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NX25 Transmitter
Pre-installation Manual
Document:NHB-NX25-PRE
Issue: 3.2 2016-02-08
Status: Standard
Nautel Limited
10089 Peggy’s Cove Road
Hackett’s Cove, NS Canada B3Z 3J4
Phone: +1.902.823.3900 or
Toll Free: +1.877.6NAUTEL (6628835) (Canada & USA only)
Fax: +1.902.823.3183
Nautel Inc.
201 Target Industrial Circle
Bangor, Maine USA 04401
Phone: +1.207.947.8200
Fax: +1.207.947.3693
Customer Service (24 hour support)
+1.877.628.8353 (Canada & USA only)
+1.902.823.5100 (International)
Email: [email protected]
Web: www.nautel.com
The comparisons and other information provided in this document have been prepared in good faith based on publicly available information. The reader is encouraged to consult the respective manufacturer's most recent published data for verification.
© Copyright 2012 NAUTEL. All rights reserved.
Table of contents NX25 Pre-installation Manual
Contents
Release control record ix
About this manual xi
About Safety
Safety Precautions
xvii
Description 1-1
xv
Pre-installation tasks
Selecting a location for the transmitter
Installing an antenna feedline
Physical requirements 3-1
2-1
Page v
NX25 Pre-installation Manual Table of contents
Cooling requirements 4-1
Air flow in the transmitter 4-1
Electrical requirements
5-1
RF output requirements
Planning audio inputs
Planning control/monitor connections
AUI control (local and remote)
Parts and tools
8-1
9-1
6-1
7-1
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NX25 Pre-installation Manual Table of contents
Pre-installation assistance 10-1
Installation and commissioning service
List of terms 11-1
Issue 3.2 2016-02-08 Page vii
NX25 Pre-installation Manual Table of contents
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NX25 Pre-installation Manual
Release control record
Issue
3.0
3.1
3.2
Date
2012-11-01
2013-09-24
2016-02-08
Reason
Release of hardware (NARA59A).
Software release NX4.0.
Added Section 7: Planning Audio Inputs and Section
8: Planning Control/Monitor Connections
Section 1: Description: added SNMP and Phone
Home options to Remote Control and Monitoring section.
Section 5: Electrical Requirements: added NOTE below Table 5.1 to specify line current operating conditions and inrush current rating.
Section 7, Planning Audio Inputs: added stereo broadcast NOTE to “AES/EBU” paragraph; added
DRM Simulcast paragraph to “Other Considerations” sub-section.
Section 8: Planning Control/Monitor Connections: added more detail to Web Based Control section, including SNMP, Nautel Phone Home, etc.
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NX25 Pre-installation Manual
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NX25 Pre-installation Manual
About this manual
This manual provides information about preparing for the delivery and installation of an NX25 transmitter. This manual is intended for use by field technicians, site managers, and installation planners.
Using this manual
Read the task list provided in Section 2, “Pre-installation tasks” on page 2-1 . The task list describes the preparations you must make prior to receiving and installing the NX25 transmitter.
Later sections of the manual provide reference information regarding physical, cooling, electrical, and antenna requirements.
Technical support
Nautel offers technical support to customers over the Internet and by telephone. Nautel’s customer support team will answer your questions and work with you to identify and resolve problems.
For 24-hour technical support, call toll free at 1.877.628.8353 (in USA and Canada only) or call
1.902.823.5100 (international) or find us on the Internet at http://www.nautel.com
.
For parts and tools information, see “Parts and tools” on page 9-1 of the
NX25 Pre-Installation
Manual .
For extended warranty information, see “Pre-installation assistance” on page 10-1 of the
NX25 Pre-Installation Manual .
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NX25 Pre-installation Manual
NX25 transmitter manuals
The NX25 documentation suite includes the following documents:
NX25 Pre-installation Manual, NX25-PREINST.
Provides instructions and reference information needed when planning and preparing for the installation of an NX25 transmitter.
Nautel Site Protection Manual.
Provides detailed information about protecting your site from lightning-related hazards.
NX25 Installation Manual, NX25-INST.
Provides instructions and reference information needed when installing an NX25 transmitter.
NX25 Operating and Maintenance Manual, NX25-OPS-MAINT.
Provides instructions for operating, maintaining and troubleshooting an NX25 transmitter. It also provides reference information needed when performing diagnostic procedures.
NX25 Troubleshooting Manual, NX25-TROUBLE.
Provides detailed technical information about the NX25 transmitter, including electrical schematics and mechanical drawings.
Nautel website / Online resources
The Nautel website provides useful resources to keep you up to date on your NX25.
Nautel User Group (NUG)
The website includes a special section that customers can log into in order to access the Nautel customer newsletter, product manuals, frequently asked questions (FAQ), information sheets, quick guides and information about field upgrades.
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NX25 Pre-installation Manual
Figure 3.1: Accessing the NUG www.nautel.com
TOP BANNER OF NAUTEL’S HOME
NUG SIGN-IN
Documentation: online and printed
The website’s NUG section provides online access to all the documentation for your NX25.
Documentation is provided in Acrobat (PDF) format. You can use the documentation online or print the sections that you need.
When using online documents:
• Click on the blue hyperlinks to jump to a related section, or to get additional information
(e.g., view a term’s definition).
• To search a document to find keywords, use Find in Acrobat Reader’s Edit menu.
• To quickly find a specific section, click the section in the PDF file’s Bookmarks list.
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NX25 Pre-installation Manual
When using printed documents:
• To find keywords, go to the Index section at the end of the manual.
• To find a specific term, go to the List of Terms section near the end of the manual.
