Quorum GRB-200 Instruction Manual

GRB-200
Demodulator
(GOES-R)
Operation, Installation,
and Maintenance Manual
Revision: A.01
Release Date:
Quorum Communications, Inc. 3807 Carbon Rd.
www.qcom.com Irving, TX 75038 USA

GRB-200 Demodulator (GOES-R) OI&M
GRB-200 Demodulator (GOES-R) OI&M
© Copyright 2015, Quorum Communications, Inc.
Revision A.01
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© Copyright 2015, Quorum Communications, Inc.
All rights reserved.
This document may be freely distributed.
Printed in the United States of America.

GRB-200 Demodulator (GOES-R) OI&M
GRB-200 Demodulator (GOES-R) OI&M
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Revision A.01
Version History
Revision
No. Implemented By Revision Date Approved
By Approval Date Reason for
Change
A.01 M. Morgan 06/01/2015 A. Bundens 06/15/2015 New Document

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TABLE OF CONTENTS
SECTION 1 INTRODUCTION....................................................................................7
SECTION 2 INSTALLATION...................................................................................11
2.1 DESKTOP USE............................................................................................................... 11
2.2 RACK USE...................................................................................................................... 12
2.3 CONNECTIONS............................................................................................................. 13
2.3.1 Integrated Power Input Module................................................................................ 14
2.3.2 J01 Feed Control....................................................................................................... 15
2.3.3 J02 RS 232................................................................................................................ 16
2.3.4 SD Card Slot............................................................................................................. 16
2.3.5 J03 GB Ethernet........................................................................................................ 17
2.3.6 IF Inputs.................................................................................................................... 18
2.3.7 General Information.................................................................................................. 19
SECTION 3 OPERATING INSTRUCTIONS..........................................................21
3.1 CONTROLS AND INDICATORS................................................................................ 21
3.1.1 Status LED’s............................................................................................................. 21
3.1.2 Push Button Switches ............................................................................................... 22
3.1.3 LCD Display............................................................................................................. 23
3.2 CONFIGURING THE DEMODULATOR .................................................................. 24
3.2.1 Default Configuration............................................................................................... 24
3.2.2 Using Setup to Configure the Demodulator.............................................................. 25
3.3 NORMAL AND DIAGNOSTIC DISPLAY MODES.................................................. 30
3.3.1 Diagnostic and Status Displays................................................................................. 31
3.4 RECEIVING GRB DATA ............................................................................................. 37
3.5 READING THE SYSTEM STATUS DATA................................................................ 38
3.5.1 Status Message.......................................................................................................... 38
SECTION 4 THEORY OF OPERATION.................................................................43
4.1 RF FRONT END............................................................................................................. 44
4.2 DEMODULATOR SUB-SYSTEM................................................................................ 45
4.3 DATA INTERFACE SUB-SYSTEM............................................................................ 46
4.4 DATA PROCESSING SUB-SYSTEM.......................................................................... 47
4.5 CONTROLLER SUB-SYSTEM ................................................................................... 48
SECTION 5 MAINTENANCE...................................................................................49
5.1 FUSE REPLACEMENT................................................................................................ 49
5.1.1 Removing the Fuse Holder ....................................................................................... 50
5.2 PROBLEM RESOLUTION........................................................................................... 51

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LIST OF TABLES
Table 1 – GRB-200 Demodulator Specifications.........................................................9
Table 2 - J01 Connection Pin Out ..............................................................................15
LIST OF FIGURES
Figure 1 – GRB-200 Demodulator (Front View)...........................................................7
Figure 2 – GRB-200 Demodulator (Rear View)............................................................7
Figure 3 - GRB-200 Functional Diagram......................................................................8
Figure 4 - Rubber Foot Pads and Screws (Bottom View of Unit).............................11
Figure 5 - Rack Mounting ...........................................................................................12
Figure 6 - GRB-200 Rear Input Panel Connections...................................................13
Figure 7 - Integrated Power Input Module.................................................................14
Figure 8 – J01 Feed Control Connection...................................................................15
Figure 9 - J02 RS 232 Connection..............................................................................16
Figure 10 - SD Card Slot.............................................................................................16
Figure 11 – J03 GB Ethernet Connection..................................................................17
Figure 12 – J04 and J05 IF Input Connections..........................................................18
Figure 13 - GRB-200 Demodulator Controls and Indicators ....................................21
Figure 14 - Status LED's.............................................................................................21
Figure 15 - Push Button Switches .............................................................................22
Figure 16 - LCD Display..............................................................................................23
Figure 17 – Demodulator Mode Screenshot..............................................................25
Figure 18 – Demodulator Spectrum Configuration Screenshot...............................26
Figure 19 - Temperature Alarm Setting Screenshot.................................................27
Figure 20 - Exit Setup Screenshot .............................................................................27
Figure 21 - Demodulator Target Server IP Address Screenshot..............................28
Figure 22 - Demodulators IP Address Screenshot ...................................................29
Figure 23 - Normal Operation Display Screenshot...................................................30
Figure 24 - Basic Demodulator Status Screenshot...................................................31
Figure 25 - Demodulator Mode Spectrum and AGC Screenshot.............................32
Figure 26 - General Feed Power Status Screenshot.................................................33
Figure 27 - General GRB Feed Status Screenshot....................................................34
Figure 28 - GRB Feed Environmental Status Screenshot........................................35
Figure 29 - Demodulator Baseband Packet Status Screenshot...............................36
Figure 30 - Channel Access Data Unit (CADU) Structure.........................................37
Figure 31 - GRB-200 Functional Diagram..................................................................43
Figure 32 - GRB-200 Demodulator RF Section..........................................................44
Figure 33 - GRB-200 Demodulator Sub-System........................................................45
Figure 34 - GRB-200 Demodulator Data Interface Sub-System ...............................46
Figure 35 - GRB-200 Demodulator Data Processing Sub-System...........................47
Figure 36 - GRB-200 Demodulator Controller Sub-System......................................48
Figure 37 - Fuse Holder ..............................................................................................49
Figure 38 - Fuse Holder Release Tabs.......................................................................50
Figure 39 - Fuse Holder Removal...............................................................................50

