Microwave Radio Communications DAR Plus Manual

Operator’s Guide
DAR Plus
Analog or Digital
Microwave Radio System
Appendix A - System Connections
Table of Contents
Section 1 - System Overview
Document: 400468-1
Revision C
September 2003
Section 2 - System Installation
Section 3 - Operating Controls
Section 4 - Summary Alarms
Appendix B - Modules
Appendix C - Frequency Settings
Software
Release
1.0

PROPRIETARY NOTICE
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.
To allow for the introduction of design improvements, specifications are subject to change without
notice.
©2003 Microwave Radio Communications
Printed in the U.S.A.
August 2003
Revision ECO Date
A March 2002
B 3143-2 August 2003
C 3203-2 September 2003
Microwave Radio Communications
101 Billerica Avenue – Bldg 6
North Billerica, MA 01862-1256
USA
TEL: [phone]
FAX: [phone]

Caution:
1. Read all of these instructions.
2. Save these instructions for later use.
3. Follow all warnings and instructions
marked on the units.
Read Instructions - All safety and
operating instructions should be carefully
read before operating the equipment.
Retain Instructions - The safety and
operating instructions should be retained
and stored in a convenient place for future
reference.
HeedWarnings - All warnings on this
equipment, and in the operating instructions
should be strictly adhered to.
Follow Instructions - All operating and user
instructions should be properly
implemented for optimum and safe
performance.
Cleaning - Do not use liquid cleaners or
aerosol cleaners.Instead, use only a damp
cloth for cleaning.
Attachments - Do not use attachments not
authorized by Microwave Radio
Corporation.Using unauthorized
attachments may create safety hazards or damage
the equipment.
Water and Moisture - Indoor equipment is
not designed to withstand water or moisture
beyond the limits noted in the product
specifications.
Accessories - Do not place equipment on
an unstable cart, stand, tripod, bracket, or
table.The product could fall, causing
serious personnel injury or damage the equipment.
Use only equipment recommended by Microwave
Radio Corporation.When mounting or installing the
equipment, follow the manufacturer's instructions.
Power Sources -The equipment should be
operated only from the type of power source
indicated on the unit, or in the operating
instructions. For 220 VAC operation, the proper
power cord must be used.
Grounding or Polarization - AC powered
versions of this product are equipped with a
3-wire plug with an integral grounding pin.
This plug fits into a standard, grounded power outlet.
If you are unable to insert the plug into the outlet,
contact your electrician to replace your obsolete
outlet. Do not defeat the safety purpose of the
grounded plug.
Power Cord Protection - Power supply
cords should be routed so that they are not
likely to be walked on or pinched by other
equipment items.Pay particular attention to cords at
plugs, convenience receptacles, and at the point
where they enter and exit the equipment.
Object or Liquid Entry - Never spill liquids
or insert objects of any kind through
openings in the equipment. Such actions
can result in fire or electric shock.
Damage Requiring Servic e - Unplug the
radio product from the power outlet and
contact service personnel when the
following conditions occur:
1. If the power supply cord or plug has been
damaged.
2. If liquid has been spilled in the equipment, or
objects have fallen into the equipment.
3. If the equipment does not operate normally by
following the operating instructions and adjusting
only those controls that are covered by the operating
instructions. Improperly adjusting or tampering with
controls not covered in the operating instructions
may result in damage to the equipment or require
extensive work by a qualified technician to restore
the radio to its normal operation.
When the equipment exhibits a distinct change in
performance indicating the need for service.
Replacement Parts - When replacing
parts is required, use only parts authorized
by Microwave Radio Corporation.
Unauthorized substitutions could result in fire,
electric shock, or damage to the equipment.
Safety Check - Upon completing any
service or repairs to the equipment, ensure
that safety checks are performed to
determine that the equipment is in proper operating
condition.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Important Safeguards

