MRC MDR-2 Manual

Operator’s Guide
Portable 2-Input Diversity Receiver
MDR-2
Manual Part No. 400526-1
Rev. B December 2007

Notices
Notices Notices-iMDR-2 Operator’s Guide
About This Manual
Part number 400526-1
Revision B December 2007
The information in this manual applies to the Microwave Radio
Communications (MRC) MDR-2 Portable 2-Input Diversity
Receiver system.
Copyright
The information in this manual may only be reproduced by the
purchaser strictly for its own internal use to the extent required
for its use of the product, and shall only be made available to
purchaser's employees who need access to this material. No
part of this material, nor any copies hereof, shall in any manner
be disclosed, disseminated, or made available by the purchaser
or its employees to any other person, firm, or entity without the
express prior written consent of Microwave Radio
Communications, nor shall the same in any manner be modified
or published for resale without the express prior written
authorization of Microwave Radio Communications.
© 2007 Microwave Radio Communications
Microwave Radio Communications
101 Billerica Avenue - Bldg. 6
North Billerica, MA 01862-1256 USA
TEL: [phone]
978.671.5700
FAX: [phone]
Printed in U.S.A.
Proprietary Material
The information and design contained within this manual was
originated by and is the property of Microwave Radio
Communications. Microwave Radio Communications reserves
all patent proprietary design, manufacturing, reproduction use,
and sales rights thereto, and to any articles disclosed therein,
except to the extent rights are expressly granted to others. The
foregoing does not apply to vendor proprietary parts.
Microwave Radio Communications has made every effort to
ensure the accuracy of the material contained in this manual at
the time of printing. As specifications, equipment, and this
manual are subject to change without notice, Microwave Radio
Communications assumes no responsibility or liability
whatsoever for any errors or inaccuracies that may appear in this
manual or for any decisions based on its use. This manual is
supplied for information purposes only and should not be
construed as a commitment by Microwave Radio
Communications.
Quality Certification
Microwave Radio Communications is certified to ISO 9001:2000.
Authorized EU representative: Vislink PLC.

Notices Notices-iiMDR-2 Operator’s Guide
Conventions
Pay special attention to information marked in one of the
following ways:
WARNING Follow WARNINGS closely to prevent
personal injury or death.
CAUTION Follow CAUTIONS to prevent damage to
the equipment.
Note Notes provide additional information to assist you
in using and maintaining the equipment.
Waste Electrical and Electronic
Equipment
The crossed out dustbin symbol on the product
indicates that the product must not be disposed of
with other waste at the end of its life cycle. Instead, it
is the user’s responsibility to dispose of the waste
equipment by handing it over to a designated collection point for
the recycling of Waste Electrical and Electronic Equipment
(WEEE). For more information about where you can drop off
your waste equipment for recycling, please contact your local
government office.
Except for this notification and the proper marking of products
with the appropriate symbol, Microwave Radio Communications
disclaims responsibility for the disposal of its products per the
WEEE directive.
Symbols Used
The following symbols are used on the equipment:
Symbol Meaning
WARNING: General Warning. Risk of Danger
WARNING: Risk of Electric Shock
CAUTION: Electrostatic Discharge. Possible
Damage to Equipment
-OR-
Fuse - Identifies fuses or their location.
Frame or Chassis Ground - Identifies the frame or
chassis terminal.
Earth Ground - Identifies the earth ground terminal
Protective Earth Ground - Identifies any terminal
which is intended for connection to an external
conductor for protection against electric shock in
case of a fault, or the terminal on a protective earth
electrode.

