Microwave Radio Communications CodeRunner 4 Manual

CodeRunner 4
Analog & Digital
Central Receiver
Operator’s Guide
Document: 400438-1
Revision JSeptember 2007
Section 2 - System Installation
Table of Contents
Section 1 - System Overview
Section 3 - Operating Controls
Appendix A - Receiver Interconnections
Section 4 - Troubleshooting
Section 5 - Remote Operation
Appendix B - Frequencies
Appendix C - Modules
Appendix D - Antenna Configurations
Section 6 - Media Switch

PROPRIETARY NOTICE
The information and design contained within this manual was originated by and is the property of
Microwave Radio Communications (MRC). 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.
©2007 Microwave Radio Communications
Printed in the U.S.A.
September 2007
Revision Date
A February 2000
B March 2000
C July 2000
D January 2001
E July 2001
F July 2002 ECO 2137
G October 2002 ECO 2195
H October 2002 ECO 2222
J September 2007
Microwave Radio Communications
101 Billerica Avenue – Bldg 6
North Billerica, MA 01862-1256
USA
TEL: [phone]
978.671.5700
FAX: [phone]

Safety Precautions
Safety Symbols
The following safety symbols are used in this manual:
Risk of Danger
Electrostatic Discharge.
Possible Damage to Equipment
.
Warnings, Cautions, and Notes
Use the following table to interpret how to distinguish between Warnings, Cautions, and Notes
Warning
Caution
Note
Gives information which, if strictly observed, will prevent personal injury or death, damage to personal
property, or the environment.
Gives information which, if strictly followed, will prevent damage to equipment or other goods.
Provides supplementary information.
General Warning
.
WARNING:
WARNING:
Risk of Electric Shock
CAUTION:
Nomenclature and Markings
Fuse - Identifies fuse boxes or their locations.
Frame or Chassis Ground - Identifies the frame ground
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 of a protective earth ground electrode.

Warning:
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.
Heed Warnings - 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
Communications. 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 Communications. 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 Service - 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 Communications.
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

v
CodeRunner 4 Operator’s Guide 400438-1 Rev. J
1 System Overview .............................................................................................................1-1
Figure 1-1 CodeRunner 4 Block Diagram....................................................................... 1-2
Figure 1-2 Front Panel ..................................................................................................... 1-3
Figure 1-3 Rear Panel Connections - Typical.................................................................. 1-3
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 .....................................................................................................2-6
3 Operating Controls ..........................................................................................................3-1
3.1 Common Key Functions .........................................................................................................3-1
3.2 Receiver Screens ....................................................................................................................3-1
Figure 3-1 Receiver Screens............................................................................................ 3-1
3.2.1 Main Screen .....................................................................................................................3-2
Figure 3-2 Main Screen ................................................................................................... 3-2
3.2.2 Menu Screen ....................................................................................................................3-3
Figure 3-3 Menu Screen ................................................................................................. 3-3
3.2.3 Remote Control Menu .....................................................................................................3-4
Figure 3-4 Remote Control Menu.................................................................................... 3-4
3.2.4 Configuration Screen .......................................................................................................3-5
Figure 3-5 Configuration Screen ..................................................................................... 3-5
3.2.5 Modify Channel Plan Screen ...........................................................................................3-5
Figure 3-6 Modify Channel Plan Screen ......................................................................... 3-5
3.2.6 RF Tray Screen ................................................................................................................3-6
Figure 3-7 RF Tray Screen .............................................................................................. 3-6
3.2.7 Power Supply Status Screen ............................................................................................3-7
Figure 3-8 Power Supply Status Screen .......................................................................... 3-7
3.2.8 Digital Demodulator Screen ............................................................................................3-8
Figure 3-9 Digital Demodulator Screen .......................................................................... 3-8
3.2.9 Video Demodulator Screen .............................................................................................3-9
Figure 3-10 Video Demodulator Screen.......................................................................... 3-9
3.2.10 Audio Screen .................................................................................................................3-10
Figure 3-11 Audio Screen.............................................................................................. 3-10
4 Troubleshooting ..............................................................................................................4-1
4.1 Front Panel Indicators .............................................................................................................4-1
Table of Contents