Notes

v
DAR Plus Operator’s Guide 400468-1 Rev. C
1 System Overview .............................................................................................1-1
1.1 Introduction ...........................................................................................................1-1
1.1.1 Modulator/Demodulator Options ...................................................................1-1
1.1.2 Operating Controls .........................................................................................1-1
1.2 DAR Plus Features ................................................................................................1-2
1.2.1 Options ...........................................................................................................1-2
1.2.2 Protection Options ..........................................................................................1-2
1.2.3 Digital or Analog Modulation ........................................................................1-2
1.3 Transmitter Overview ............................................................................................1-3
Figure 1-1 Transmitter Block Diagram .......................................................... 1-3
1.3.1 Transmitter Chassis Layout ............................................................................1-4
Figure 1-2 Transmitter Chassis Layout and Interconnection ......................... 1-4
1.3.2 Receiver ..........................................................................................................1-5
Figure 1-3 Receiver Block Diagram............................................................... 1-5
1.3.3 Receiver Chassis Layout ................................................................................1-6
Figure 1-4 Receiver Chassis Layout and Interconnection.............................. 1-6
1.4 Specifications ........................................................................................................1-7
1.4.1 General ...........................................................................................................1-7
1.4.2 Transmitter .....................................................................................................1-7
1.4.3 Receiver ..........................................................................................................1-7
1.4.4 Frequency Response .......................................................................................1-7
1.4.5 Analog Radio Performance ............................................................................1-7
1.4.6 Digital Specifications (Optional QM2 Modem) .............................................1-7
1.4.7 Electrical .........................................................................................................1-8
1.4.8 Environment ...................................................................................................1-8
1.4.9 Interconnection ...............................................................................................1-8
1.4.10 DIGITAL Specifications Summary ...............................................................1-9
1.4.11 Analog Specifications Summary ....................................................................1-9
2 System Installation ..........................................................................................2-1
2.1 Unpacking and Handling .......................................................................................2-1
2.1.1 Inspection .......................................................................................................2-1
2.1.2 Damage in Shipment ......................................................................................2-1
2.2 Installation Prerequisites .......................................................................................2-2
Figure 2-1 Rack Clearances – Top View........................................................ 2-2
2.2.1 Grounding the Equipment Rack .....................................................................2-3
2.3 Rack Installation ....................................................................................................2-4
Figure 2-2 Rack Installation ........................................................................... 2-4
2.4 Equipment Rack Installation .................................................................................2-4
Table 2-1 Equipment Rack Specifications .................................................... 2-4
Figure 2-3 Equipment Rack Template............................................................ 2-5
Figure 2-4 Equipment Rack – Front View ..................................................... 2-6
2.5 Initial Power-up Procedure ....................................................................................2-7
2.6 Power Requirements and Fuse Specifications .......................................................2-7
Table of Contents

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DAR Plus Operator’s Guide 400468-1 Rev. C
2.6.1 Fuse Specifications .........................................................................................2-7
Table 2-2 DAR PLus Fuse Specifications...................................................... 2-7
3 Operating Controls ..........................................................................................3-1
3.1 Overview ...............................................................................................................3-1
3.1.1 Common Keypad Functions ...........................................................................3-1
Figure 3-1 Keypad Functions ......................................................................... 3-1
3.2 Transmitter Menus .................................................................................................3-2
Figure 3-2 Transmitter Menu Diagram........................................................... 3-2
3.2.1 Transmitter Main Menu ..................................................................................3-3
Figure 3-3 Transmitter Main Menu................................................................ 3-3
3.2.2 Transmitter Power Supply Menu ...................................................................3-4
Figure 3-4 Tx Power Supply Menu ................................................................ 3-4
3.2.3 Transmitter Radio Menu ................................................................................3-5
Figure 3-5 Transmitter Radio Menu............................................................... 3-5
3.2.4 Transmitter Analog Menu ..............................................................................3-6
Figure 3-6 Transmitter Analog Mode Alarm States Menu............................. 3-6
3.2.5 Transmitter Digital Menu ...............................................................................3-7
Figure 3-7 Transmitter Digital Alarm State Status Menu .............................. 3-7
3.3 Receiver Menus .....................................................................................................3-8
Figure 3-8 Receiver Menu System ................................................................. 3-8
3.3.1 Receiver Main Menu ......................................................................................3-9
Figure 3-9 Receiver Main Menu..................................................................... 3-9
3.3.2 Receiver Power Supply Menu ......................................................................3-10
Figure 3-10 Receiver Power Supply Menu .................................................. 3-10
3.3.3 Receiver Radio Menu ...................................................................................3-11
Figure 3-11 Receiver Radio Menu ............................................................... 3-11
3.3.4 Receiver Analog Channel Menu ..................................................................3-12
Figure 3-12 Receiver Analog Channel Menu............................................... 3-12
3.3.5 Receiver Digital Menu .................................................................................3-13
Figure 3-13 Receiver Digital Alarm State Status Menu............................... 3-13
4 Summary Alarms .............................................................................................4-1
4.1 Overview ...............................................................................................................4-1
Figure 4-1 DAR Plus Diagnostic Interconnection.......................................... 4-1
4.2 Alarm Indicators ....................................................................................................4-2
Figure 4-2 Receiver Main Screen with Alarm Window................................. 4-2
4.2.1 LED Definitions .............................................................................................4-2
Figure 4-3 DAR Plus Front Panel Display and Keypad................................. 4-2
4.3 Transmitter Summary Alarms ...............................................................................4-3
4.3.1 Transmitter Power Supply Alarms .................................................................4-3
Table 4-1 Transmitter Power Supply Alarms................................................. 4-3
4.3.2 Transmitter Digital RF Shelf Alarms .............................................................4-3
Table 4-2 Transmitter Digital RF Shelf Alarms............................................. 4-3