Notices Notices-iiiMDR-2 Operator’s Guide
On-Line Viewing
Text displayed as blue contains a hypertext link. Click on the
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Warranty Information
Products Manufactured by MRC
a. Products manufactured by MRC are warranted against
defects in material and workmanship for a period of two (2) years
from date of delivery, as evidenced by MRC's packing slip or
other transportation receipt (unless otherwise noted).
b. MRC's sole responsibility under this warranty will be to either
repair or replace, at its option, any component which fails during
the applicable warranty period because of a defect in material or
workmanship, provided Buyer has promptly reported same to
MRC in writing. All replaced products and parts will become
MRC's property.
c. MRC will honor the warranty at the repair facility designated
by MRC. It is Buyer's responsibility to return, at its expense, the
allegedly defective product to MRC. Buyer must obtain a Return
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Material Authorization (RMA) number and shipping instructions
from MRC prior to returning any product under warranty.
Transportation charges for the return of the product to Buyer will
be paid by MRC within the United States. For all other locations,
the warranty excludes all costs of shipping, customs clearance
and other related charges. If MRC determines that the product is
not defective within the terms of this warranty, Buyer will pay
MRC all costs of handling, transportation, and repairs at the then
prevailing repair rates.
d. All the above warranties are contingent upon proper use of
the product. These warranties will not apply (1) if adjustment,
repair, or product or parts replacement is required because of
accident, unusual physical, electrical or electromagnetic stress,
neglect, misuse, failure of electric power, environmental controls,
transportation, failure to maintain properly or otherwise in
accordance with MRC specifications, or abuses other than
ordinary use; (2) if the product has been modified by Buyer or
has been repaired or altered outside MRC's repair facility, unless
MRC specifically authorizes such repairs or alterations in each
instance; or (3) where MRC serial numbers, warranty data or
quality assurance decals have been removed or altered.
e. Equipment shipped FOB from Microwave Radio
Communications shall become the property of the buyer upon
delivery and receipt from the carrier. Any damage in shipment
should be handled by the buyer directly with the carrier.
Immediately request the carrier’s inspection upon evidence of
damage during shipment. Do not return any Microwave Radio
Communications product to the factory until a Return Material
Authorization (RMA) number and shipping instructions have
been provided.
f. No person, including any dealer, agent or representative of
MRC is authorized to assume for MRC any other liability on its
behalf except as set forth herein. If any payment is due MRC for

Notices Notices-ivMDR-2 Operator’s Guide
services performed hereunder, it will be subject to the same
payment terms as the original purchase.
Products Manufactured By Others
For products not manufactured by MRC, the original
manufacturer's or licensor's warranty will be assigned to Buyer to
the extent permitted by the manufacturer or licensor and is in lieu
of any other warranty, expressed or implied. For warranty
information on a specific product, a written request should be
made to MRC.
All Products
THE FOREGOING WARRANTIES AND REMEDIES ARE
EXCLUSIVE AND ARE IN LIEU OF ALL OTHER EXPRESS OR
IMPLIED WARRANTIES, OBLIGATIONS, AND LIABILITIES ON
THE PART OF MRC. EXCEPT FOR THE EXPRESS
WARRANTIES STATED HEREIN, MRC DISCLAIMS ALL
WARRANTIES ON PRODUCTS FURNISHED HEREUNDER,
INCLUDING, WITHOUT LIMITATION, ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. MRC WILL HAVE NO
RESPONSIBILITY FOR ANY PARTICULAR APPLICATION
MADE OF ANY EQUIPMENT.
Any description of equipment, whether in writing or made orally
by MRC or its agents, specification sheets, models, bulletins,
drawings, or similar materials used in connection with Buyer's
order are for the sole purpose of identifying the equipment and
will not be construed as an express warranty. Any suggestions
by MRC or its agents regarding use, application, or suitability of
the equipment will not be construed as an express warranty. No
warranties may be implied from any course of dealing or usage
of trade. Buyer agrees that the exclusion of all warranties, other
than those expressly provided herein, is reasonable.