vi CodeRunner 4 Operator’s Guide 400438-1 Rev. J
Figure 4-1 Front Panel LEDs........................................................................................... 4-1
4.2 System Alarms ........................................................................................................................4-2
Figure 4-2 Main Screen .................................................................................................. 4-2
Table 4-1 System Alarms ................................................................................................ 4-2
4.3 Replacing the Fuse .................................................................................................................4-3
Figure 4-3 CodeRunner 4 Rear Panel - Typical ............................................................. 4-3
5 Remote Operation ...........................................................................................................5-1
5.1 Local and Remote Operation ..................................................................................................5-1
5.2 Command Inputs to the Remote Connector ...........................................................................5-2
Table 5-1 Remote Interface Connections ........................................................................ 5-2
5.2.1 Control Functions ............................................................................................................5-3
Table 5-2 RF Channel Selection...................................................................................... 5-3
Table 5-3 Offset Selection, – Active High ...................................................................... 5-3
Table 5-4 Band Select – Active High .............................................................................. 5-3
Table 5-5 IF Bandwidth Select – Active High ................................................................ 5-3
Table 5-6 Squelch Control – Active High ....................................................................... 5-4
Table 5-7 Digital Mode Select/Active High.................................................................... 5-4
Table 5-8 Digital Mode Select/Active High.................................................................... 5-4
5.2.2 Vdc Bias Supply ..............................................................................................................5-4
5.2.2.1 Ground .....................................................................................................................5-4
5.2.3 Status Outputs – Remote Connector J7 ...........................................................................5-4
5.2.3.1 Receiver Signal Strength Indication - Analog .........................................................5-4
5.2.3.2 Remote Mode Status ................................................................................................5-4
5.2.3.3 Squelch Alarm ..........................................................................................................5-4
6 Media Switch ....................................................................................................................6-1
6.1 Overview ................................................................................................................................6-1
Figure 6-1 Media Switch Block Diagram........................................................................ 6-1
6.2 Mounting the Media Switch ...................................................................................................6-2
Figure 6-2 Media Switch on CR4 Rear Panel ................................................................. 6-2
6.3 Media Switch Connections .....................................................................................................6-2
Figure 6-3 Media Switch Connections ............................................................................ 6-2
6.4 System Interconnection ..........................................................................................................6-3
Figure 6-4 System Interconnection.................................................................................. 6-3
6.5 Harness Assemblies ................................................................................................................6-4
Figure 6-5 Power & IF Control Harness (907008).......................................................... 6-4
Figure 6-6 Audio Harness (906978) ................................................................................ 6-4
A Receiver Interconnections ............................................................................................A-1
A.1 Cabinet Connections .............................................................................................................. A-1
Figure A-1 CodeRunner Rear Panel Connectors - Typical ............................................ A-1
A.2 Remote Interface Connector ..................................................................................................A-2
Table A-1 Remote Interface Connections (J7) ............................................................... A-2
Table A-2 Serial Port (J8)............................................................................................... A-3
Table A-3 Summary Alarm (J3) ..................................................................................... A-3
Table A-4 Rx Status (J13) .............................................................................................. A-3

vii
CodeRunner 4 Operator’s Guide 400438-1 Rev. J
Figure A-2 Receiver Interconnection Diagram - RF Shelf............................................. A-4
Figure A-3 Receiver Interconnection Diagram - Backplane .......................................... A-5
B Frequencies ....................................................................................................................B-1
B.1 Channel Frequencies ............................................................................................................. B-1
Table B-1 2 GHz Channel Guide (17 MHz Channel Plan) ............................................ B-1
Table B-2 2 GHz Channel Guide (12 MHz BAS Channel Plan) ................................... B-2
Table B-3 7 GHz Channel Guide.................................................................................... B-2
Table B-4 13 GHz Channel Selection Guide.................................................................. B-3
C Modules .........................................................................................................................C-1
Figure C-1 Receiver Components - Top View............................................................... C-1
C.1 Rx Video Demodulator .......................................................................................................... C-2
Figure C-2 Rx Video Demodulator Adjustments .......................................................... C-2
C.2 Audio SubCarrier Motherboard ............................................................................................. C-3
Figure C-3 Audio Subcarrier Motherboard ................................................................... C-3
D Antenna Configurations ................................................................................................D-1
D.1 Overview ............................................................................................................................... D-1
Figure D-1 Central Receive - Analog/Digital ................................................................ D-1
Figure D-2 Central Receive with Analog/Digital Media Switch.................................... D-2

viii CodeRunner 4 Operator’s Guide 400438-1 Rev. J
This page intentionally left blank.