vii
DAR Plus Operator’s Guide 400468-1 Rev. C
4.3.3 Transmitter Analog RF Shelf Alarms ............................................................4-4
Table 4-3 Transmitter Analog RF Shelf Alarms ............................................ 4-4
4.4 Receiver Alarms ....................................................................................................4-5
4.4.1 Receiver Power Supply Alarms .....................................................................4-5
Table 4-4 Rx General Power Supply Alarms................................................. 4-5
4.4.2 Receiver Digital RF Shelf Alarms .................................................................4-5
Table 4-5 Receiver Digital RF Shelf Alarms ................................................. 4-5
4.4.3 Receiver Analog RF Shelf Alarms .................................................................4-6
Table 4-6 Receiver Analog RF Shelf Alarms................................................. 4-6
4.5 Alarm & Connection Referencing .........................................................................4-6
4.5.1 DAR Plus Transmitter Alarm Reference .......................................................4-7
Table 4-7 DAR Plus Transmitter Alarm Reference Table ............................. 4-7
4.5.2 DAR Plus Receiver Alarm Reference ............................................................4-8
Table 4-8 DAR Plus Receiver Alarm Reference Table.................................. 4-8
A System Connections ......................................................................................A-1
Figure A-1 Rear Panel Connectors................................................................ A-1
Table A-1 Data I/O........................................................................................ A-2
Table A-2 Site Management - QM2 Internal Modem................................... A-2
Table A-3 Alarm I/O ..................................................................................... A-3
Table A-4 Summary Alarm........................................................................... A-4
Table A-5 Audio Channels............................................................................ A-4
B Modules .........................................................................................................B-1
B.1 DAR Plus Transmitter Modules ........................................................................... B-2
Figure B-1 Transmitter- Top View (Front Door Open)................................. B-2
B.2 DAR Plus Receiver Modules ................................................................................ B-3
Figure B-2 Receiver - Top View (Front Door Open).................................... B-3
B.3 Tx Audio Modulator Motherboard (900426) ....................................................... B-4
Table B-1 Tx Audio Modulator Motherboard Adjustments (900426) ......... B-4
Figure B-3 Tx Audio Modulator Adjustments (900426)............................... B-4
B.4 Audio Subcarrier Generator (900100) .................................................................. B-5
Table B-2 Audio Subcarrier Generator Adjustments (900100)..................... B-5
Figure B-4 Audio Subcarrier Generator Adjustments (900100) ................... B-5
B.5 Rx Video Demodulator (906556) ......................................................................... B-6
Table 1-3 Rx Video Demodulator Adjustments (906556) ............................ B-6
Figure 1-5 Rx Video Demodulator Adjustments (906556)........................... B-6
B.6 Rx Audio Motherboard (900414) ......................................................................... B-7
Table B-4 Rx Audio Motherboard Adjustments (900414)............................ B-7
Figure B-6 Rx Audio Motherboard Adjustments.......................................... B-7
B.7 Rx Audio Subcarrier Demodulator (900172) ....................................................... B-8
Table B-5 Rx Audio Subcarrier Demodulator (900172)............................... B-8
Figure B-7 Rx Audio Subcarrier Demodulator (900172).............................. B-8
B.8 Rx IF Filter/Equalizer (905560) ........................................................................... B-9