Contents
Contents Contents-1MDR-2 Operator’s Guide
Introduction - - - - - - - - - - - - - - - - - - - - - - - - - 1-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 1-1
How to Use This Manual - - - - - - - - - - - - - - - - - - - - 1-1
What This Manual Covers - - - - - - - - - - - - - - - - - - - 1-1
How They’re Organized - - - - - - - - - - - - - - - - - - - - - 1-1
For Whom It’s Written - - - - - - - - - - - - - - - - - - - - - - 1-2
Related Documents - - - - - - - - - - - - - - - - - - - - - - - - 1-2
Ordering Documentation - - - - - - - - - - - - - - - - - - - - 1-2
Calling for Service - - - - - - - - - - - - - - - - - - - - - - - - - 1-3
Supported Repairs - - - - - - - - - - - - - - - - - - - - - - - - 1-3
Tell Us What You Think! - - - - - - - - - - - - - - - - - - - - 1-3
Product Description- - - - - - - - - - - - - - - - - - - 2-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 2-1
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1
Options - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-2
Power Options - - - - - - - - - - - - - - - - - - - - - - - - - 2-2
Mounting and Deployment Options - - - - - - - - - - 2-2
System Integration - - - - - - - - - - - - - - - - - - - - - - 2-3
System Components - - - - - - - - - - - - - - - - - - - - - - - 2-3
MDR-2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-3
Block Down Converters- - - - - - - - - - - - - - - - - - - 2-4
STRATA RX Remote Control Panel - - - - - - - - - - 2-4
STRATA AC to DC Power Supply - - - - - - - - - - - 2-5
For More Information - - - - - - - - - - - - - - - - - - - - - - - 2-5
Routine Operation - - - - - - - - - - - - - - - - - - - - 3-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 3-1
Overview of Controls, Indicators and Connectors - - - 3-1
MDR-2 Controls, Indicators, and Connectors - - - 3-1
Block Down Converter Indicators and Connectors 3-4
ACU Controls, Indicators, and Connectors - - - - - 3-5
Preparing for Operation - - - - - - - - - - - - - - - - - - - - - 3-6
Mobile Installation - - - - - - - - - - - - - - - - - - - - - - - 3-6
Portable Deployment - - - - - - - - - - - - - - - - - - - - - 3-6
Powering the MDR-2 - - - - - - - - - - - - - - - - - - - - - 3-9
Using the Display Screens - - - - - - - - - - - - - - - - - - 3-10
Monitoring Options - - - - - - - - - - - - - - - - - - - - - - - 3-11
Monitoring Link Quality (LQ) - - - - - - - - - - - - - - 3-12
LQ Action Levels - - - - - - - - - - - - - - - - - - - - - - - 3-13
What Actions to Take- - - - - - - - - - - - - - - - - - - - 3-14
Monitoring Bit Error Ratio (BER) - - - - - - - - - - - 3-15
Monitoring Signal-to-Noise Ratio (SNR)- - - - - - - 3-16
Control Operations - - - - - - - - - - - - - - - - - - - - - - - - 3-17
Changing a Preset- - - - - - - - - - - - - - - - - - - - - - 3-17
Setting a Channel and Offset - - - - - - - - - - - - - - 3-19
Set OFDM Bandwidth - - - - - - - - - - - - - - - - - - - 3-20
Select DC On Coax - - - - - - - - - - - - - - - - - - - - - 3-20
Front Panel vs. MDR Configuration Utility Settings - 3-21
Troubleshooting - - - - - - - - - - - - - - - - - - - - - 4-1
Chapter Overview - - - - - - - - - - - - - - - - - - - - - - - - - 4-1
Status LED - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1
Display Messages - - - - - - - - - - - - - - - - - - - - - - - - - 4-2
Error Codes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-3
Error Status - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-3
Primary Error Code - - - - - - - - - - - - - - - - - - - - - - 4-3
Operational Problems - - - - - - - - - - - - - - - - - - - - - - - 4-6
Channels and Frequencies - - - - - - - - - - - - - A-1
Appendix Overview - - - - - - - - - - - - - - - - - - - - - - - - A-1
Initial Factory Presets - - - - - - - - - - - - - - - - - - - - - - - A-1
1.7 to 1.85 GHz Channel Plan - - - - - - - - - - - - - - A-1
1.9 to 2.2 GHz Channel Plan - - - - - - - - - - - - - - - A-2
2.2 to 2.5 GHz Channel Plan - - - - - - - - - - - - - - - A-2
2.3 to 2.7 GHz Channel Plan - - - - - - - - - - - - - - - A-2
3.4 to 3.6 GHz Channel Plan - - - - - - - - - - - - - - - A-2
3.4 to 3.8 GHz Channel Plan - - - - - - - - - - - - - - - A-3