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GRB-200 Demodulator
Figure 1 – GRB-200 Demodulator (Front View)
Figure 2 – GRB-200 Demodulator (Rear View)
SECTION 1 INTRODUCTION
The Quorum Communications GRB-200 (GOES-R) Dual Channel Demodulator is a key
component of the Quorum GOES-R GRB Reception System and has been designed to work
together with the Quorum Dual Polarity GRB Feed to provide the ultimate in GOES-R data
reception.
While many general purpose DVB-S2 receivers are available, the Quorum GRB-200 has
been designed specifically to support the requirements of both GRB reception and more
importantly to work within the expected hostile RF environment of the GRB L-band
downlink. Unlike traditional satellite video or data transmissions, the GRB downlink will
have potential close-in interfering signals from cell phone transmissions that present unique
challenges for error free reception. When used with the Quorum GRB Feed, potential
interfering signals are significantly reduced by distributed filtering and gain while
simultaneously providing high efficiency. The GRB-200 input provides additional filtering
using SAW filters of the exact GRB signal bandwidth to help with eliminating interfering
signals. A completely digital ASIC demodulator, designed specifically for industrial
applications provides near Shannon limit performance.

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The GRB-200 includes additional features to reduce the complexity of GRB reception and
data processing. These include simultaneous reception of the Left Hand and Right Hand
Circular downlinks in a single 1U rack mount case, integrated monitoring of the Quorum
GRB Feed status and inclusion of this data in the available status monitoring messages,
CADU frame formatting of the raw DVB-S2 data and streaming transmission of the CADU’s
on Gigabit Ethernet via UDP. The output of the GRB-200 can be used directly by readily
available community software to produce L1 and L2 data products.
Figure 3 - GRB-200 Functional Diagram
Detailed information for the GRB-200 is provided in Table 1.

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GRB-200 Demodulator Specifications
Radio Frequency
Inputs
2 - Simultaneous LHCP & RHCP
Input Frequency
140 MHz
Input Dynamic Range
-60 to -20 dBm
Image Rejection
> 100 dB
Input Impedance
50 ohms
Input Return Loss
> 15 dB
Input to Input Isolation
> 70 dB
Input Filter(s)
SAW Filter
Input Bandwidth
14 MHz @ 3 dB, 17 MHz @ 40 dB
LO Frequency
140 MHz in quadrature
IF Frequency 0 IF quadrature I and Q, digital demodulation
Demodulator
Basic Demodulator Structure
Advanced ASIC based digital demodulation,
DVB-S2 standard compliant
GRB Modes / Decoding Supported
QPSK 9/10 symbol rate 8.665938 Msps
8PSK 2/3 symbol rate 7.825768 Msps
FEC Supported
LDPC / BCH
GRB Coding and Modulation
CCM (Constant Coding and Modulation)
Implementation Loss
Near Shannon-limit
Typical Eb/No for QEF Performance
(QEF = PER better than 1E-6) 4.1 dB (QPSK 9/10)
3.9 dB (8PSK 2/3)
Transport Stream Support
Generic Transport Stream For Space Data
Packets
Matched Filtering 0.25 roll-off factor
Data / Status Interface
GB Ethernet, CADU packets via UDP
Receive Signal Strength Indicator (RSSI)
DC voltage output for remote antenna
alignment
Electrical / Mechanical
Supply Voltage / Power Universal 100-240 VAC, 47 to 63 Hz, <40W
Quorum GRB Feed Support +24 VDC @500mA to power feed RS-485 to
monitor feed status
Size 19” rack standard, 1U high, 10” deep
Weight 10 lbs.
Operating Temperature 0 – 50 °C (32 to 122 °F)
Table 1 – GRB-200 Demodulator Specifications

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Do not place anything on top of the GRB-
200 that prevents air
circulation/ventilation.
SECTION 2 INSTALLATION
The GRB-200 is built in a 1U enclosure that can be mounted in a rack or used on a desktop.
It is designed to operate in a standard office environment.
2.1 DESKTOP USE
Four rubber foot pads must be installed on the bottom of the GRB-200 for desktop
use (see Figure 4).
Rubber
Foot Pads and
#8 8/32 x 1/4 screws (4)
Figure 4 - Rubber Foot Pads and Screws (Bottom View of Unit)
The GRB-200 requires a minimum clearance of five (5) centimeters (2 inches) for
ventilation/airflow. Placing a Orbital Systems, Ltd. HRD or LRD receiver on top
of the GRB-200 is permitted if the unit also has mounting feet installed.