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About Safety
All Nautel transmitters are designed to meet the requirements of EN60215, Safety Requirements for
Radio Transmitters. The philosophy of EN60215 is that the removal of any cover or panel that can only be opened using a tool is a maintenance activity, and that any person performing a maintenance activity is expected to be trained for that activity. Under EN60215, it is assumed that trained personnel will be knowledgeable and will take precautions such as removing all power to the transmitter before accessing its components.
Electrical Hazards
To remove power from the transmitter, switch off and lock out the ac power. There are three amber
LEDs at the bottom rear of the cabinet that glow to remind anyone who has not turned off the power that the system is live and serious danger is present.
DANGER - HIGH VOLTAGE
Indicates dangerous voltage (in excess of 72 volts), capable of causing a fatal electrical shock, are present on or near parts bearing this label.
WARNING: It is not enough to switch off RF power. The power line is still connected. Disconnect and lock out the upstream supply before servicing.
Mount the transmitter ac power disconnect switch/breaker close to the transmitter so that it can be reached quickly in an emergency. Clearly label the switch/breaker (e.g., EMERGENCY SWITCH ).
After turning off the power, always perform a measurement to confirm that the power is off before touching anything within the transmitter. If the wrong breaker was opened, the equipment will be live.
WARNING: Do not use an ordinary multimeter to check for voltage, since it may have been left inadvertently on the AMP (A) range, triggering a short and an arc blast that could result in severe burns and even death.
Use only a non-contact voltage probe or a safety voltmeter (available from vendors such as Fluke,
Ideal, and Teagam).
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NX25 Pre-installation Manual
Use a proper lockout procedure to ensure that another worker cannot accidentally reapply power while you are performing maintenance on any part of the transmitter or site.
Lightning Hazards
Before opening the transmitter and touching internal parts, remove and solidly ground the antenna connection.
WARNING: It is not enough to ground the antenna terminal with the antenna still connected. Even a small impedance in the ground strap will result in lethal voltages during a lightning strike.
RF Hazards
A serious RF hazard and very high voltages exist in the vicinity of the antenna and its networks during normal operations.
Toxic Hazards
There are devices used in this equipment containing beryllium oxide ceramic, which is non-hazardous during normal device operation and under normal device failure conditions. These devices are specifically identified with “(BeO)” in the Description column of the Troubleshooting Manual’s parts list(s).
Do not cut, crush or grind devices because the resulting dust may be hazardous if inhaled.
Unserviceable devices should be disposed of as harmful waste.
Other Hazards
Ensure that appropriate fire alarms and fire extinguishers are available. Extinguishers must be suitable for use on electrical fires.
Many other site safety risks exist. It is beyond the scope of this manual to identify all the risks and procedures.
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Safety Precautions
This section provides very important information about protecting the safety of personnel and equipment:
•
Personal Safety - see page xvii
•
•
Equipment Safety - see page xx
Personal Safety
Training
The training of any personnel who will have physical access to the site or the transmitter is very important. Personnel must be familiar with the transmitter, so that they can avoid physical danger, and be aware of hazards to themselves and the equipment.
Nautel offers a number of training courses covering the basic fundamentals of RF systems and transmitters, and the operation and maintenance of the transmitter. For more information about available courses and schedules, go to the Nautel website at http://www.nautel.com/Training.aspx
, or ask your Nautel sales representative.
Site Orientation
When you give personnel access to the transmitter site (e.g., hiring new personnel, or giving access keys to personnel), perform a site orientation to ensure that they are familiar with the site, on-site procedures, and on-site hazards. Cover the following topics:
• Securing the site (locking doors and fences) to prevent unauthorized access
• How and when to call for technical support or emergency assistance
• Areas of the site and pieces of equipment that are off limits
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NX25 Pre-installation Manual
Voltage Awareness
Ensure that all personnel that are able to access areas with high voltage circuits or high field strengths are aware of the hazards associated with high voltage. Cover the following topics:
• High voltage or high field strength areas where caution is required
• Physical risks of electric shock
• Risks for personnel with pacemakers or other medical implants
• Induced voltages in high field strength areas
• On-site risks during thunderstorms and lightning strikes
• Operation of safety interlocks (if installed)
First Aid
Nautel does not offer first aid training, since the hazards associated with high voltage and RF energy are not specific to the transmitter. However, the customer should provide first aid training to all personnel who have access to the transmitter site. First aid training should include CPR, care of burns, artificial respiration, and defibrillation if specific equipment is available on-site.
Site Safety
Controlling Access
Transmitters and antennas generate and carry dangerous voltages that can be harmful or fatal. It is very important that you control access to the site and its equipment. To secure your transmitter site, use:
• Locking steel or security doors to prevent casual access
• A perimeter fence to keep trespassers away from the antenna system and feedline
• “No Trespassing” signs
• An alarm system
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Marking Hazards
Place warning signs close to any hazardous areas or systems (e.g., the feedline or the antenna system).
Make the signs large enough that they cannot be missed. Provide signage in all languages used in the region. These signs are intended not only for authorized personnel, but also for emergency responders or accidental trespassers.
Qualifying Site Personnel
Make sure that personnel who have access to the site are qualified to work around electronics and high voltage systems.
Ac Power Protection
You should take steps to protect equipment from surges (over-voltage spikes) on the ac power lines.
Surges may occur during thunderstorms, or because of malfunctions in the electrical distribution grid.
Surge suppressors and ac power conditioners can prevent serious damage to your on-site equipment, including the transmitter.