Contents Contents-2MDR-2 Operator’s Guide
3.5 to 3.9 GHz Channel Plan - - - - - - - - - - - - - - - A-3
4.4 to 4.7 GHZ Channel Plan- - - - - - - - - - - - - - - A-3
4.8 to 5.0 GHz Channel Plan - - - - - - - - - - - - - - - A-4
US 2 GHz Reallocation - 12 MHz Channel Plan - - - - A-4
Glossary - - - - - - - - - - - - - - - - - - - - - - - - - - - B-1
Link Quality - - - - - - - - - - - - - - - - - - - - - - - - - C-1
Appendix Overview - - - - - - - - - - - - - - - - - - - - - - - - C-1
Analog vs. Digital Systems - - - - - - - - - - - - - - - - - - - C-1
Understanding Link Quality - - - - - - - - - - - - - - - - - - C-2
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - C-2
The LQ Scale - - - - - - - - - - - - - - - - - - - - - - - - - - C-2
LQ and Signal Quality - - - - - - - - - - - - - - - - - - - - C-3
LQ Action Levels - - - - - - - - - - - - - - - - - - - - - - - C-3
What Actions to Take - - - - - - - - - - - - - - - - - - - - C-4
Technical Background: LQ Factors - - - - - - - - - - - - - C-5
Received Signal Strength and Signal-to-Noise
Ratio - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - C-5
Forward Error Correction - - - - - - - - - - - - - - - - - C-5
Guard Interval - - - - - - - - - - - - - - - - - - - - - - - - - C-5
Bandwidth - - - - - - - - - - - - - - - - - - - - - - - - - - - - C-6
Bit Error Rate - - - - - - - - - - - - - - - - - - - - - - - - - - C-6
Maximal Ratio Combining - - - - - - - - - - - - - - D-1
Appendix Overview - - - - - - - - - - - - - - - - - - - - - - - - D-1
Antenna Correlation- - - - - - - - - - - - - - - - - - - - - - - - D-1
Maximal Ratio Combining - - - - - - - - - - - - - - - - - - - D-1
Specifications - - - - - - - - - - - - - - - - - - - - - - - E-1

1
Introduction 1-1MDR-2 Operator’s Guide
Introduction
1.1 Chapter Overview
This chapter will introduce you to the Operator’s Guide - what it
covers, how it’s organized, and for whom it’s written.
1.2 How to Use This Manual
This manual was prepared to be viewed on a Windows®-based
PC. A pdf file for this manual is provided on the CD ROM
delivered with each MDR-2 Portable 2-Input Diversity Receiver
system. The CD ROM contains pdf files for the Operator’s
Guide, the Technical Reference Manual, and the Quick
Reference Cards. Hardcopies of the Operator’s Guide, the
Technical Reference Manual, and the Quick Reference Cards
are also delivered with each MDR-2.
Viewing of this manual on-line requires Acrobat®or Adobe®
Reader®, Version 5.0 and later. Click on the following icon to
download your FREE copy of Adobe®Reader®.
When viewing this manual on-line, text displayed as blue
contains a hypertext link. Click on the blue hypertext link to
jump to that destination. If the destination link is also blue, click
on the blue destination link to return.
1.3 What This Manual Covers
This manual covers how to operate the MDR-2 Portable 2-Input
Diversity Receiver system.
The MDR-2 system consists of the following:
• Portable 2-Input Diversity Receiver
• Two Block Down Converters
For mobile applications, such as in a vehicle or in an aircraft, the
MDR-2 is usually mounted in a bulkhead or compartment. For
portable operation, the MDR-2 can be mounted on a tripod.
The MDR-2 operates on DC power, supplied externally, from
+10.5 to +36 VDC. This power can be supplied from an optional
STRATA AC to DC Power Supply (ACU) or from another DC
power source.
1.4 How They’re Organized
The manuals for the MDR-2 are organized as follows:
Chapter Operator’s
Guide
Technical
Reference
Manual
Introduction
Product Description
Routine Operation
Troubleshooting

Introduction 1-2MDR-2 Operator’s Guide
Note The Technical Reference Manual contains
everything in the Operator’s Guide, plus additional
technical content.
1.5 For Whom It’s Written
This manual is intended for use by personnel assigned to
operate the MDR-2. Users of this manual should already be
familiar with basic concepts of radio, video, and audio.
Advanced Operation
Installation
Repair
Replacement Parts
Theory of Operation
Channels & Frequencies
Glossary
Configurator Reference
Link Quality
Maximum Ratio
Combining Techniques
Specifications
1.6 Related Documents
• Portable 2-Input Diversity Receiver Technical Reference
Manual
(part no. 400527-1)
• Portable 2-Input Diversity Receiver Quick Reference Card
(part no. 400528-1)
1.7 Ordering Documentation
Any of the above manuals may be ordered by contacting MRC
Customer Service:
Business Hours: Monday - Thursday
8:00 AM - 7:00 PM Eastern Time (US)
(0800 - 1900 hrs US ET)
Friday
8:00 AM - 5:00 PM Eastern Time (US)
(0800 - 1700 hrs US ET)
Telephone: [phone] (Press 3)
978-671-5700 (Press 3)
Fax: [phone]
E-mail [e-mail]
When contacting Customer Service, please have the following
information available:
• Model number and serial number of the unit. This is
located on a label on the bottom of each unit
• Approximate purchase date

