Orbital Systems LRD-200B User manual

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

LRD-200B Low-Rate Demodulator
LRD-200B Low-Rate Demodulator.
©Copyright 2012, Orbital Systems, Ltd.
Revision B.03
2
©Copyright 2012, Orbital Systems, Ltd. All rights reserved.
This document may be freely distributed.
Printed in the United States of America.

LRD-200B Low-Rate Demodulator
LRD-200B Low-Rate Demodulator
©Copyright 2012, Orbital Systems, Ltd.
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Revision B.03
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
B.02 2012-05-03 R. Chuvarsky Added new command status requests and
responses
B.03 2.015-11-02 M. Morgan Corrected Table 1 Data
Values
Approvals
Revision Number Date Name

LRD-200B Low-Rate Demodulator
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TABLE OF CONTENTS
SECTION 1 INTRODUCTION....................................................................................9
SECTION 2 INSTALLATION...................................................................................13
2.1 DESKTOP USE............................................................................................................... 13
2.2 RACK USE...................................................................................................................... 14
2.3 CONNECTIONS............................................................................................................. 14
2.3.1 Power ........................................................................................................................ 14
2.3.2 Ethernet..................................................................................................................... 15
2.3.3 RF Cables.................................................................................................................. 16
2.3.4 Earth Ground............................................................................................................. 17
2.3.5 Data Connections...................................................................................................... 17
2.3.6 RS-422 and LVDS Connections............................................................................... 18
2.3.7 50 Ohm TTL Connections ........................................................................................ 18
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.............................................. 27
3.3 INSTRUCTIONS FOR CONFIGURING THE LRD-200B ....................................... 29
3.3.1 RF Input Mode.......................................................................................................... 29
3.3.2 Frequency.................................................................................................................. 29
3.3.3 Demodulator Mode................................................................................................... 30
3.3.4 Power Output ............................................................................................................ 31
3.3.5 Input Attenuator........................................................................................................ 32
3.3.6 Clock Polarity........................................................................................................... 32
3.3.7 Data Polarity ............................................................................................................. 33
3.3.8 Display Signal Level................................................................................................. 33
3.3.9 Offset: xxxx.xxx MHz.............................................................................................. 34
3.3.10 Serial Number........................................................................................................... 34
3.3.11 Disable Switches....................................................................................................... 35
3.3.12 Exit Setup Mode ....................................................................................................... 35
SECTION 4 RECEIVER REMOTE CONTROL.....................................................37
4.1 CONNECTING TO LANTRONIX AND CONFIGURING THE ETHERNET
INTERFACE USING DEVICEINSTALLER™.................................................................. 37
4.1.1 Configuring the IP Address ...................................................................................... 38
4.1.2 Open DeviceInstaller™............................................................................................. 38
4.1.3 Assigning an IP Address........................................................................................... 39
4.1.4 Configuring the Telnet Port...................................................................................... 42
4.1.5 Command Format ..................................................................................................... 45

LRD-200B Low-Rate Demodulator
LRD-200B Low-Rate Demodulator.
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4.1.6 Response Format....................................................................................................... 45
4.1.7 Receiver Operating Modes ....................................................................................... 46
4.1.8 Receiver Operating Frequency ................................................................................. 47
4.1.9 Status Requests and Responses................................................................................. 48
4.1.10 Commands ................................................................................................................ 54
SECTION 5 MAINTENANCE...................................................................................57
5.1 FUSE REPLACEMENT................................................................................................ 57
5.1.1 Removing the Fuse Holder ....................................................................................... 58
5.2 PROBLEM RESOLUTION........................................................................................... 59
SECTION 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

