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Orbital Systems LRD-200B Installation, Operation And Maintenance Manual

Low-rate demodulator
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Low-Rate Demodulator
Orbital Systems, Ltd.
www.OrbitalSystems.com
LRD-200B
Installation, Operation,
and Maintenance Manual
Manual P/N:
MA 240-003
Revision:
B.03
Release Date: 11/2/2015
3807 Carbon Rd.
Irving, TX 75038 USA

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Summary of Contents for Orbital Systems LRD-200B

  • Page 1 LRD-200B Low-Rate Demodulator Installation, Operation, and Maintenance Manual Manual P/N: MA 240-003 Revision: B.03 Release Date: 11/2/2015 Orbital Systems, Ltd. 3807 Carbon Rd. www.OrbitalSystems.com Irving, TX 75038 USA...
  • Page 2 LRD-200B Low-Rate Demodulator Copyright 2012, Orbital Systems, Ltd. All rights reserved. © This document may be freely distributed. Printed in the United States of America. Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.
  • Page 3 LRD-200B Low-Rate Demodulator Document Data File Name LRD-200B Operation, Installation, and Maintenance Manual Document Number MA 240-001 Document Authors Robert Chuvarsky Document History Revision Number Date Revised By Purpose of Revision A.01 2008-12-05 Draft B.01 2012-01-10 R. Chuvarsky Release Version Added new command B.02...
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  • Page 5: Table Of Contents

    2.3.8 USB ........................... 18 2.3.9 General Information ....................19 SECTION 3 OPERATING INSTRUCTIONS ............21 3.1 LRD-200B DEMODULATOR INDICATORS, CONTROLS, AND DISPLAY ..23 3.1.1 System Status Indicators ................... 24 3.1.2 Operational Display ....................25 3.1.3 Setup Buttons ......................26 3.2 OPERATIONAL FLOW OF THE SETUP BUTTONS..........
  • Page 6 THEORY OF OPERATION ..............61 6.1 INPUT SELECTION AND CONVERSION TO 70 MHZ .......... 61 6.2 DIGITAL DEMODULATOR ..................63 6.3 SYMBOL DECODING AND FORMATTING ............64 6.4 USB INTERFACE ......................65 Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.
  • Page 7 Table 8 - Commands ....................54 List of Figures Figure 1 - LRD-200B Low Rate Demodulator (Front View) ......... 9 Figure 2 - LRD-200B Low Rate Demodulator (Rear View) .......... 9 Figure 3 - Rubber Foot Pads and Screws ..............13 Figure 4 - Rack Mounting ....................
  • Page 8 Figure 37 - Input Selection and Conversion to 70 MHz ..........62 Figure 38 - Digital Demodulator ................. 63 Figure 39- Symbol Decoding and Formatting ............64 Figure 40 - USB Interface.................... 65 Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 9: Introduction

    70 MHz for compatibility with Orbital Systems, Ltd. downconverters, IFDs (Integrated Feed Downconverters), and third-party products. The LRD-200B uses selectable SAW (Surface Acoustic Wave) filters in the IF to provide superior out-of-band signal rejection. This function is important with the proliferation of cellular phone and other wireless device signals in L-band and S-band.
  • Page 10 The command set also supports a compatibility mode for previous models of Orbital Systems, Ltd. receivers. The LRD-200B has an optional USB 2.0 high-speed interface to control the receiver and to retrieve received data. USB drivers and sample code are available to support application developers.

  • Page 11: Table 1 - Specifications

    RS-422, LVDS and 50 ohm TTL Data and Clock Interface Connectors RS-422, LVDS - DB15 female 50 ohm TTL - SMA female Table 1 - Specifications *Specifications subject to change without notice. Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.
  • Page 12 LRD-200B Low-Rate Demodulator Table 1 (Continued) LRD-200B Specifications Optional USB Interface Connector/Speed Type mini B, USB 2.0 high-speed only Data Format Unframed (software framing) Electrical / Mechanical Supply Voltage/Power 100 to 240 VAC, < 30 watts Fuse 1.5 amp, 5 x 20 mm...

  • Page 13: Installation

    LRD-200B Low-Rate Demodulator SECTION 2 INSTALLATION The LRD-200B is built in a 1U enclosure that can be desktop or rack mounted. It is designed to operate in a standard office environment. 2.1 DESKTOP USE Four (4) rubber foot pads must be installed on the bottom of the LRD-200B for desktop use (see Figure 3).