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Provide a minimum of 1U of space above and below the GRB-200 for
airflow/ventilation.
2.2 RACK USE
The GRB-200 is designed for installation in a standard 48-centimeter-wide rack
with a depth of 61 to 71 centimeters (19 x 24 to 28 inches). To mount the GRB-
200 in a rack, remove the four rubber foot pads and screws, and then attach the
rack supports using the fasteners shown in Figure 5. Mount the GRB-200 with
rack supports into the rack enclosure.
#8 8/32 x 3/8 Screws
with split ring and
washer (7)
Figure 5 - Rack Mounting

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2.3 CONNECTIONS
Figure 6 - GRB-200 Rear Input Panel Connections
The following connections are located on the rear panel of the GRB-200
Demodulator
•AC Power Input (Integrated Power Input Module)
•J01 – Feed Control (MS-Type Connection)
•J02 – RS 232 (DB9 Connection)
•SD Card Slot
•J03 – GB Ethernet (CAT-5e or CAT-6)
•J04 – LHCP IF Input (N-Type Connection)
•J05 – RHCP IF Input (N-Type Connection)

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Do not apply the power until all other connections to the GRB-200 have
been completed.
Integrated Power Input Module2.3.1
Figure 7 - Integrated Power Input Module
The GRB-200 contains a universal power supply that supports power input
voltages from 100 to 240 VAC at 47 to 63 Hz. The power input is a standard
IEC C-13 type. The GRB-200 usually is supplied with the appropriate power
cord for the user’s location. In some circumstances, however, the power cord
cannot be supplied and the user must provide it. The user must obtain a power
cord rated at 6A for local use.
Before 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 GRB-200 power plug. Plug the cord into a power source.
The GRB-200 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.

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J01 Feed Control2.3.2
Figure 8 – J01 Feed Control Connection
The Quorum GRB Reception Systems are provided with a pre-made
interconnect cable for the Quorum GRB Feed. Connect this cable between the
GRB Feed and the J1 Feed Control connector on the rear of the GRB
Demodulator.
J01 (PT06J-12-10S) Connection Pin-Out
Wire Color Purpose GRB-200 Demodulator
(J01)Pin Letter
Red + 24 VDC A
Black Ground B
Yellow + 24 VDC C
Brown Ground D
Orange RS 485 + E
Violet RS 485 - F
Blue RSSI DCV G
Drain - Silver Case Ground H
Not Used J
Not Used K
Table 2 - J01 Connection Pin Out

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J02 RS 2322.3.3
Figure 9 - J02 RS 232 Connection
The RS-232 connection is not used for normal operation. It is provided for test
and diagnostic use during manufacture. No connection should be made to J02.
SD Card Slot2.3.4
Figure 10 - SD Card Slot
The SD Card Slot is not used for normal operation. It is provided for test and
diagnostic use during manufacture. Do not insert an SD Card in this slot as it
could possibly interfere with the normal operation of the demodulator.

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J03 GB Ethernet2.3.5
Figure 11 – J03 GB Ethernet Connection
The GRB-200 transmits the received data and status information via UDP over
a gigabit Ethernet connection. This interface is designed to use only static IP
addresses and to connect directly to a server used to process the received data.
It is also possible to connect the GRB-200 to a gigabit Ethernet switch and set
it to transmit multicast UDP messages to multiple servers simultaneously. In
any case, the GRB-200 should not be connected to a general purpose network
and should only be used with a direct connection to associated data processing
servers to ensure that packets are not lost.
Connect this to your server using an appropriate Cat 5e or Cat 6 cable intended
for use with gigabit Ethernet and configure your server to support gigabit
connectivity.

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IF Inputs2.3.6
Figure 12 – J04 and J05 IF Input Connections
The Quorum GRB Reception system is provided with pre-cut and terminated
IF cables appropriate for the installation site. Route the supplied cables
between the GRB Feed and the J04 and J05 IF inputs. Be sure to match the
LHCP and RHCP outputs of the feed to the LHCP and RHCP inputs of the
GRB Demodulator. The GRB Demodulator outputs the LHCP and RHCP data
to different UDP ports based on the physical connection to J04 and J05. If
these are swapped, you can tell by looking at the Virtual Channel ID field in
the Transfer Frame Primary Header Field in the transmitted CADU’s.
Reference the GOES-R Product Definition and Users Guide for additional
information.

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General Information2.3.7
Proper data interface operation requires matching the signal types and
polarities of the GRB-200 to the input requirements of the interface. Refer to
SECTION 3 for this information.
After the GRB-200 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 GRB-200 is mounted in a rack, using
plastic ties to fasten the cables to the rails is recommended.

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