ix
CodeRunner 4 Operator’s Guide 400438-1 Rev. J
Preface
Purpose
This manual explains how to install, operate, and configure the MRC CodeRunner 4 Central Receiver.
Audience
This manual is intended for qualified installers and service technicians who need to perform the
following tasks:
• Install the receiver in a standard rack mount.
• Power up and configure the system for either analog or digital system configurations.
• Troubleshoot common system problems.
For commonly used abbreviations and acronyms, see the Glossary on page x.
Related Documents
• MAC-1000 Master Antenna Controller
• ASC-140 Slave Antenna Controller
• MRC 2000 Antenna Controller
• ProScan Antenna
• MicroScan Antenna
• UltraScan Antenna
• SectorScan Antenna
• Ellipse CR Antenna
• Sector CR Antenna
• Omnipole Antenna
Customer Service
Customer Service Hours: Monday through Thursday
8 AM to 7 PM, Eastern Time (US)
Friday
8 AM to 5 PM, Eastern Time (US)
Telephone: [phone] (Press 3)
978-671-5700 (Press 3)
Fax: [phone]
Technical Support
Technical Support Service Hours: Monday through Friday
8 AM to 7 PM
Telephone: [phone] (Press 4)
978-671-5700 (Press 4)
Fax: [phone]
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.

Preface
xCodeRunner 4 Operator’s Guide 400438-1 Rev. J
When contacting Customer Service or Technical Support, please have the following
information available:
• Model number and serial number of the unit.
• Approximate purchase date.
• Unit identification markings and revision.
• Be prepared to accurately describe the problem.
Glossary
This section describes commonly used acronyms and abbreviations used in
telecommunications and those specific to MRC Broadcast Products Group.
Term Definition
ØLK Phase Lock
3RU 3 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
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 measurement referenced to one milliwatt.
DMUX,
DEMUX
Demultiplexer
Duplex A channel capable of transmitting information simultaneously in either
direction
E1 2.048 Mbps traffic rate
EIA Electronic Industries Association, an industry association that
establishes various standards.
EMC Electromagnetic compatibility

Preface
xi
CodeRunner 4 Operator’s Guide 400438-1 Rev. J
EOW Engineering Order Wire
ERRS Errors
ESD Electrostatic discharge
FCC Federal Communications Commission, the United State's
communications regulatory agency.
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
LPF Low Pass Filter
Mbps Megabits per second
MHz Million (1,000,000) cycles per second
MRC Microwave Radio Communications
MUX Multiplexer
NRZ Near Return to Zero
PER Parity Error Rate
PLL Phase Lock Loop
QQuadature phase
QPSK Quadrature Phase Shift Keying
Term Definition

Preface
xii CodeRunner 4 Operator’s Guide 400438-1 Rev. J
RCL Received Carrier Level
RSL Received Signal 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.
Site ID A physical location where any number of modems, transmitters, or
receivers are installed.
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
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
CodeRunner 4 Operator’s Guide
1
Section
400438-1 Rev. J
1 System Overview
This section provides an overview of the MRC CodeRunner 4 Central Receiver. For a
system block diagram of the receiver, see Figure 1-1 on page 1-2.
The CodeRunner 4 Central Receiver is capable of receiving in both analog or digital mode.
In the analog mode, the receiver outputs an NTSC signal with 4 audio channels, baseband,
and filtered video. In digital mode, the receiver outputs a digital data stream using either an
internal or external modem.
The incoming RF signal is down-converted to 70 MHz, filtered, and amplified. The output
from the IF Amplifier is split into two paths:
• A +5 dBm signal is routed to an analog demodulator, if one is installed.
• A second –10 dBm signal is routed to the power distribution board on the RF shelf.
Here the IF is switched to a direct rear panel connection. The switch is controlled
from the front panel display and keypad.
Power is brought to the receiver via a rear panel receptacle mounted on the plug-in power
supply. The power is routed through the rear panel backplane to the front panel display and
to the power distribution board on the RF tray,
All receiver functions are controlled from the front panel display and keypad. The receiver
can be controlled remotely and switched between analog or digital mode from either the
local or remote location.
The front panel displays common system faults with four LED indicators for power,
squelch, summary alarm, and remote/local status. Summary alarm messages appear as
scrolling text on the front panel LCD, A list of summary alarms and troubleshooting guide
can be found in Section 4, Troubleshooting on page 4-1.
For remote cabling and interconnections, see Appendix A, Receiver Interconnections.
For more information on the operating controls, see Section 3, Operating Controls on
page 3-1.
The receiver mounts in a standard 3RU rack unit. See Section 2, System Installation on
page 2-1.

