for the correct spares for your particular converter.
  • Page 98 DT4572 X-Band Down Converter Rev. 0 Maintenance and Troubleshooting MM/DT4572.IOM NOTES:...

  • Page 99: Index

    Converter I/O Modules ......79 Initial Configuration........39 Converter Remote Command Summary..68 INSTALLATION ........9 Installation, Operation and Maintenance ...74 Current Faults Function Menu ....27 Customer Support ........ii INTRODUCTION ........1 Detachable Modules........32 MAINTENANCE AND TROUBLESHOOTING.......75 Device Address ..........51 Maintenance Testing........76 Dimensional Envelope (DT-4572)....6...
  • Page 100 DT4572 X-Band Down Converter Rev. 0 Index MM/DT4572.IOM Manual Configuration/Verification ...42 Stored Faults ..........28 Message Structure........51 Summary Fault Output (RELAY), Connector P1........12 Metric Conversion ........ix Switching Power ON .........17 Mode Errors ..........67 SYSTEM OPERATION ......15 Modes............59 Monitor & Control ........74 Monitor Status Function Menu ....27 Test Point Samples........76 THEORY OF OPERATION......71...
  • Page 101 METRIC CONVERSIONS Units of Length Unit Centimeter Inch Foot Yard Mile Meter Kilometer Millimeter 1 centimeter — 0.3937 0.03281 0.01094 6.214 x 10 0.01 — — 1 inch 2.540 — 0.08333 0.2778 1.578 x 10 0.254 — 25.4 1 foot 30.480 12.0 —...
  • Page 102 2114 West 7th Street Tempe Arizona 85281 USA 480 • 333 • 2200 Phone 480 • 333 • 2161 FAX...

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