RF Protection
Transmitters and their antenna systems create intense radio frequency fields at the transmitter site, particularly near the feedline, antenna and tower. At some sites, these fields may cause biological effects, including the heating of body tissues. Intense fields can also create dangerous high voltages on ungrounded, conductive surfaces and objects. At certain points where high voltage conductors come close to grounded conductors (e.g., at feedline junctions or on the tower), dangerous electrical arcing or overs can occur. It is very important that you take the following steps to prevent damage to equipment or personnel due to RF fields:
• Use safety interlocks to de-energize transmitters if personnel open doors or panels accessing high field areas
• Place warning signs in any locations where high fields can occur
• Train personnel about the short-term and long-term hazards of RF radiation
• Use personal RF monitors to alert personnel when hazardous RF radiation levels are present
• Physically block access to the area around the antenna system, feedline and tower
• Ground all exposed conductive surfaces or objects in high field areas
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NX25 Pre-installation Manual
The RF connection to the transmitter output can be a serious safety hazard. Connect a 50 test load during installation and commissioning. It is recommended that a switch be used to automatically connect the transmitter to the antenna system without human contact with the transmitting conductors.
Safety Interlocks
The transmitter contains an electrical interlock, which is an external circuit that turns off the RF output if any of its switches are opened.
Ac Disconnect Switch
Safe operation of the transmitter requires an ac disconnect switch. Lock the ac disconnect switch in the disconnected (open) position during the installation process.
Equipment Safety
Electrostatic Protection
The transmitter’s systems are very rugged and resistant to damage. However, it is possible for damage to occur because of high voltage electrostatic discharges during servicing. Train all service personnel to ground themselves to bleed off any static charge before opening the transmitter or touching any exposed components. Provide a grounding wand or known ground (e.g., a grounded metal table) that personnel can use to discharge themselves.
Surge Protection
Surge protection is recommended for your entire site. However, even if you do not use a surge protector on the service entrance to the site, you should install a surge protector in the transmitter’s ac power feed to prevent over-voltage from entering the transmitter.
Lightning Protection
The transmitter is designed to resist lightning strike damage. However, intense or repeated strikes could damage the transmitter. We recommend that you install lightning suppression on the antenna, tower and feedline to reduce the effect of lightning strikes on the transmitter itself (and to protect the rest of your site equipment and your personnel). For detailed information about lightning protection, see the Nautel Site Preparation Manual, available from your Nautel sales agent, or online from the
Nautel website.
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Physical Protection
Consider physical hazards to equipment at your site, including the transmitter. Ensure that equipment is protected from weather (e.g., rain or flooding), even during extreme weather events. Place equipment so that it is not in the path of swinging doors or high-traffic areas. Do not allow wheeled items like office chairs or tables with wheels in the transmitter room, as these may damage equipment if accidentally pushed or knocked over. Do not place the transmitter under water pipes, drains, or sprinklers. Keep any equipment that generates heat, like the transmitter, away from flammable materials like ceiling panels, cubicle dividers, and curtains.
Earthquake Protection
If the transmitter site is in a region that experiences any noticeable earthquake activity, take steps to prevent the transmitter from shifting or rocking during an earthquake. Even during minor earthquakes, rocking or movement of the transmitter is likely to damage the feedline connection, and could even cause a catastrophic failure of the ac power feed into the transmitter. During larger earthquakes, the weight of the transmitter chassis could be hazardous to nearby equipment or personnel.
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NX25 Pre-installation Manual Description
Section 1: Description
This section provides a basic description of the NX25 transmitter and includes the following topics:
•
•
Capabilities
Power
The NX25 is capable (with 120% positive peak modulation) of up to 27.5 kW of RF carrier power.
The maximum continuous average power (carrier plus modulation) is 37.5 kW (corresponding to 25 of carrier power with 100% continuous tone modulation; the NX25 is capable of operating indefinitely at this power level.
The operator can vary the power continuously or switch to preset power levels using the NX25 graphic user interface (AUI). The power output can also be scheduled to correspond with authorized daytime power levels.
Modulation
The NX25 is capable of double sideband (AM) modulation. With the addition of an optional internal signal generator, IBOC modulation can be provided to the exciter. DRM modulation can be provided to the exciter with an external modulator that produces I/Q over AES.
Antenna tolerance
The NX25 will operate at rated power with a VSWR of up to 1.5:1. A higher VSWR results in a protective reduction of output power. The greater the VSWR, the greater the reduction in RF power.
(To maintain the quality of digital broadcasts, lower VSWR levels are required. Consult with Nautel.)
The NX25 will not fail or completely shut down, regardless of antenna or feedline failure.
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NX25 Pre-installation Manual Description
Remote control and monitoring
The NX25 has several remote control and monitoring options that allow you to monitor critical parameters of transmitter operation and control common functions, such as power output and exciter selection.
• AUI - logging into the remote AUI (advanced user interface) via a LAN connection to the transmitter.
• SNMP - configurable through the remote AUI; allows configuration of agents and traps.
• Discrete Wiring - routing multiconductor signaling cable from the transmitter to a remote control board.
• Nautel Phone Home - configurable through the remote AUI; monitors transmitter data and allows Nautel’s Customer Service Department to proactively support your transmitter, possibly before a fault occurs.
Redundancy
The NX25 features redundancy in all key systems:
• RF power modules
• Power supplies
• Exciters
• Cooling fans
• Low voltage power supplies
Ac power
The NX25 variable power transformer can be set to use a range of input voltages and power frequencies, as described in Section 5, “Electrical requirements” on page 5-1 of this manual.
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NX25 Pre-installation Manual Description
Options
IBOC
The NX25 supports IBOC digital radio as a modulation option. The external IBOC signal source provides a signal to the NX25 exciter.
