Orbital Systems LRD-200B User manual
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.
3
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
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
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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
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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.
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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.
LRD-200B Low-Rate Demodulator
LRD-200B Low-Rate Demodulator
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LRD-200B Specifications*
Radio Frequency
Input Frequency (Input 0) 126 to 154 MHz (25 KHz steps)
Input Frequency (Input 1) 70 MHz (fixed) or 126 MHz to 154 MHz
Input Dynamic Range -90 dBm to -20 dBm (with max attenuation)
Image Rejection > 60 dB
Input Impedance 50 ohms
Input Return Loss > 15 dB
Input to Input Isolation >60 dB
IF Frequency 70 MHz
IF Bandwidth 3 MHz/6 MHz selectable (SAW Filters)
LO Frequency 196 to 224 MHz (25 KHz steps)
Signal Strength (RSSI) Output 0 to 3.5 VDC, 30 mV/dB nominal
-50 dBm = 2.3 VDC
Demodulator (DSP)
Demodulator Modes QPSK, BPSK, PSK
Demodulator Implementation Loss <0.5 dB at 10E-6 BER (QPSK / BPSK)
0.2 dB typical
Baseband Filter Root Raised Cosine (RRC)
variable alpha
Data
Supported Data Encoding NRZ-L, NRZ-S, NRZ-M, Biphase-L
Supported Symbol Rates 0.1 to 3.5 MSPS
Convolutional Decoding Viterbi K=7, rate ½, rate ¾, and dual-rate
¾
G1=171 G2=133
Interface
Control Interface RS-232 serial at 9600,N,8,1 and
Ethernet using telnet
Control Interface Connector RJ45 (Ethernet) or DB 9 female (RS-232)
Data and Clock Interface 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.
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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
Power Connector IEC C-13 3 conductor
Downconverter Power Output 11.5 VDC @ 400 mA max
Automatic current limit
(RF Input zero (0) only)
RF Input Connectors Type N female
Signal Level Output Connector Type SMA female
Size 48-cm )19-inch) rack standard, 1U high
254 mm (10 inches) deep
Support Fixed side rails
Weight 4.1 Kg (9 lbs)
Operating Temperature Zero (0°) to 50° C (32° to 122° F)
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Do not place anything on top of the LRD-200B that prevents air circulation
and ventilation.
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).
Figure 3 - Rubber Foot Pads and Screws
The LRD-200B requires at minimum clearance of five (5) centimeters (2
inches) for ventilation/airflow. Placing an Orbital Systems, Ltd. HRD or LRD
receiver on top of the LRD-200B is permitted if the unit also has rubber foot
pads installed.
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Maintain a minimum of 1U of space above and below the LRD-200B for air
circulation and ventilation.
2.2 RACK USE
The LRD-200B is designed for installation in a standard 48-centimeter (19-inch)
wide by 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.
Figure 4 - Rack Mounting
2.3 CONNECTIONS
2.3.1 Power
The LRD-200B contains a universal power supply that supports power input
voltages from 100 to 240 VAC at 50 to 60 Hz. The power input is a standard
IEC C-13 type. The LRD-200B usually is supplied with the appropriate power
cord for the customer’s location. In some circumstances, however, the power
cord cannot be supplied and the customer must provide it. The customer must
obtain a power cord rated at six (6) amps for local use. The integrated power
input module is shown in Figure 5.
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Do not apply the power until all other connections to the LRD-200B
have been completed.
Figure 5 - Power Entry
Prior to connecting the power cord, make sure the power switch on the power
input module is in the off (O) position, and then plug the IEC end of the power
cord into the LRD-200B power plug. Plug the cord into a power source.
2.3.2 Ethernet
The LRD-200B is designed for remote control using an Ethernet connection.
Use of a private network, and not the user’s local network, is recommended for
connecting the LRD-200B and other receiver components to the system control
computer.
When used with a system that Orbital Systems, Ltd. has provided, the LRD-
200B is connected to an Ethernet 10/100 switch. That switch is connected to a
private network port on the Orbital Systems, Ltd. front end server (FES). Refer
to Orbital Systems, Ltd. installation documents for more information. Consult
the system provider documentation to determine connections for other
installations.
The LRD-200B is connected to the control network with a category 5 (CAT5)
or higher cable installed at J08. The Ethernet connection location is shown in
Figure 6.
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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
•J01 supports 140 MHz
•J02 supports 70 MHz or 140 MHz
–Connect the 140 MHz RF cable to J01 or J02 on the rear panel. If a
70 MHz RF cable is used, connect it to J02 (see Figure 7).
Figure 7 - RF Cable Connections
Refer to the Operation section of this manual or system documentation to
properly set the input attenuator for correct operation. The user also can
connect to J03 (RSSI DCV output) to monitor the input signal.
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2.3.4 Earth Ground
The LRD-200B has an earth ground connector located near the power on/off
switch. Refer to local electrical codes and system documentation to determine
when to use 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 8). These interfaces are active and can be used simultaneously.
Figure 8 - Data Connections
When used with an Orbital Systems, Ltd. front end server, pre-configured
cables are provided for J04. Plug the cable into J04, and secure it using the
screws retained in the connector (see Figure 9).
Figure 9 - Pre-Configured Cable and Connector With Screws
Orbital Systems, Ltd. systems use either the RS-422 or LVDS signals. All new
systems use LVDS.
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2.3.6 RS-422 and LVDS Connections
The RS-422 and LVDS signals are output on J04; the J04 connector is a
standard 15-pin D female connector (see Table 2 for the connector pinout).
J04 Pinout
Pin Number Function Pin Number Function
1 RS-422 Data (+) 9 RS-422 Data (-)
2 RS-422 Clock (+) 10 RS-422 Clock (-)
3 Not Used 11 Not Used
4 LVDS Data (+) 12 LVDS Data (-)
5 LVDS Clock (+) 13 LVDS Clock (-)
6 Not Used 14 Ground
7 Not Used 15 Not Used
8 Not Used
Table 2 - J04 Pinout
Consult data interface documentation to determine the correct signal types and
connections to use with your system. Both RS-422 and LVDS signals are
differential and require the use of twisted pair cables for optimal operation.
The length of these cables must as short as possible, with a maximum length of
two (2) meters (6.5 feet).
2.3.7 50 Ohm TTL Connections
Single-end 50-ohm TTL data and clock signals are available on J06 and J07.
These signals require the use of a high-quality, double-shielded 50-ohm coaxial
cable with SMA connectors for the LRD-200B and appropriate 50-ohm
connectors for external data interfaces. Avoid using adapters if possible. The
data and clock cables must be the same length for optimal operation.
2.3.8 USB
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. Refer to SECTION 3 for the USB
configuration.
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2.3.9 General Information
Proper operation of the data interface requires that the signal level and polarity
outputs from the LRD-200B correspond to the input requirements of the
external data interface. 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. If the LRD-200B is mounted in a rack,
fastening the cables to the rails using plastic ties is recommended.
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