  • Page 14: Rack Use

    61-centimeter to 71-centimeter (24-inch to 28-inch) deep rack. To mount the LRD-200B in a rack, remove the four rubber foot pads and screws, and then attach the rack supports using the fasteners shown in Figure 4. Mount the LRD- 200B with rack supports into the rack enclosure.

  • Page 15: Ethernet

    ( ) position, and then plug the IEC end of the power cord into the LRD-200B power plug. Plug the cord into a power source. Do not apply the power until all other connections to the LRD-200B have been completed.

  • Page 16: Rf Cables

    Figure 6 - Ethernet Connection The Ethernet interface must be properly configured before it can be used to communicate with the LRD-200B. To determine the correct configuration, refer to SECTION 3 in this manual or to the system documentation. 2.3.3 RF Cables •...

  • Page 17: Earth Ground

    (see Figure 5). 2.3.5 Data Connections The LRD-200B NRZ data and clock connections are located on the rear panel. These connections have RS-422, LVDS, and 50-ohm TTL interfaces (see Figure ). These interfaces are active and can be used simultaneously.

  • Page 18: Rs-422 And Lvds Connections

    2.3.8 The LRD-200B supports an optional USB interface. Connect a standard USB 2.0 high-speed cable (type mini B end) to J05, and then connect it (type A end) to the system control computer.

  • Page 19: General Information

    Refer to SECTION 3 to set the data and clock polarities as required. After the LRD-200B has been installed and the cables have been connected, route the cables in a manner appropriate for safety, convenience, and to prevent them from becoming damaged.
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  • Page 21: Operating Instructions

    2. Use a comprehensive remote control command set that can access the demodulator through a serial connection (telnet optional). Several parameters are static, and they are configured to correspond to the system application for which the LRD-200B is used. Other parameters are dynamic, and they require modifications to receive data from different satellites.
  • Page 22 LRD-200B Low-Rate Demodulator Table 3 (Continued) LRD-200B Configuration Parameters Configurable Options Description Parameter • • On This setting turns on or turns off the power output on J01, which is • Off used to apply power to a downconverter or to the feed.

  • Page 23: Lrd-200B Demodulator Indicators, Controls, And Display

    Disable disable the setup buttons. Switches • Yes 3.1 LRD-200B DEMODULATOR INDICATORS, CONTROLS, AND DISPLAY The following controls, indicators, and display are used to configure the demodulator (see red highlighted areas in Figure 10): • The LED status indicators • The LCD operational display •...

  • Page 24: System Status Indicators

    LRD-200B Low-Rate Demodulator 3.1.1 System Status Indicators Six (6) LED indicators are used to provide system status (see Figure 11). Figure 11 - System Status Indicators Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 25: Operational Display

    3.1.2 Operational Display The receive frequency, input attenuator settings, and demodulator lock status are indicated on the operational display (see Figure 12). Figure 12 - Operational Display and Description Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.

  • Page 26: Setup Buttons

    LRD-200B Low-Rate Demodulator 3.1.3 Setup Buttons Two (2) setup buttons are used to configure the LRD-200B (see Figure 13). Figure 13 - Setup Buttons • The upper setup button is used to select the operating parameter (see Figure 14). The operating parameter functions are described in Table 3.

  • Page 27: Operational Flow Of The Setup Buttons

    FY3 HRPT user would be returned to the first mode displayed in the vertical flow, which in this example is (see Figure 14). NOAA HRPT Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.

  • Page 28: Figure 14 - Parameter Setup Flow Chart

    LRD-200B Low-Rate Demodulator Figure 14 – Parameter Setup Flow Chart Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 29: Instructions For Configuring The Lrd-200B

    LRD-200B Low-Rate Demodulator 3.3 INSTRUCTIONS FOR CONFIGURING THE LRD-200B Use the following instructions to configure the LRD-200B. Each step of the instructions is accompanied with an image of the parameter option that will display. 3.3.1 RF Input Mode mode is the first function to display during the setup process. Press...

  • Page 30: Demodulator Mode

    • FY 3 HRPT After the last satellite in the Demodulator Mode has been selected (FY3 HRPT in this example) the mode defaults to the first satellite (NOAA HRPT). Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 31: Power Output

    Figure 17 - Demodulator Modes 3.3.4 Power Output function displays after . Press the lower Power Output Demodulator Mode setup button to select (see Figure 18). Figure 18 - Power Output Settings Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.