viii
DAR Plus Operator’s Guide 400468-1 Rev. C
Table B-6 Rx IF Filter/Equalizer Adjustments.............................................. B-9
Table B-7 Jumper Configurations ................................................................. B-9
Figure B-8 Rx IF Filter/Equalizer.................................................................. B-9
B.9 IF Amp (905764) ................................................................................................ B-10
Table B-8 IF Amp........................................................................................ B-10
Figure B-9 IF Amp (905764)....................................................................... B-10
B.10 IF Limiter/Amp (905720) ................................................................................... B-11
Table B-9 IF Limiter Adjustments .............................................................. B-11
Table B-10 IF Limiter Jumper Configurations............................................ B-11
Figure B-10 IF Limiter/Amp ....................................................................... B-11
C Frequency Settings ........................................................................................C-1
Figure C-1 Synthesizer Switch Locations ..................................................... C-1
Table C-1 .................................................6 GHz Oscillator Switch Settings C-2
Table C-2 ..........................................12/13 GHz Oscillator Switch Settings C-2

ix
DAR Plus Operator’s Guide 400468-1 Rev. C
Preface
Purpose
This manual explains how to install, operate, and configure the DAR Plus Radio. It also
provides troubleshooting information in order to remedy common system faults.
Audience
Thismanual is intendedfor qualified installersandservice technicianswhoneed toperform
the following tasks:
• Install the DAR Plus Radio in a standard equipment rack.
• Power up the unit and verify normal operation.
• Troubleshoot common system faults.
Terms and Conventions
For commonly used abbreviations and acronyms, see the Glossary on page x.
Related Documents
QM2 Modem Operator’s Guide – Instructions for installing and configuring the QM2
Modem
QM2 Intenal Modem - Component Drawing and Schematics
QM4 Modem Operator’s Guide – Instructions for installing and configuring the QM4
Modem
Variable Rate Modem Operator’s Guide – Instructions for installing and configuring the
Variable Rate Modem
Hot Standby Shelf Operator’s Guide — Instructions for installing and configuring the Hot
Standby Shelf.

Preface
x
DAR Plus Operator’s Guide 400468-1 Rev. C
Organization
This manual is divided into the following sections and appendices:
Section 1 System Overview - Description of the DAR Plus transmitter and receiver.
Section 2 System Installation - Describes how to install the DAR Plus and DAR Plus
in a standard equipment rack. Also included are power connections for both
AC and DC power configurations, as well as how to initially power up the
modem.
Section 3 Operating Controls - Describes the front panel LCD and keypad functions.
Section 4 Summary Alarms - Describes alarm conditions for the power supply as well
as analog and digital RF channels.
Appendix A System Connections - System Interconnections.
Appendix B Modules - Adjustments and Indicators for both plug-in and RF shelf
components.
Appendix C FrequencySettings -Synthesizerswitch settings for frequency bands 6,7, 12
and 13 GHz bands.
Glossary
This section describes commonly used acronyms and abbreviations used in
telecommunication and those specific to Microwave Radio Communications.
Term Definition
ØLK Phase Lock.
1RU 1 Rack Unit height.
A & C Alarm and Control.
ADPCM Adaptive Differential Pulse Code Modulation.
AFC Automatic Frequency Control.
AGC Automatic Gain Control.
AIS Alarm Indication Signal (all one’s).
AMI Alternate Mark Inversion, line code format for traffic data.
AVG Average.
B3ZS Bipolar 3 Zero Substitution, line code format for traffic data.
B8ZS Bipolar 8 Zero Substitution, line code format for traffic data.
BB Baseband.
BER Bit Error Rate.
BNC Bayonet lock coaxial connector.
BPF Band Pass Filter.
BPS Bits per second.
CCITT International Telegraph and Telephone Consultative Committee, a
telecommunications standardizing committee of the ITU.
Composite A band or grouping of frequencies and/or subcarriers, including video,
occupied by the signal in a radio transmission system. Same as
baseband signal.
dB Decibel.
dBm A unit of power measurement referenced to one milliwatt.