DRM
The NX25 supports Digital Radio Mondiale (DRM) radio as a modulation option. The external
DRM signal source provides a modulating signal to the NX25 exciter via I/Q over AES.
Open/closed air cooling
There are two cooling configurations available for the transmitter. See Section 4, “Cooling requirements” on page 4-1 for more information.
GPS Sync Card
A GPS sync PWB can be purchased that is capable of driving a 3.3 V or 5 V GPS antenna. If the optional GPS sync PWB is installed, it provides the necessary 10 MHz, 1 PPS and 1 kHz sync signals used by the exciter(s). The exciter uses these signals to synchronize the transmitter’s carrier frequency and phase to this GPS reference.
USB sound card
The NX25 supports using audio files stored on a USB flash drive as a backup audio source. The USB sound card is necessary for connecting the audio output of the single-board computer (SBC) to the exciter’s audio input .
Spares
A kit of spare parts is available that contains fuses, ferrite toroids, semiconductors, low voltage power supplies, cooling fan, air filter and other items. Additional spare parts and assemblies may be purchased individually including RF power modules, fan tray assemblies and PWB assemblies.
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NX25 Pre-installation Manual Description
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NX25 Pre-installation Manual Pre-installation tasks
Section 2: Pre-installation tasks
This section provides a list of tasks that you must perform prior to delivery and installation of the
NX25 transmitter.
WARNING: FAILURE TO COMPLY WITH RECOMMENDATIONS MAY VOID
YOUR MANUFACTURER’S WARRANTY. FOR MORE INFORMATION, REVIEW
YOUR WARRANTY DOCUMENTS.
Preparing for installation
To prepare for installation of an NX25 transmitter, perform the following tasks:
1. Ensure that the correct transmitter configuration is ordered. Check the ac power requirements, preset frequency and other options.
2. Select a location for the transmitter in the transmitter room. Determine whether additional heating, ventilating or cooling capacity is needed at the site. Identify any special requirements regarding air flow around the cabinet (for example, ducting hot air away from the cabinet, or bringing in external cooling air). See
“Selecting a location for the transmitter” on page 2-3
.
3. If this is an upgrade or replacement transmitter (that is, if the site is already set up for a
. (If you are upgrading a site, verify the feedline, the lightning protection systems, and the ac power service. Refer to Nautel’s Recommendations for Transmitter
Site Preparation Manual.
)
4. Install ac power service into the planned location of the transmitter, and select a location for the ac power entrance near the transmitter location. For detailed information, see
“Electrical power” on page 5-1
.
Be aware of lightning protection issues when installing ac power. Lightning protection is essential to protect both personnel and equipment at your site. Refer to Nautel’s
Recommendations for Transmitter Site Preparation Manual.
5. Install a safety power interlock switch in series with the ac power service installed in
.
Nautel provides an optional keyed interlock system that will meet this requirement. See the
NX25 Operations and Maintenance Manual for details on using the optional keyed interlock system.
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NX25 Pre-installation Manual Pre-installation tasks
6. Install lightning protection on the antenna tower. Refer to Nautel’s Recommendations for
Transmitter Site Preparation Manual..
7. Place a work area with a clear table surface near the transmitter location. Provide electrostatic protection measures in the work area.
8. Order any accessories or optional equipment that you may need.
9. Terminate the transmitter end of the RF feedline with the appropriate mating connector.
Unless otherwise specified in contract documents, the transmitter will accept a 3-1/8 inch
EIA flange connector.
10. If the transmitter will be used to broadcast IBOC, perform a full impedance sweep of the antenna system. See
“Antenna system” on page 6-3 .
11. Arrange manpower or lifting equipment to move and assemble the transmitter. You may want to use a forklift to move either the transmitter or its power transformer into place for installation.
12. If you are going to use an external frequency reference, ensure that the reference source meets required specifications.
13. Prepare to integrate the NX25 transmitter into your station control circuitry, if required.
14. Train your station technicians and operators on the use and maintenance of the NX25 transmitter.
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NX25 Pre-installation Manual Pre-installation tasks
Selecting a location for the transmitter
To ensure that the desired location for the NX25 transmitter is suitable, perform the following tasks:
1. Ensure that the floor area where the transmitter will be located is able to support the weight of the transmitter system.
2. Measure the space to ensure that the transmitter will fit. See
Section 3, “Physical requirements” for transmitter dimensions and clearances.
3. Ensure that transmitter room doors and the pathway of access from the receiving dock or building exterior to the installation location are large enough to accommodate the transmitter.
Installing an antenna feedline
When installing an antenna feedline for the NX25 transmitter, perform the following tasks:
1. Ensure that the RF feedline that will connect the transmitter and the antenna system has a suitably rated coaxial cable.
2. Connect the shield of the antenna feedline coaxial cable directly to the station reference ground where it enters the building. For more information about the station reference ground, see
“Station reference ground” on page 5-4
.
3. Install lightning protection devices. For more information about lightning protection, refer to Nautel’s Recommendations for Transmitter Site Preparation Manual.
4. Pass the center conductor and the shield of the feedline cable through a ferrite toroid that is positioned between the shield ground at the building entrance and the shield termination at the transmitter. Install the ferrite toroid prior to installing flanges on the feedline cable.
• To obtain the proper size ferrite toroid, contact Nautel support for recommendations
(see
), or consult additional, outside suppliers.