System Overview
1-2 CodeRunner 4 Operator’s Guide 400438-1 Rev. J
Figure 1-1 CodeRunner 4 Block Diagram
REMOTE
I/0
LOW
NOISE
CONVERTER
IF
AMP
IF
FILTER
RF SHELF
REAR PANEL BACKPLANE
VIDEO DEMODULATOR
POWER SUPPLY
AUDIO DEMODULATOR
LCD
DISPLAY
&
KEYPAD
SYNTHESIZER
POWER
DISTRIBUTION
BOARD
PLUG-IN MODULES
RF
INPUT EXTERNAL
MODEM
AC
INPUT
AUDIO
OUTPUT
(4 Chan.)
VIDEO
BASEBAND
SUMMARY
ALARM
Rx STATUS
SERIAL
PORT
REMOTE
INTERFACE
PGM I/O
2ND
DOWN
CONVERTER
REAR PANEL
IF
OUTPUT
12 dB
COUPLER
815 MHz OUT

System Overview
1-3
CodeRunner 4 Operator’s Guide 400438-1 Rev. J
Figure 1-2 Front Panel
Figure 1-3 Rear Panel Connections - Typical
DIGCR_FR
MRC CodeRunner 4 POWER
REMOTE
SQUELCH
ALARM
VIDEO BB
SUM
ALARM
AUDIO
1
2
RXSTATUS
PGM I/O
REMOTE
INTERFACE
SERIAL
PORT
IF I/O
3
4
EXT MODEMDATA OUT
RF IN
~AC POWER
120/240; .4A
50/60 HZ
FUSE:
T1A 250VAC
"CAUTION
DOUBLE-FUSE
NEUTRAL/FUSING"
(J2)
(J12)
(J11)
(J15)
(J16)
(J3)
(J1)
(J13) (J7)
(J9) (J8)
815 MHz OUT

System Overview
1-4 CodeRunner 4 Operator’s Guide 400438-1 Rev. J
This page intentionally left blank.

2-1
CodeRunner 4 Operator’s Guide
2
Section
400438-1 Rev. J
2 System Installation
This section explains how to install the MRC CodeRunner 4, Digital Central Receiver. The
following topics are covered:
•Unpacking and Handling
•Installation Prerequisites
•Rack Installation
2.1 Unpacking and Handling
Each unit is shipped assembled, wired, and factory tested. Each unit is packaged in
appropriate shipping containers. Care should be taken when removing equipment from the
container to prevent damage to the unit. Check that all parts and accessories are removed
from the container and packing material before they are discarded. Verify that the
equipment items shipped agree with those listed on the sales order.
Note: DO NOT discard the container or any packing material until the
mechanical inspection has been satisfactorily completed. This
material must be available in the event that a damage claim needs to
be filed with the shipping carrier.
2.1.1 Inspection
Inspect the equipment for any shipping damage. Check that the equipment is clean and that
no cables or connectors are broken, damaged, or loose.
Note: At the time of inspection, DO NOT make any adjustments to internal
controls or adjustments. The equipment has been factory adjusted for
proper operation prior to shipment.
2.1.2 Damage in Shipment
Should any damage be discovered after unpacking the unit, use the following procedure:
1. Immediately file a claim with the shipping carrier.
2. Forward a copy of the damage report to MRC.
3. Contact Customer Service at which time they will determine the disposition of the
equipment.
For Customer Service information, see the Preface section of this manual.