Introduction 1-3MDR-2 Operator’s Guide
• Radio version, which appears on the MDR-2
alphanumeric display at startup
- OR -
• Module versions displayed on the Radio page of the MDR
Configuration Utility, when the MDR Configuration Utility
software is connected to the MDR-2
1.8 Calling for Service
MRC Technical Support is available 24 hours a day, 7 days a
week. During regular business hours you can reach our expert
staff directly.
Business Hours: Monday - Friday
8:00 AM - 7:00PM Eastern Time (US)
(0800 - 1900 hrs US ET)
Telephone: [phone] (Press 4)
978-671-5700 (Press 4)
Fax: [phone]
E-mail: [e-mail]
After regular business hours and on weekends and holidays, you
can also reach our expert staff as follows:
Telephone: [phone]
Your call will be automatically forwarded to the on-call Technical
Support specialist.
When contacting Technical Support, please have the following
information available:
• Model number and serial number of the unit. This is
located on a label on the bottom of each unit
• Approximate purchase date
• Radio version, which appears on the MDR-2
alphanumeric display at startup
- OR -
• Module versions displayed on the Radio page of the MDR
Configuration Utility, when the MDR Configuration Utility
software is connected to the MDR-2
1.9 Supported Repairs
The MDR-2 and Block Down Converters require specialized test
equipment to calibrate amplitude and frequency characteristics
after repair. In addition, sealing the MDR-2 and the Block Down
Converter enclosures after repair requires exacting techniques
and special fixtures to ensure weather resistance of the units.
There are NO supported field repairs for either the MDR-2 or
the Block Down Converters.
Return the entire unit(s) for factory repair.
If you attempt field repair, you risk damaging your
equipment. If your equipment is under warranty, you may also
affect your warranty coverage.
1.10 Tell Us What You Think!
We’d appreciate any comments or suggestions you have about
this manual. The more feedback we get, the better the manuals
get!

Introduction 1-4MDR-2 Operator’s Guide
If you’re viewing this manual electronically, it’s easy - just click on
the link below to send us an E-mail.
Or, you can E-mail our Technical Support team at:
[e-mail]
Be sure to tell us what product you’re writing about, and which
manual - the Operator’s Guide, the Quick Reference Card, or the
Technical Reference Manual.
Feedback

2
Product Description 2-1MDR-2 Operator’s Guide/Tech Ref Manual
Product Description
2.1 Chapter Overview
This chapter provides an overall description of the MDR-2
Portable 2-Input Diversity Receiver system, its components,
options, and capabilities.
Here are the topics covered:
Topic Page
Description 2-1
Options 2-2
Remote Control Options 2-2
Antenna Options 2-2
Frequency Bands 2-2
Block Down Converters 2-2
Power Options 2-2
Mounting and Deployment Options 2-2
Mobile Installation 2-2
Portable Deployment 2-3
System Integration 2-3
System Operation 2-3
System Configuration 2-3
System Components 2-3
MDR-2 2-3
Block Down Converters 2-4
STRATA RX Remote Control Panel 2-4
STRATA AC to DC Power Supply 2-5
For More Information 2-5
2.2 Description
The MDR-2 system is a highly reliable, flexible, and compact
portable microwave diversity receiver ideal for tripod or mobile
installations. The MDR-2 is ideal for Electronic News Gathering
(ENG), Digital Video Broadcast (DVB), mobile communication,
wireless airborne networks, and Outside Broadcast (OB)
systems.
The MDR-2 system consists of the MDR-2 Portable 2-Input
Diversity Receiver, two Block Down Converters, and optional
omni antennas. See Figure 2-1.
Figure 2-1: MDR-2 System Block Diagram