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NX25 Pre-installation Manual Physical requirements
Section 3: Physical requirements
This section provides physical specifications for the NX25 transmitter and its components, and lists physical site requirements. This section includes the following topics:
•
•
•
Dimensions
The NX25 transmitter excluding ac power entrance has the following dimensions:
• Height: 184.0 cm (72.4 in)
• Width: 95.7 cm (37.7 in)
• Depth: 118.1 cm (46.5 in)
Figure 3.1: NX25 transmitter
Issue 3.2 2016-02-08 Page 3-1
NX25 Pre-installation Manual Physical requirements
Clearances
For the transmitter cabinet, the required minimum clearances are 1.2 m (4.0 feet) at the front and rear to allow for the swing of the front and rear doors and 0.9 m (3.0 feet) at one side (either left or right) to allow for possible combiner maintenance.
Check the clearance to ensure that you will be able to open all doors and access panels. The front control panel is hinged on the left (when looking at the front of the transmitter).
Also consider access to the rear of the transmitter during installation and servicing, and access to the front of the transmitter during power module replacement. You must allow space to open the front panel and slide out any of the power modules. These modules slide straight in and out of the shelf unit in the front of the transmitter.
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NX25 Pre-installation Manual
Figure 3.2: NX25 top view
Physical requirements
Ac Power
Cable Entry
Exhaust Duct
(see dimensions below)
RF Output
Control/Monitor
Cable Entry
FRONT
Dimensions in inches (mm)
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EXHAUST DUCT DIMENSIONS
Page 3-3
NX25 Pre-installation Manual
Figure 3.3: NX25 top view (with door swing)
Physical requirements
Front
Exhaust
Dimensions in inches (mm)
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NX25 Pre-installation Manual
Figure 3.4: NX25 front view
Physical requirements
Issue 3.2 2016-02-08
Dimensions in inches (mm)
Page 3-5
NX25 Pre-installation Manual
Figure 3.5: NX25 rear view
Side
Physical requirements
Rear
Dimensions in inches (mm)
Figure 3.6:
Page 3-6
Station Reference
Ground Stud
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NX25 Pre-installation Manual Physical requirements
Weight
for the various weights of transmitter components, including crated and uncrated
weights.
Table 3.1: Weight of components
Crate contents Uncrated weight
567 kg (1250 lbs)
Crated weight
687 kg (1515 lbs) Transmitter cabinet (with modules)
Power transformer
Ac power disconnect switch
300 kg (661 lbs)
TBD kg (TBD lbs)
TBD kg (TBD lbs)
TBD kg (TBD lbs)
Note: Power transformer cabinet and ac power disconnect switch weights are based on the standard
380 V transformer primary voltage. Weight may vary based on the primary voltage; contact Nautel for custom primary voltage options.
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NX25 Pre-installation Manual Physical requirements
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NX25 Pre-installation Manual Cooling requirements
Section 4: Cooling requirements
This section provides information about heating and cooling requirements for the NX25 transmitter site. Topics in this section include:
•
•
•
Air flow in the transmitter
There are two configurations for drawing cooling air through the NX25 - open air cooling and closed air cooling. The NX25 has redundant cooling fans to ensure effective cooling.
Open air configuration
In an open air configuration (see Figure 4.1
), cooling air is drawn through air filters in the back of the transmitter. Air circulates down into the base of the transmitter, and is then pushed up through the front rack of the transmitter by a set of fans. Warm air exits the transmitter through the grill at the top of the transmitter. Exhaust air may or may not be ducted away from the transmitter. Cool air for the intake cannot be ducted to the transmitter as this blocks access to the rear of the transmitter.
Figure 4.1: Air flow in the NX25 transmitter (open air cooling shown)
Exhaust air
Front of
NX25
Fans
Back of
NX25
Incoming air
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NX25 Pre-installation Manual Cooling requirements
Closed air configuration
In a closed air configuration (see Figure 4.2
), cool air is drawn in through a grill or duct at the top of the transmitter, near the back. The air circulates inside the transmitter and exhausts in the same manner as the open air cooling option. In this configuration, ccoling air must be ducted to the intake grill and the exhaust air must be ducted away from the transmitter.
Closed air cooling requires an optional panel to cover the filter cut-out in the rear door. This panel is available from Nautel.
Figure 4.2: Air flow in the NX25 transmitter (closed air cooling shown)
Exhaust air Incoming air
Front of
NX25
Fans
Back of
NX25
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NX25 Pre-installation Manual Cooling requirements
Cooling
Do not allow the transmitter room ambient air temperature to exceed 50°C (122°F) at sea level.
Cooler temperatures are recommended in order to improve the reliability of the transmitter. At higher altitudes, derate the maximum inlet air temperature as follows:
• De-rate the ambient temperature 3ºC (5.4°F) per 500 m – or 2ºC (3.6°F) per 1,000 feet – above sea level.
Example: At 1600 m (1 mile) above sea level, maximum ambient temperature should not exceed 40.4ºC (104.7°F).
Note: Ensure hot air from the transmitter is not drawn back into the transmitter’s cool air intake.
Cooling plant requirements
Where n
XMTR
is the transmitter’s efficiency and P out
is the transmitter’s average output power.
Calculate the power dissipated by the power transformer using the following equation:
Where n
XFMR is the transformer’s efficiency. For continuous tone modulation, calculate the average output power of the transmitter using the following equation:
Where m is the modulation depth and P c
is the transmitter’s output carrier power.
Table 4.1 on page 4 shows the cooling requirements for the transmitter when operating with various continuous tone modulation levels. To determine the number of British thermal units (Btu) being generated per hour as waste heat, multiply the waste heat (in watts) by 3.413. To determine the air conditioning (in tonnes), multiply the waste heat (in watts) by 0.000285.