LRD-200B Low-Rate Demodulator
LRD-200B Low-Rate Demodulator
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List of Tables
Table 1 - Specifications ..............................................................................................11
Table 2 - J04 Pinout.....................................................................................................18
Table 3 - Configurable Parameters ............................................................................21
Table 4 - IP Settings Guidelines.................................................................................41
Table 5 - Reserved Port Numbers..............................................................................43
Table 6 - LRD-200B Operating Modes........................................................................46
Table 7- Status Requests............................................................................................48
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............................................................................................14
Figure 5 - Power Entry ................................................................................................15
Figure 6 - Ethernet Connection..................................................................................16
Figure 7 - RF Cable Connections...............................................................................16
Figure 8 - Data Connections.......................................................................................17
Figure 9 - Pre-Configured Cable and Connector With Screws.................................17
Figure 10 - Front Panel ...............................................................................................23
Figure 11 - System Status Indicators.........................................................................24
Figure 12 - Operational Display and Description......................................................25
Figure 13 - Setup Buttons...........................................................................................26
Figure 14 – Parameter Setup Flow Chart...................................................................28
Figure 15 - 140 MHz and 140/70 MHz RF Input Settings ...........................................29
Figure 16 - Frequency Settings (Select and Set Digits)............................................29
Figure 17 - Demodulator Modes.................................................................................31
Figure 18 - Power Output Settings.............................................................................31
Figure 19 - Input Attenuator Settings.........................................................................32
Figure 20 - Normal or Inverted Clock Polarity Setting..............................................32
Figure 21 - Data Polarity Setting ................................................................................33
Figure 22 - Display Signal Level Setting....................................................................33
Figure 23 - Offset Setting............................................................................................34
Figure 24 - LRD-200B Serial Number.........................................................................34
Figure 25 - Disable Switches Setting.........................................................................35
Figure 26 - Exit Setup Mode Setting...........................................................................35
Figure 27 - Selecting the Lantronix Device................................................................38
Figure 28 - Assigning an IP Address .........................................................................39
Figure 29 - The Assign IP Address Window..............................................................39
Figure 30 - Device identification Prompt ...................................................................40
Figure 31 - Assign a Specific IP Address ..................................................................40
Figure 32 - IP Settings Window..................................................................................41
Figure 33 - Fuse Holder ..............................................................................................57

LRD-200B Low-Rate Demodulator
LRD-200B Low-Rate Demodulator.
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Figure 34 - Fuse Holder Release Tabs.......................................................................58
Figure 35 - Fuse Holder Removal...............................................................................58
Figure 36 - Theory of Operation.................................................................................61
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

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LRD-200B Low-Rate Data Demodulator
Figure 1 - LRD-200B Low-Rate Demodulator (Front View)
Figure 2 - LRD-200B Low-Rate Demodulator (Rear View)
SECTION 1 INTRODUCTION
The Orbital Systems, Ltd. LRD-200B demodulator is a versatile DSP (Digital Signal
Processing)-based receiver used for the following satellites that transmit in the L-band and S-
band:
•Polar orbiting satellites
•Geosynchronous weather satellites
•EOS (earth observation satellites)
The LRD-200B supports selectable IF (Intermediate Frequency) inputs at both 140 MHz and
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.
The incoming signal is passed through a programmable attenuator to extend the input
dynamic range. It is converted to a 70 MHz first IF, and then converted to a 10 MHz IF for
processing by the digital demodulator. The signal is filtered and directly digitized at 100
MSPS (Million Samples Per Second) with 10-bit resolution.

LRD-200B Low-Rate Demodulator
LRD-200B Low-Rate Demodulator.
©Copyright 2012, Orbital Systems, Ltd.
Revision B.03
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DSP is used to facilitate the following functions:
•Tuning
•AGC
•Carrier tracking
•Symbol recovery
DSP provides the following advantages:
•Long term repeatable performance without component drift
•Flexible multimode operation
The LRD-200B provides both RS-232 serial and Ethernet control ports. It is equipped with
clock and data outputs at RS-422 and LVDS on a 15-pin “D” connector. 50-ohm TTL
versions on SMA connectors also are provided. The LRD-200B supports direct connection to
the SSEC SDI and to most other PC-based data ingest interfaces.
The receiver command set supports complete operational control and status monitoring of
receiver operation. 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. Detailed information for the LRD-200B is shown in Table 1.