Product Description 2-2MDR-2 Operator’s Guide/Tech Ref Manual
The MDR-2 architecture allows you flexibility in configuration,
siting, and operation. MDR-2 key features are as follows:
• Supports Maximal Ratio Combining (MaxRC) diversity
technique
• Utilizes two UHF inputs for tuning
• MPEG decoding and COFDM demodulation
• NTSC and PAL system decoding capabilities
• Block Down Converters compatible with standard omni
and directional antennas
2.2.1 Options
MDR-2 options (typically) consist of the following:
Remote Control Options For portable mobile or airborne
operations, the MDR-2 may be controlled by the optional
STRATA RX Remote Control Panel. The STRATA Remote
Control Panel is mounted in a mobile rack or in an aircraft
instrument panel and is connected via an RS-232 cable between
the Remote Control Panel and the MDR-2.
Antenna Options The MDR-2 is compatible with the MRC
family of omnidirectional receiver antennas. Contact your Sales
Representative to explore antenna choices available.
Frequency Bands The MDR-2 can be ordered to operate on
the following frequency bands:
1.7 to 1.85 GHz 3.4 to 3.8 GHz
1.9 to 2.2 GHz 3.5 to 3.9 GHz
2.2 to 2.5 GHz 4.4 to 4.7 GHz
2.3 to 2.7 GHz 4.8 to 5.0 GHz
3.2 to 3.6 GHz
Block Down Converters MRC Block Down Converters are
available to operate in the following frequency bands.
1.7 to 1.85 GHz 3.4 to 3.8 GHz
1.9 to 2.2 GHz 3.5 to 3.9 GHz
2.2 to 2.5 GHz 4.4 to 4.7 GHz
2.3 to 2.7 GHz 4.8 to 5.0 GHz
3.2 to 3.6 GHz
The MDR-2 may only be used with the MRC Block Down
Converters. The Block Down Converters must be ordered for
the specific frequency band that you will be using for normal
operation.
2.2.2 Power Options
The MDR-2 operates on +10.5 to +36.0 VDC power, supplied
externally. This DC power can be supplied by the optional
STRATA AC to DC Power Supply (ACU) or from another DC
power source. Power to the Block Down Converters is provided
via DC on coax from the MDR-2.
2.2.3 Mounting and Deployment Options
The MDR-2 offers a number of options for mobile or portable
deployment applications.
For more details on installation of the MDR-2 in various
applications, refer to the “Installation” Chapter on page 6-1 (part
of the Portable 2-Input Diversity Receiver Technical Reference
Manual only).
Mobile Installation For mobile applications such as in a vehicle
or an aircraft, the MDR-2 is usually mounted in an MRC fixed
mounting bracket and is installed in a bulkhead or compartment.

Product Description 2-3MDR-2 Operator’s Guide/Tech Ref Manual
The cabling is permanently installed and power comes from
vehicle or aircraft power.
Portable Deployment In portable applications, the MDR-2 will
be moved from place to place and set up each time and will
usually be mounted on an MRC Quick Release Mount for easy
attachment to an MRC tripod. The Quick Release Mount
connects to a Dovetail Adapter Plate machined into the MRC
tripod mount. Other mounting options are available.
Refer to the “Installation” Chapter on page 6-1 (part of the
Portable 2-Input Diversity Receiver Technical Reference Manual
only) for additional information.
Power, antenna, and audio/video connections are removed at
the end of each deployment.
2.2.4 System Integration
System Operation Once the MDR-2 is connected and powered
up, system settings can be selected or modified from the MDR-2
front panel.
System Configuration The MDR-2 offers two levels of system
configurations designed to match the needs of different
personnel.
For the field operator, the MDR-2 has up to nine Presets that can
be selected from the front panel. Each Preset controls key
parameters such as channel and bandwidth.
For the advanced operator and technical staff, the MDR
Configuration Utility software allows complete control of
parameters in the MDR-2. The MDR Configuration Utility
software runs on a Windows-based PC and connects to the
MDR-2 via an RS-232 null modem cable.
Interfacing a PC to the MDR-2 provides complete control of the
MDR-2 Presets. You can read the current settings, program new
settings, or return the units to their factory default settings.
2.3 System Components
This section will provide more details about each of the
components of a (typical) MDR-2 system:
• MDR-2 Portable 2-Input Diversity Receiver
• Block Down Converters
• STRATA RX Remote Control Unit
• STRATA AC to DC Power Supply (ACU)
For details on connections between the MDR-2 components,
refer to the “Installation” Chapter on page 6-1 (part of the
Portable 2-Input Diversity Receiver Technical Reference Manual
only).
2.3.1 MDR-2
In telecommunications, diversity reception is one method of
improving the reception of transmitted signals by receiving and
processing multiple versions of the same signal.
The MDR-2, as shown in Figure 2-2, is a versatile, portable,
digital diversity receiver system designed to accept two
microwave radio signals. Using two MRC Block Down
Converters, multipath microwave signals are received,
combined, and converted to a single output signal.
Figure 2-2: MDR-2
MDR-2