Preface
xi
DAR Plus Operator’s Guide 400468-1 Rev. C
DMUX,
DEMUX Demultiplexer
DS3 45 Mbps traffic rate
Duplex A channel capable of transmitting information simultaneously in either
direction.
E1 2.048 Mbps traffic rate.
E3 34 Mbps traffic rate
EIA Electronic Industries Association, an industry association that
establishes various standards.
EMC Electromagnetic compatibility.
EOW Engineering Order Wire.
ERRS Errors.
ESD Electrostatic discharge.
FCC Federal Communications Commission, the United State's
communications regulatory agency.
FEC Forward Error Correction rate.
FIFO First in, first out buffer.
FIR Finite Impulse Response.
FLR MRC's model designation for frequency modulated (FM) remodulating
radio systems from 2 to 15 GHz.FLR2 is the 2 GHz band version;
FLR4, the 4 GHz band version, etc.
FPGA Field Programmable Gate Array.
GND Ground.
H/W Hardware.
HDB3 High Density Bipolar 3 line code format for traffic data.
HPF High Pass Filter.
IIn phase
ID Identification.
IF Intermediate Frequency.
IRE 1. Institute of Radio Engineers, an international professional radio
engineering association that establishes various standards.
2. A unit of measurement, established by the IRE, in which 1 IRE Unit
=.00714 volts peak-to-peak (Vp-p) and 140 IRE units equals 1 Vp-p.
Kbps Kilobits per second.
KHz Kilo (1,000) cycles per second.
LCD Liquid Crystal Display
Lcl Local
LED Light emitting diode.
LO Local Oscillator
LOS Loss of Signal.
Term Definition

Preface
xii DAR Plus Operator’s Guide 400468-1 Rev. C
LPF Low Pass Filter.
Mbps Megabits per second.
MHz Million (1,000,000) cycles per second.
MUX Mutiplexer.
NRZ Near Return to Zero.
PER Parity Error Rate.
PLL Phase Lock Loop.
QQuadature phase.
QAM Quadature Amplitude Modulation
QPSK Quadrature Phase Shift Keying.
RCL/RSL Received Carrier Level.
Rcvr Receiver.
RF Radio Frequency, any frequency of electromagnetic radiation or
alternating currents in the range from 3 kHz to 300 GHz; as in RF
Signal or RF Transmission.
RF Level RF Power from the transmitter.
Rx Receiver.
S/W Software.
SC Service Channel.
Setpt Set point.
Simplex A channel capable of transmitting information in only one direction.
STDBY Standby.
Subcarrier An electromagnetic signal that is used as a medium for placing an
information channel above another information channel.
SYNTH Synthesizer
T1 1.544 Mbps traffic rate.
T3 45 Mbps traffic rate
Tx Transmitter.
VCO Voltage Controlled Oscillator.
VCXO Voltage Controlled Crystal Oscillator.
VDC Volts Direct Current.
VF Voice Frequency.
Video A term pertaining to the bandwidth and spectrum of the signal that
results from television scanning and which is used to reproduce a
picture.
Xmitr Transmitter.
Xmtr Transmitter.
Term Definition