Installation Prerequisites
System Installation
2-2 CodeRunner 4 Operator’s Guide 400438-1 Rev. J
2.2 Installation Prerequisites
Complying with installation prerequisites prevents problems from arising during
installation or future maintenance of the unit. Use the following guidelines:
1. Where possible, provide easy access to the front and rear of the equipment rack
(Figure 2-1).
- Allow a minimum of 18 inches [45.72 mm] clearance at the rear of the
equipment rack.
- To service and maintain the equipment, allow a minimum of 36 inches of
clearance in front of the equipment rack.
Caution: Reduced Air Flow – Installation of the equipment in a rack should
be such that the amount of air flow required for safe operation of
the equipment is not compromised.
Figure 2-1 Rack Clearances – Top View
REAR
CR4 Receiver
FRONT
18"
CLEARANCE
36"
CLEARANCE
MOUNTING
RAILS
[45.72 mm]
[89.9 mm]

Installation Prerequisites System Installation
2-3
CodeRunner 4 Operator’s Guide 400438-1 Rev. J
2. Avoid direct heat to the unit. If unavoidable, use deflector plates or install the unit in
a climate controlled environment.
Caution: Elevated operating ambient temperature – If installed in a closed
or multi-unit rack assembly, the operating ambient temperature of
the rack may be greater than the room ambient temperature.
Therefore, considerations should be given to the Template
Multiple Rack Assembly (TMRA).
3. Locate the equipment to allow for an adequate number of AC power outlets for test
equipment and power tools.
Caution: Circuit Overloading – Consideration should be given to the
connection of the equipment to the supply circuit and the effect
that overloading of circuits could have on over-current protection
and supply wiring. Appropriate consideration of equipment
nameplate ratings should be used when addressing this concern.
4. Check that the rack mounting rails are sufficiently rigid to support the rack and
equipment.
Warning: Mechanical Overloading – Mounting of equipment in a rack should
be such that a hazardous condition is not achieved due to uneven
loading.
5. Eliminate any conditions that could cause water to drip onto the equipment and
penetrate waveguide or cable openings.
2.2.1 Grounding the Equipment Rack
The equipment rack must be connected to the station ground using a #6 copper wire or
equivalent. The ground wire should be routed in as straight and direct a route as is practical.
Warning: Grounding the equipment rack is mandatory.

Rack Installation
System Installation
2-4 CodeRunner 4 Operator’s Guide 400438-1 Rev. J
2.3 Rack Installation
The MRC CodeRunner 4 mounts within a standard 19 inch equipment rack. The unit
occupies a 3 rack unit (3RU) height. The MRC CodeRunner 4 attaches to the equipment
rack using four 12–24 mounting screws. See Figure 2-2 for the correct mounting hole
locations.
Figure 2-2 Rack Installation
For detailed information on assembling and installing a standard equipment rack, see
Section 2.4, Equipment Rack Installation on page 2-4.
2.4 Equipment Rack Installation
Step 1 Remove the top and sides of the shipping container and packaging material, free
the rack from the pallet by removing the nuts and bolts securing it in place. Refer
to Table 2-1 for equipment rack specifications.
Table 2-1 Equipment Rack Specifications
Step 2 Remove the rack from its crate by lifting it off the mounting bolts and place it near
its final mounting location. After the rack has been raised to a vertical position,
remove the shipping support brackets the rack side rails.
Step 3 A template can be used for marking the floor location drilling holes for anchoring
the hardware (Figure 2-3). However, if the rack is available when these holes are
drilled, it is recommended that the rack base itself be used as a template.
Component Description
Finish Black baked enamel
Uprights Channel 3.0” (76.20 mm) deep x 1.4” (34.825 mm) wide x 0.25” (6.35
mm) thick.
Base Angles 4.0” (100.016 mm) high x 6.5” (162.40 mm) deep x 0.38” (9.50
mm) thick.
To p 1” (25.40 mm) high x 0.38” (9.50 mm) thick.
MOUNTING SCREWS
MRC CodeRunner 4