Product Description 2-4MDR-2 Operator’s Guide/Tech Ref Manual
The MDR-2 utilizes two Block Down Converters and two
separate antennas to receive transmitted signals. The Block
Down Converters are connected to the MDR-2 SIGNAL A and
SIGNAL B rear panel input connectors via coaxial cables. Only
MRC Block Down Converters can be used with the MDR-2.
Using two omni receiving antennas helps eliminate multipath
distortion. The diversity receiver receives the transmitted signal
on two antennas having different locations.
In situations where one antenna might experience poor
reception, the second antenna might not experience the same
poor reception. By using the MDR-2 receiver system, the right
antenna is chosen at the right moment and the MDR-2 operates
as though it receives a continuous quality signal.
With the MDR-2 receiver system, each signal has an individual
demodulator used to perform both the Fast Fourier Transform
(FFT) and channel equalization processes. Each demodulator
makes use of pilot carriers and other information about the input
signal to assess the condition of each individual carrier within the
COFDM spectrum. A weighting factor is then allocated relating
to the degradation of that carrier.
A diversity algorithm is then used to assess the weighting factors
for each input and can decide the ratio by which input carriers
are combined to produce the final output signal. This allows re-
construction of each individual carrier, providing the best
possible signal after demodulation and before the subsequent
error correction stages.
After demodulation and decoding, the receiver provides outputs
consisting of composite video (CV), audio, and digitized data
streams in ASI/SDI versions.
2.3.2 Block Down Converters
Two Block Down Converters, as shown in Figure 2-3, are used
with the MDR-2 receiver system. Each Block Down Converter
down-converts received RF frequency bands from 1.7 to 5.0
GHz to UHF bands of 448 to 861 MHz, a bandwidth of 413 MHz.
The Block Down Converter RF INPUT connector connects either
directly or via a type “N” 50 ohm coaxial cable to an omni
receiving antenna. The Block Down Converter IF OUTPUT
connector connects to the MDR-2 INPUT A or INPUT B TNC
connectors via 75 ohm coaxial cables. The coaxial cables
supplies DC on coax from the MDR-2 to provide power to the
Block Down Converter.
Figure 2-3: Block Down Converters
2.3.3 STRATA RX Remote Control Panel
For mobile or airborne operations, the STRATA RX Remote
Control Panel, as shown in Figure 2-4 on page 2-5, provides
simplified receive operations by allowing the operator to select
pre-configured Presets, channels, and offsets, depending upon
the required operating mode.
RF INPUT
PWR
A
B
BAND A/B
IF OUTPUT

Product Description 2-5MDR-2 Operator’s Guide/Tech Ref Manual
Figure 2-4: STRATA RX Remote Control Panel
The STRATA RX Remote Control Panel provides instrument
panel remote control of the MDR-2 for vehicle or aircraft
operations and features nine selectable Presets. The STRATA
RX Remote Control Panel is connected to the MDR-2 via a
standard null modem cable.
For additional information, refer to the STRATA Remote Control
Panel Operator’s Guide (part no. 400489) or contact your Sales
Representative.
2.3.4 STRATA AC to DC Power Supply
For fixed or portable deployment applications, the MDR-2
System may be powered by the optional STRATA AC to DC
Converter (ACU). See Figure 2-5. The ACU is offered in several
different models, each featuring different voltage output levels.
For additional information, contact your Sales Representative.
The ACU installs as part of an integrated stack for either tripod or
fixed applications.
Figure 2-5: STRATA AC to DC Power Supply
2.4 For More Information
Additional detailed technical information about the MDR-2 is
contained in the Portable 2-Input Diversity Receiver Technical
Reference Manual. Specific topics contained in the Portable 2-
Input Diversity Receiver Technical Reference Manual are as
follows:
Topic Chapter
MDR Configuration Utility
Settings
See ”Advanced Operation” on
page 5-1
Connections to other
equipment
See ”Installation” on page 6-1
Installation See ”Installation” on page 6-1
Supported Repairs See ”Repair” on page 7-1
Repair Parts See ”Replacement Parts” on
page 8-1
Theory of Operation See ”Theory of Operation” on
page 9-1
OUTPUT
OUTPUT
< >
< >
DC
DC
Rear View
Front View