1-1
DAR PLUS Operator’s Guide
1
Section
400468-1 Rev. C
1 System Overview
1.1 Introduction
The DAR Plus Radio is a versatile STL solution to satisfy a broad range of transport
solutions suitable for the following applications:
• Studio-to-transmitter links and transmitter-to-studio links
• Satellite backhauls
• Analog news gathering backhauls (ICR) Intercity Relay
• Cable headend feeds
• Multi-hop networks
• Support of channel plans from 10 to 28 MHz
• Architecture supports FCC and ITU channel plans from 1.9 to 15.4 GHz
The DAR Plus is designed to be readily convert to digital operation—with easy jumper and
dip switch changes in one transmitter module and two receiver modules.
The radio can be equipped for internal or external ATSC HDTV transport using MRC’s
QM2 modems. In addition, the DAR Plus used with the MRC Variable Rate Modem (MRC
VRM) provides several transport options for transmit and receive ends.
1.1.1 Modulator/Demodulator Options
Internal modem cards or external modem shelf for added flexibility in placement of digital
and RF circuits
• FMT/FMRAnalog 525 or 625 line video with four audio subcarriers
• QM2 19.39 MbpsATSC transport stream modem with additional DS1 (1.544
Mbps) data channel
• QM4 Modem - 44.736 Mbps DS3 (G.703 interface standard) channel
• COFDM modulator for paths with multipath issues
• PAL video and DVB-T transport stream support
• Variable Rate Modem for variable data rates and band width
1.1.2 Operating Controls
All transmitter and receiver functions are controlled using the front panel LCD and display.
For operating instructions, see Section 3, Operating Controls on page 3-1.

DAR Plus Features
System Overview
1-2 DAR PLUS Operator’s Guide 400468-1 Rev. C
1.2 DAR Plus Features
The DAR Plus features proprietary implementation of MRC Broadcast’s extremely stable,
low-noise YIG oscillator technology. It provide built-in diagnostics through front panel.
1.2.1 Options
• Analog: FMT/FMR 70 MHz, IF, 4 audio subcarriers, high-power output options
• Digital: Internal or external modem
• QM2, 19.39 mbps modulator/demodulator
• external QM4 modulator/demodulator
• AC or DC conversion
1.2.2 Protection Options
• Hot standby protection for transmit and receive ends
• Receive diversity
• Receive diversity “hitless” (QM2 internal only)
1.2.3 Digital or Analog Modulation
• Single carrier FM
• 16 QAM digital modulation

Transmitter Overview System Overview
1-3
1
DAR PLUS Operator’s Guide 400468-1 Rev. C
1.3 Transmitter Overview
Transmitter configurations can consist of either an internal or external digital 19.39 Mbps
modulator (QM2), an FM NTSC modulator, or an external modem or multiplexer such as
the MRC Variable Rate Modem or QM4 Modem. See Figure 1-1 for the transmitter block
diagram.
Figure 1-1 Transmitter Block Diagram
19.4 Mbps
MODEM
ATSC
(19.39 Mbps)
DS1
(1.544 Mbps)
SERVICE
CHAN.
(9.6 kbps)
ALARMS
(4 Alarms)
70 MHz
70 MHz
IRM
UPCONVERTER
FM
MODULATOR
NTSC
AUDIO
MODULATOR
AUDIO
(4 Chan.)
RF SECTION
DAR Plus Cabinet
External Modems
R
L
LIMITER
AMP
PLUG-IN
MODULES
70 MHz
DAR_Plus_Tx_BLK_1osc
Note 1 - Bit Rate and band width dependant.
Contact MRC for available applications.
LOCAL
OSCILLATOR X2
6 GHz
12 GHz
MULTIPLIER
AMP
QM2
VARIABLE
RATE
MODEM
(Note 1)
DS3, E3, DVB-T
DVB-ASI
RS-422,
LVDS Parallel
DVB-SPE
19.4 Mbps
MODEM
ATSC
(19.39 Mbps)
DS1
(1.544 Mbps)
SERVICE
CHAN.
(9.6 kbps)
ALARMS
(4 Alarms)
QM2
70 MHz
QM4
45 Mbps
DS3