Issue 3.2 2016-02-08 Page 4-3
NX25 Pre-installation Manual Cooling requirements
Table 4.1: Cooling requirements for the NX25
Carrier power out
(W)
25,000
Modulation depth
(m x100)
100%
Average power out
(W)
37,500
Waste heat
3250
(W)
25,000
25,000
75%
50%
32,030
28,125
2780
2500
Waste heat
(BTU/hour)
11,090
9490
8530
3.2
Air conditioning required in a closed system (tonnes)
2.7
2.4
Note: Although normal program audio is generally equivalent to 50-75% continuous tone modulation, Nautel recommends you design the cooling system for 100% continuous tone modulation, to allow suffiicient overhead and for testing purposes.
Closed loop or forced air cooling systems
Closed loop or forced air cooling systems can be used, so long as the air is well filtered to prevent dust and insects from entering the transmitter, and so long as a minimum of 1,500 cubic feet per minute (CFM) at 0.5 pounds per square inch (PSI) is supplied to the intake duct.
Heating
The transmitter room must contain a heating system that will ensure the ambient air temperature does not drop below 0°C (32°F).
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NX25 Pre-installation Manual Electrical requirements
Section 5: Electrical requirements
This section describes electrical power and electrical protection requirements associated with the
NX25 transmitter. This section includes the following topics:
•
•
Station reference ground - see page 5-4
CAUTION: Technical pre-commissioning activities described in this section require technical decisions and the customization of electrical circuits. Do not attempt to perform these activities unless you are a certified electrician.
Refer to Nautel’s Recommendations for Transmitter Site Preparation Manual for information about requirements associated with lightning protection.
Electrical power
The transmitter is preconfigured to operate from a 50/60 Hz 3-phase, 3-wire plus ground, Wye or closed delta ac power source. You select the specific voltage range when you order the transmitter.
Voltage stability
The ac power source nominal voltage must be stable to within plus or minus 15% under all loading conditions. The transmitter contains circuitry that maintains the RF output at the preset carrier level for voltage variations within the specified range, provided the correct transformer tap is chosen.
Power consumption
When operating at 25 kW with 100% modulation by a continuous sine wave, power consumption is approximately 42 kW (43 kVA). When operating at 25 kW with no modulation, power consumption is 28 kW. Power consumption for a specific station will depend on the programming format and the level of audio processing. Nautel recommends the ac power source have a 25% over-capacity to ensure adequate regulation.
Ac wiring
When operating at 25 kW with 100% modulation by a continuous sine wave, line currents are
approximately as shown in Table 5.1 on page 5-2
. Use this information to determine appropriate wire and breaker sizes for the ac input. NOTE: Primary wiring is provided by the end user.
Issue 3.2 2016-02-08 Page 5-1
NX25 Pre-installation Manual Electrical requirements
Table 5.1: Approximate Line Currents for NX25
380
360
340
320
460
440
420
400
Ac input voltage (V)
600
580
560
540
520
500
480
300
280
260
240
220
200
180
Line current (A)
76
80
85
91
62
65
68
72
53
55
57
59
46
47
49
51
98
105
114
124
137
152
NOTE : Line currents shown are based on operation at nameplate power, 100% continuous modulation and 10% low ac line. Ac wiring must also be rated to handle inrush current (12 x line current) for 0.1 s.
Page 5-2 Issue 3.2 2016-02-08
NX25 Pre-installation Manual Electrical requirements
Ac power switch
Install an external ac power disconnect between the ac power source and the transmitter. (Nautel can provide a suitable ac power disconnect, if required.) For safety, place the ac disconnect close to the transmitter and label it TRANSMITTER EMERGENCY ON/OFF SWITCH .
Ac transient power protection
Protect all conductors from the ac power source by connecting bi-directional surge protection devices between each conductor and the station reference ground. In addition, pass all the conductors and ground, as a group, through a ferrite toroid. Install a ferrite toroid on the ac feed between the transmitter and the bi-directional surge protector.)
• To obtain the proper size ferrite toroid, contact Nautel support for recommendations (see
), or consult additional, outside suppliers.
A surge protector panel containing suitably rated varistors is available from Nautel. Install the surge protector panel close to the station reference ground, and as close as possible to the ac service entrance.
The ac power source usually has the lowest impedance path to ground during a lightning strike and normally carries most of the lightning-induced current away from the transmitter site. When lightning hits the power source (for example, striking a transmission line near the transmitter site), a significant induced current may flow towards the transmitter. The goal of lightning protection is to route the current around the transmitter to the best available ground.
For detailed information about surge protectors and lightning protection, refer to Nautel’s
Recommendations for Transmitter Site Preparation Manual.
Recommended configuration.
Use a 4-wire Wye (star) configuration, with the three phases balanced to ground.
CAUTION:
Do NOT use open delta three-phase ac power sources that use two identical transformers. These systems are susceptible to third harmonic distortion and line transients, and may cause peak voltages to exceed the line voltage. This can cause increased power supply noise or even component failure (for example, rectifier failure).
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Station reference ground
Install a station reference ground that provides a continuous, low impedance path to the earth.
Connect the transmitter cabinet's designated safety ground point, the shield of the coaxial feedline, and the ground connection of the power source directly to the surge protector, using a 10 cm (4 in.) copper strap. Connect the surge protector to the station reference ground using a copper strap that is at least 10 cm (4 inches) wide.
Ac power enters the transmitter cabinet through the right side of the top panel (see
).
Ensure that the transmitter site’s grounding rods are adequate. For more information about electrical grounding protection, see Nautel’s Recommendations for Transmitter Site Preparation Manual.