  • Page 32: Input Attenuator

    Input Attenuator setup button to select normal or inverted clock polarity to correspond to the user’s hardware requirements (see Figure 20). Figure 20 - Normal or Inverted Clock Polarity Setting Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 33: Data Polarity

    . Press the lower Display Signal Level Data Polarity setup button to display the signal level as dBM, volts, or a count (see Figure 22). Figure 22 - Display Signal Level Setting Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.

  • Page 34: Offset: Xxxx.xxx Mhz

    (see Figure 23). Figure 23 - Offset Setting 3.3.10 Serial Number The LRD-200B serial number is displayed after (see Figure 24). Offset Figure 24 - LRD-200B Serial Number Revision B.03...

  • Page 35: Disable Switches

    LRD-200B Low-Rate Demodulator 3.3.11 Disable Switches function displays after the LRD-200B Disable Switches Serial Number Press the lower setup button to enable or disable the setup buttons (see Figure 25). Figure 25 - Disable Switches Setting 3.3.12 Exit Setup Mode Use one of the following methods to exit the setup mode (see Figure 26).
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  • Page 37: Receiver Remote Control

    LRD-200B Low-Rate Demodulator SECTION 4 RECEIVER REMOTE CONTROL The LRD-200B provides an RG45 10/100 Ethernet port for remote control. This interface uses a Lantronix Xport interface device, which must have an IP address and serial protocol ® configuration assigned to it before it can operate. The IP address is set to an appropriate value for the user’s network.

  • Page 38: Configuring The Ip Address

    LRD-200B Low-Rate Demodulator 4.1.1 Configuring the IP Address When used with an Orbital Systems, Ltd. front end server (FES), the IP address is set at the factory to 192.168.124.171 with telnet on port 10001. The default Lantronix IP address is 192.168.124.171. If DeviceInstaller™ does not detect the Lantronix device, close DeviceInstaller™.

  • Page 39: Assigning An Ip Address

    Figure 29 - The Assign IP Address Window 3. If a device was not selected initially (refer to Figure 27), a Device prompt is displayed on the window Identification Assign IP Address Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.

  • Page 40: Figure 30 - Device Identification Prompt

    , and then click (see red highlighted area in Figure 31). address Next Figure 31 - Assign a Specific IP Address 6. The window opens (see Figure 32). IP Settings Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 41: Table 4 - Ip Settings Guidelines

    Next Assignment 8. Click to assign the IP address to the device. A status message Assign confirms the IP address has been assigned. 9. Click to exit. Finish Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.

  • Page 42: Configuring The Telnet Port

    Change Setup Change Setup Change Setup: 0 Server 1 Channel 1 3 E-mail 5 Expert 6 Security 7 Defaults 8 Exit without save 9 Save and Exit Your choice? _ Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 43: Table 5 - Reserved Port Numbers

    Port Number Comments 1 to 1024 Reserved (well-known ports) 9999 Telnet setup 14000 to 14009 Reserved for redirector 30704 Reserved (77FOh) 30718 Reserved (77FEh) Table 5 - Reserved Port Numbers Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.
  • Page 44 8 Exit without save 9 Save and Exit Your choice? _ 9. Save the new configuration (option 9). The unit will reboot. This document reflects the current released Firmware Version Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 45: Command Format

    • The invalid or unrecognized command or status request response is !000 • All command settings are retained in a non-volatile memory when power is not applied. Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.

  • Page 46: Receiver Operating Modes

    LRD-200B Low-Rate Demodulator 4.1.7 Receiver Operating Modes The LRD-200B supports one or more operating modes that can be referenced using a three or four (3 or 4)-character string. LRD-200B Operating Modes String Description HRPT NOAA HRPT METP METOP AHRPT SVSR...

  • Page 47: Receiver Operating Frequency

    142.0 MHz, which is in range for input When changing between L-band and S-band, or between the five (5) downconverter offset options in the Orbital Systems, Ltd. LSX feed, the feed offset and receiver offset should be the same.