Transmitter Overview
System Overview
1-4 DAR PLUS Operator’s Guide 400468-1 Rev. C
1.3.1 Transmitter Chassis Layout
Figure 1-2 on page 1-4 shows the chassis layout and interconnection for the transmitter.
Note that the RF modules, plug-in modules, and power supplies are located in the
approximate location within the chassis.
For a description of the rear panel connections, see Appendix A, System Connections.
Figure 1-2 Transmitter Chassis Layout and Interconnection
X2
MULTIPLIER
(D)
FM MODULATOR (A)
AUDIO MODULATOR (A)
UP
UPCONTER
LIMITER
IF AMP
POWER
AMP
TRAY
I F
TO ANTENNA External
Modulator
AC INPUT
CONTROL MODULE
QM2 ATSC MODEM (OPTIONAL)
FUTURE
DARPLUS_TX_CAB_BLK
FRONT PANEL
X2
MULTIPLIER
(12 GHz)
POWER
DISTRIBUTION
POWER AMP
POWER
SUPPLY
OSCILLATOR
6 GHz
LCD DISPLAY & KEYPAD
POWER SUPPLY
BACKPLANE
CABINET

Transmitter Overview System Overview
1-5
1
DAR PLUS Operator’s Guide 400468-1 Rev. C
1.3.2 Receiver
Receiver configurations can consist of either an internal or external digital 19.39 Mbps
demodulator (QM2), an FM NTSC demodulator, or an external demodulator or de-
multiplexer such as the MRC Variable Rate Modem or QM4 Demodulator.
See Figure 1-3 for the receiver block diagram.
Figure 1-3 Receiver Block Diagram
70 MHz
70 MHz
LNC
FM
Demod
NTSC NTSC Video
AUDIO
Demod AUDIO
(4 Chan.)
RF SECTION
DAR Plus Cabinet
RL
BPF
LIMITER
PLUG-IN
MODULES
70 MHz
(6 GHz)
QM2
Demod
VARIABLE
RATE
MODEM
(Note 1)
DS3, E3, DVB-T
DVB-ASI
RS-422,
LVDS Parallel
DVB-SPE
19.4 Mbps
ATSC
(19.39 Mbps)
DS1
(1.544 Mbps)
SERVICE
CHAN.
(9.6 kbps)
ALARMS
(4 Alarms)
QM2
Demod
70 MHz
QM4
Demod
45 Mbps
DS3
19.4 Mbps
QM2
Demod
ATSC
(19.39 Mbps)
DS1
(1.544 Mbps)
SERVICE
CHAN.
(9.6 kbps)
ALARMS
(4 Alarms)
IF
AMP
LOCAL
OSCILLATOR
X2
MULTIPLIER
Note 1 - Bit Rate and band width dependant.
Contact MRC for available applications.

Transmitter Overview
System Overview
1-6 DAR PLUS Operator’s Guide 400468-1 Rev. C
1.3.3 Receiver Chassis Layout
Figure 1-4 shows the chassis layout and interconnection for the receiver. Note that the RF
modules, plug-in modules, and power supplies are located in the approximate location
within the chassis.
For a description of the rear panel connections, see Appendix A, System Connections.
Figure 1-4 Receiver Chassis Layout and Interconnection
FM DEMODULA T OR (Analog)
AUDIO DEMODULATOR (Analog)
AC or DC INPUT
CONTROL MODULE
ATSC DEMODULATOR (OPTIONAL)
SPARE
RX_CAB_BLK
FRONT PANEL
LCD DISPLAY
& KEYPAD
POWER SUPPLY
BACKPLANE
CABINET
X2
MULTIPLIER
(12 MHz)
LNC
IF AMP
IF FILTER
LOCAL
OSCILLATOR
POWER
DISTRIBUTION
BOARD
IF
OUTPUT HDTV, DTV
HD (ATSC)
FROM
ANTENNA
RFTRAY
6 GHz