Product Description 2-6MDR-2 Operator’s Guide/Tech Ref Manual
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3
Routine Operation 3-1MDR-2 Operator’s Guide/Tech Ref Manual
Routine Operation
3.1 Chapter Overview
This chapter provides basic information that will enable you to
operate your MDR-2 Portable 2-Input Diversity Receiver.
Here are the topics covered:
Topic Page
Overview of Controls, Indicators and
Connectors
3-1
MDR-2 Controls, Indicators, and
Connectors
3-1
Block Down Converter Indicators and
Connectors
3-4
ACU Controls, Indicators, and
Connectors
3-5
Preparing for Operation 3-6
Mobile Installation 3-6
Portable Deployment 3-6
Powering the MDR-2 3-9
Using the Display Screens 3-10
Monitoring Options 3-11
Control Operations 3-17
Changing a Preset 3-17
Setting a Channel and Offset 3-19
Set OFDM Bandwidth 3-20
Select DC On Coax 3-20
Front Panel vs. MDR Configuration Utility
Settings
3-21
Information on settings made with the MDR Configuration Utility
software can be found in the “Advanced Operation” Chapter on
page 5-1 (part of the Portable 2-Input Diversity Receiver
Technical Reference Manual only).
For a summary of settings that can be made with the MDR-2
front panel control switch and which settings are made using the
MDR Configuration Utility software, see Section 3.7 on page 3-
21.
3.2 Overview of Controls, Indicators
and Connectors
This section describes the controls, indicators, and connectors
contained on the MDR-2 system.
3.2.1 MDR-2 Controls, Indicators, and
Connectors
Controls, indicators, and connectors contained on the MDR-2
are identified and described below. Topics covered are as
follows:
Topic Page
RS232 DB-9 Connector 3-2
Alphanumeric Display 3-2
Control Switch 3-2
Status LED 3-3
PWR Switch 3-3
DC ON COAX Switch 3-3
POWER Connector 3-4

Routine Operation 3-2MDR-2 Operator’s Guide/Tech Ref Manual
Each of these controls, indicators, and connectors are described
in more detail in the following paragraphs. Controls, indicators,
and connectors contained on the MDR-2 front panel are shown
in Figure 3-1.Controls, fuses, and connectors contained on the
MDR-2 rear panel are shown in Figure 3-2 on page 3-4.
Figure 3-1: Front Panel Controls, Indicators, and
Connectors
RS232 DB-9 Connector The RS232 DB-9 connector provides
connections for factory test or to a Windows-based PC when
using the MDR Configuration Utility software. The connector
also provides Wayside data connections.
Alphanumeric Display The MDR-2 front panel contains a two-
line by 12-character alphanumeric display. The display works in
conjunction with the control switch to allow you to monitor
SIGNAL OUT BNC Connector 3-4
ASI MON BNC Connector 3-4
INPUT A and INPUT B TNC
Connectors
3-4
AUDIO Connector 3-4
MDR-2
RS232
Connector
Alphanumeric
Display
Control
Switch
Status
LED
DC ON COAX
Switch
PWR
Switch
system status and to control system settings.
Control Switch Routine MDR-2 operating settings are
controlled by the front panel control switch. Turning the control
switch right (cw) or left (ccw) displays status and settings, and
pressing it in makes selections as described below:
Turning the control switch to the right (cw)
displays the Monitor options.
The Monitor options provide current status
of the MDR-2, including:
• Preset Number and Channel Frequency
• Modulation, Bandwidth, Forward Error
Correction, and Guard Interval
• Bit Error Rates for Channels 1 and 2
• Modulator Error Rates for Channels 1 and 2
• Signal to Noise Ratio for Channels 1 and 2
• COFDM Status (Lock or Unlock) for
Channels 1 and 2
• Transport Stream Status (Lock or Unlock)
• Video Output Setting (Composite Video or
SDI) and Video Data Status (Lock or Unlock)
• Audio A Data Status (Lock or Unlock) and
Audio Type (Analog/Digital, Stereo/Mono)
• Audio B Data Status (Lock or Unlock) and
Audio Type (Analog/Digital, Stereo/Mono)
• Color Bar Generator Setting (On or Off)
• System Errors.