  • Page 48: Status Requests And Responses

    !110:xxxx.xxx The 4.3 current offset input 1? ?dc_power Is the downconverter !111:ON or power on or off for the !111:OFF current input? Table 7- Status Requests Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.
  • Page 49 How is the signal level !123:dBm or ?rssi_display_type displayed on the front !123:volts or LCD? !123:count !124:enabled or Are the front panel setup !124:disabled ?switch_setup buttons enabled or disabled? Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.
  • Page 50 500 = -50 dBm !158:locked ?rf_lo_lk Is the either LO synthesizer locked? ?if_lo_lk !159:unlocked !155:ok Is the downconverter ?dc_current current OK for the current input? !155:over current Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.
  • Page 51 Error status is: 0 for no errors 1 for PLL unlocked 2 for overcurrent 3 for both Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.
  • Page 52 F = frame synch ?demod_status_ bits “-“ = not locked. For diagnostic Diagnostic only Returns a hex character purposes only representing the !161:D demodulator internal state ?demod_state Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.
  • Page 53 Returns an approximation !162:3.61e synchronized ?rx_ber of the uncorrected bit error • Otherwise returns -1e-7 rate signal For diagnostic Returns the demodulator Diagnostic only purposes only Xilinx code revision !196:x ?demod_rev Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.

  • Page 54: Commands

    LRD-200B Low-Rate Demodulator 4.1.10 Commands The LRD-200B has two (2) inputs. The following parameters can be set independently for each input: • Frequency • Offset • Operating mode • Clock polarity • Data polarity Changing inputs changes all operating parameters to those set for the selected input.
  • Page 55 • one (1) • invert x can be one of: • zero (0) select the clock polarity for • normal !clock_polarity_1:x the input • one (1) • invert Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.
  • Page 56 Inputting the frequency or offset in 4.3 format is not necessary. 1556 is equivalent to 1556.000. The receive frequency and offset must resolve to a value with 25 KHz resolution. Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 57: Maintenance

    5.1 FUSE REPLACEMENT Two (2) line input fuses are contained in the integrated power input module on the rear of the rack mount unit (see Figure 33). The LRD-200B primary power input requires two 5 x 20mm fast-acting fuses, 1.5 amps.

  • Page 58: Removing The Fuse Holder

    2. Pinch together the retaining tabs and pull the fuse holder from the power input module (see Figure 35). Remove and replace the fuses. 3. Reinstall fuse holder in the power input module. Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 59: Problem Resolution

    US Central Time (GMT-006), by email: support@orbitalsystems.com, or by telephone: 972-915-3669. To return a unit, please contact the technical support team for a RMA number and shipping instructions. Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.
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  • Page 61: Theory Of Operation

    Figure 36 - Theory of Operation The LRD-200B accepts either a fixed 70 MHz input or a tunable 140 MHz RF input. The signal from the selected input is filtered, amplified, and then converted to a 70 MHz IF. The 70 MHz IF is sampled with a logarithmic amplifier to provide signal level indication and is then sent to the digital demodulator.

  • Page 62: Figure 37 - Input Selection And Conversion To 70 Mhz

    It also is amplified in an AGC circuit to provide the correct signal amplitude to the digital demodulator. Figure 37 - Input Selection and Conversion to 70 MHz Revision B.03 LRD-200B Low-Rate Demodulator. © Copyright 2012, Orbital Systems, Ltd.

  • Page 63: Digital Demodulator

    (quadrature phase) soft decision symbol output. The soft decision output provides additional information about the accuracy of the symbol decision, which is useful if the signal requires Viterbi decoding. Revision B.03 LRD-200B Low-Rate Demodulator © Copyright 2012, Orbital Systems, Ltd.

  • Page 64: Symbol Decoding And Formatting

    6.3 SYMBOL DECODING AND FORMATTING Figure 39- Symbol Decoding and Formatting The various signals that the LRD-200B can demodulate are transmitted using different modulation techniques, symbol encoding, and forward error correction. The purpose of the symbol decoding and formatting section is to convert these various signals into a standard NRZ data format and corresponding bit rate clock.

  • Page 65: Usb Interface

    LRD-200B Low-Rate Demodulator The LRD-200B includes a frame detector that is used to detect the correct data polarity for such PSK signals as NOAA HRPT. This detector also assists with Viterbi recovery for punctured signals such as METOP. The recovered bit clock and data are converted using interface drivers to provide outputs in RS-422, LVDS, TTL and 50 ohm TTL formats.
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