Specifications System Overview
1-7
1
DAR PLUS Operator’s Guide 400468-1 Rev. C
1.4 Specifications
1.4.1 General
Standard Frequency Bands:..........................................6.8 to 7.1 GHz, 12.7 to 13.2 GHz
Optional Frequency Bands:..................................................Contact MRC for information
on other bands from 1.99 to 15.4 GHz
Capacity, Analog: ......................................................525 or 625 line video, up to 4 audio
channels pilot carrier or video signal plus data above video
Capacity, Digital:........................................................................70 MHz modem interface
1.4.2 Transmitter
Type:......................................................................................................Single conversion
Local Oscillators: ........................................Ultra-low phase noise, phase-locked sources
Frequency Stability:...........................................................................................±0.0005%
Power Output:..................................................... See Operating SpecificationsSummary
1.4.3 Receiver
Type:......................................................................................................Single conversion
Local Oscillators: ........................................Ultra-low phase noise, phase-locked sources
Noise Figure: ....................................................................... See Specifications Summary
IF Bandwidth:.........................................................................................................30 MHz
Threshold:........................................................... See Operating Specifications Summary
VIDEO PERFORMANCE (optional FMT)
(Back-to-Back with CCIR Emphasis)
1.4.4 Frequency Response
10 kHz to 4.5 MHz (525 line):..............................................................................±0.25 dB
10 kHz to 5.0 MHz (625 line):..............................................................................±0.25 dB
5 MHz to 8 MHz (Baseband Output): ....................................................................±0.5 dB
Field Tilt:........................................................................................................... 3 IRE max
Line Tilt:......................................................................................................... 0.5 IRE max
Baseband Chroma Delay: ..............................................................................±20 nS max
Baseband Chroma Gain:................................................................................ ±2 IRE max
Differential Phase: .............................................................................................±0.5°max
Differential Gain:................................................................................................... 2% max
Signal-to-Noise Ratio:.................................................Meets or exceeds RS-250C; 67 dB
(See Analog Specifications Summary)
Signal-to-Hum (p-p/RMS):.................................................................................60 dB min
Video Input Level:....................................................................................................1 Vp-p
Video Input Return Loss:...................................................+26 dB min, reference to 75 Ω
1.4.5 Analog Radio Performance
Signal to Noise: ..........................................................Meets or exceeds RS-250C; 67 dB
Signal to Hum:...................................................................................................60 dB min
Signal to Discrete Tones: ..................................................................................65 dB min
Differential Gain:................................................................................................... 1% max
Differential Phase: ............................................................................................. ±0.2˚max
Note:One-hop, 525 or 625 line video per CCIR; -40 dBm receiver carrier level; excludes
modem.
1.4.6 Digital Specifications (Optional QM2 Modem)
Digital Video Channel
Data Rate: ..............................................................19.39 Mbps (ATSC transport stream)
Interface:..........................................................................................SMPTE 310M, typical

Specifications
System Overview
1-8 DAR PLUS Operator’s Guide 400468-1 Rev. C
Wayside Data Channel
Data Rate (DS1):.............................................................................................1.544Mbps
Interface:...................................................................................................................G.703
Asynchronous Service Channel
Data Rate: ............................................................................................................9.6 kbps
Interface:................................................................................................................RS-232
Modulation:...........................................................................................................16 QAM
FEC: .................................................Reed-Solomon (204/188) and depth 12 interleaving
1.4.7 Electrical
Power Consumption
Transmitter, unprotected terminal:............................................................75 Watts typical
Receiver, unprotected terminal:................................................................55 Watts typical
Power Supply Voltages: ................................................................................110/240 Vac
24/48 Vdc
1.4.8 Environment
Operating Temperature Range:.......................................................................0°to +50°C
Relative Humidity:.....................................................................0 to 95%, non condensing
Physical
Height:................................................................................ 3 rack units: 5.25" (13.34 cm)
Depth:........................................................................................................15.0" (38.1 cm)
Weight: .........................................................................................................22 lbs (10 kg)
1.4.9 Interconnection
RF Connections.................................................................................................................
1.71 to 4.90 GHz: ....................................................................Type “N”female connector
5.925 to 7.125 GHz: .................................................................................... TypeWR137;
CPR @ top of rack
7.10 to 8.50 GHz: ......................................................... Type WR112; CPR @ top of rack
10.70 to 13.25 GHz ........................................................................................ Type WR75
14.4 to 15.35 GHz: ......................................................................................... Type WR62
IF/Baseband Connectors:...........................................................................................BNC
Power, Audio & Alarm Connections: ....................................Barrier strip, screw terminals
Network Management Control:..............................................................9-pin D connector