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NX25 Pre-installation Manual RF output requirements
Section 6: RF output requirements
This section describes requirements associated with the antenna and RF cabling to be used with the
NX25 transmitter.
Antenna considerations include the following:
•
•
For detailed information about protecting the antenna system from lightning strikes, see the Nautel
Site Protection Manual .
Antenna feed cable
Maximum voltage
The maximum voltage at the transmitter’s connection to a 50 load is 4,350 V peak, when operating at 25 kW, with 100% modulation, at a VSWR of 1.5:1.
High voltage feed throughs
Be very careful whenever a high voltage RF conductor passes through a wall or bulkhead. Gas insulation flashovers can occur in poor installations. Ensure that this part of your installation is installed by professionals experienced with high-power radio frequency circuits.
Insulator flashover.
Surface flashovers along an insulator occur when there is an electrical breakdown in the gas (normally air) at its surface. The mechanism that triggers a flashover depends on the insulation surface conditions. Gas breakdown flashover occurs when one or more of the following conditions are met:
• The voltage field at the insulator surface or at an adjacent electrode reaches the critical breakdown level for the gas.
• The electrode or insulator interface is poor or dirty, resulting in a three material junction.
This creates excessive high voltage stress on the air insulator, causing a gas breakdown flashover.
• Moisture damage on the insulator surface creates regions of high voltage that can cause a gas breakdown flashover.
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Three-material junctions:
A frequent cause of breakdowns at an insulator surface is the junction of three materials: a metal conductor, a solid insulator, and a gas insulator. The insulators form a capacitive RF divider between the metal conductor and the grounded periphery. Since the dielectric constant of the solid is higher than the gas (air), the high voltage stress is concentrated on the air.
It is very important to minimize the junction's stress gradient and to avoid triple junctions wherever possible.
WARNING: FAILURE TO PROVIDE CORRECT STRESS CONTROL AT HIGH RF
VOLTAGE CONDUCTOR/INSULATOR JUNCTIONS CAN CAUSE INSULATOR
BREAKDOWNS OR EVEN FIRES.
Bowl type bushings.
Use bowl type bushing insulators to increase the surface tracking distance from the central conductor to the grounded periphery or wall.
Insulator Breakdown/Damage.
An insulator can be damaged during gas breakdown flashovers.
When current flows across the surface of an insulator, especially when it is coated with a conductive contaminant that is slightly damp, carbon tracks can form. Once this occurs, the track provides a conductive path and reduces the effectiveness of the insulator.
Pitting and erosion of the insulator may also occur. To reduce the possibility of tracking damage, clean all insulator surfaces periodically, and use stress control techniques at the conductor/insulator junction.
Other causes.
Other causes of breakdowns may include improperly adjusted spark balls or the disruption of air gaps by rain, snow, insects, birds, grass, or an accumulation of pollution (soot) on insulator surfaces.
Small radius conductors
Be careful when using small radius conductors to carry high RF voltages and currents. If the radius is too small it may cause a local corona, which can lead to a breakdown.
Feedline testing
Test the RF transmission system from the transmitter flange to the antenna before putting the transmitter into service. This is very important, especially if you are re-using an existing site with a previously installed feedline. Ensure that the entire system can tolerate the expected peak voltages of normal operation, especially those occurring during modulation peaks, without breaking down.
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NX25 Pre-installation Manual RF output requirements
Antenna system
Ensure that the antenna system meets or exceeds the standards specified in EIA Standard TR-101-A, paragraph 8(b) (see below for the specific requirement), with a normal impedance of 50 ohms at the carrier frequency.
• The impedance (resistance and reactance) characteristics of the normal load shall be such that when the operating carrier frequency changes by ± 5 kHz, the resistance will be within
5% of the resistance at the carrier frequency, and the reactance (adjusted to zero at the carrier frequency), will be within ± 18% of the resistance at the carrier frequency. When the carrier frequency changes by ± 10 kHz, the corresponding limits of permissible variation for resistance and reactance are 10% and 35% respectively.
The transmitter will operate with a maximum VSWR of 1.5:1, or with sideband VSWRs of up to 2:1 when the carrier frequency impedance is 50 ohms. However, overall system performance degrades as the VSWR increases.
Advances in digital modulation schemes like IBOC and DRM systems require better performance from antenna systems. To ensure the proper operation during digital broadcasting, ensure that the
VSWR does not exceed the values recommended by each standard.
In order to achieve the proper sideband symmetry (Hermitian symmetry) needed for IBOC or DRM operation, you may need to adjust the tuning of the antenna system to balance the impedances at the sidebands. You must perform a full impedance sweep of the antenna system before broadcasting
IBOC or DRM. This also requires information about the transmitter’s phase versus frequency charcteristic for Hermitian symmetry at the power amplifier. This information is provided with the transmitter at time of shipment. For assistance relating to IBOC or DRM transmitter requirements, contact Nautel Customer Support.
Note:
Hermitian symmetry may not be required for DRM if the VSWR across the bandwidth of the transmitted signal is very low. Contact Nautel for recommendations.
Issue 3.2 2016-02-08 Page 6-3
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NX25 Pre-installation Manual Planning audio inputs
Section 7: Planning audio inputs
The NX25 supports all current forms of AM broadcasting. This section describes the requirements associated with the audio feeds to the transmitter.
•
–
–
•
–
–
•
Other considerations - see page 7-3
–
Frequency synchronization signals - see page 7-3
–
Audio Player via USB - see page 7-3
–
Analog inputs
The transmitter does not have extensive audio processing capabilities. Use an external audio processor to ensure that the audio source material is processed properly. An audio processor will adjust the dynamic range, loudness, frequency response and symmetry parameters to suit the transmission system. Carefully control the peak levels.
For monaural applications, the audio may be processed to provide up to 135% positive peak program modulation, with a 25 kW RF carrier at the nominal ac voltage.
Refer to the Operating section of the NX25 Operations and Maintenance Manual for an example of setting an analog preset.
The NX25 accepts the following analog inputs:
Balanced (mono)
Modulating audio must be applied from an external source to BALANCED ANALOG AUDIO XLR connector J12 on the control/interface PWB (A11A1). The audio source must be balanced, able to drive a 600 load, and produce a level between -10 and +12 dBm for 100% modulation.
Only one analog input is provided. Program content from the input is applied to both exciters.
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AES/EBU
AES/EBU must be applied from an external source to ANALOG AES/EBU XLR connector J10 or J11 on the control/interface PWB (A11A1). The external source must produce a level between -30 and
0 dBFS for 100% modulation.
NOTE : Stereo broadcast is only possible by using one of the AES/EBU inputs.
Digital inputs
The NX25 accepts the following digital inputs:
IBOC
To use an IBOC (In Band On Channel) input, the NX25 requires the optional exgine PWB (A11A7).
The exgine PWB accepts the digital audio data from an Importer/Exporter arrangement via a LAN
(local area network) connection and, in conjunction with the control/interface PWB (A11A1), provides the LVDS signals (I and Q) to the exciter in CMOS format.
The digital audio data from the LAN/Exporter must be connected via an Ethernet cable to
ETHERNET connector J1 on the exgine PWB. The transmitter’s GUI allows configuration of the
IBOC input.
Refer to the Importer and Exporter documentation for more information.
Refer to the Operating section of the NX25 Operations and Maintenance Manual for an example of setting an IBOC preset.
DRM
To use a DRM (Digital Radio Mondiale) input, the NX25 requires an external DRM modulator module. The DRM exciter module accepts the digital audio data via a LAN connection and provides the baseband I and Q signals to AES/EBU connector J10 on the control/interface PWB (A11A1), in
AES/EBU format.
Refer to the DRM exciter module’s documentation for more information.
Refer to the Operating section of the NX25 Operations and Maintenance Manual for an example of setting a DRM preset.
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Other considerations
Frequency synchronization signals
You can apply a 10 MHz synchronization signal from an external source or using the optional GPS sync PWB, which can be installed in the transmitter.
Optional GPS sync PWB
A GPS sync PWB can be purchased that is capable of driving a 3.3 V or 5 V GPS antenna. If the optional GPS sync PWB is installed, it provides the necessary 10 MHz, 1 PPS and 1 kHz sync signals used by the exciter(s). The exciter uses these signals to synchronize the transmitter to this GPS reference. The GPS sync PWB connects to dual D-sub connector J5 of the control/interface PWB.
Externally sourced
If you are using an externally generated 10 MHz signal (such as a GPS clock signal) for use as the reference frequency for the RF drive (carrier frequency), connect it to the 10 MHz SYNC BNC connector J8 on the control/interface PWB. The external 10 MHz frequency reference must:
– remain stable at 10 MHz within ± 20 Hz
– have a peak-to-peak amplitude of between 2.2 V and 8.0 V (sine wave or square wave)
– be spectrally pure, since spurs may pass through to the transmitter output.
Audio Player via USB
There is provision to configure the transmitter’s audio player feature to use an external USB device connected to a USB port on the single-board computer (SBC). The files on the USB device (e.g., mp3 files) will act as the audio playlist. Refer to the Operations and Maintenance Manual for details on using the Audio Player’s Playlist feature, available through the remote AUI.
DRM Simulcast
For broadcasting in DRM simulcast, Nautel recommends applying the analog modultion input directly to one of the transmitter’s audio inputs, in addition to the digital I/Q over AES stream being applied to one of the transmitter’s AES inputs from the DRM modulator. This allows the transmitter to effectively manage its own power control and protection, as it normally would.
NOTE : Do not connect the analog modulation source to a DRM modulator and apply a combined analog and DRM signal to the transmitter. If the analog is combined with the DRM carriers by the
DRM modulator and applied to the transmitter as a single combined I/Q over AES stream, some of the normal transmitter protections will not function properly.
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NX25 Pre-installation Manual
Figure 7.1: Audio Connections
AUDIO
CABLE
ENTRY
10 MHz
SYNC
1 PPS
SYNC
I/Q
AES/EBU
ANALOG
AES/EBU
BALANCED
ANALOG
AUDIO
Planning audio inputs
A1
CONTROL/INTERFACE PWB
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NX25 Pre-installation Manual Planning control/monitor connections
Section 8: Planning control/monitor connections
This section describes the types of control and monitoring for the NX25 transmitter. Consider this information and plan for the necessary requirements (wiring, remote switches/indicators, LAN, etc.):
•
AUI control (local and remote)
•
External system interlock - see page 8-2
•
External PDM inhibit - see page 8-4
•
•
•
Analog outputs - see page 8-12
•
Web based control - see page 8-13
•
SNMP Control/Monitoring - see page 8-14
•
Nautel Phone Home - see page 8-14
AUI control (local and remote)
The NX25’s front door contains an advanced user interface (AUI) that allows you to locally control all transmitter functions and set parameters and schedules.
The remote AUI allows you to adjust any parameter and view any status available in the local AUI via a web browser on a computer connected to the LAN connector on the single-board computer’s motherboard (A1U1) on the back of the control cabinet’s front door.
The NX25 also allows control and monitoring through an Ethernet connection via SNMP, supporting version 1 of the protocol, with traps.
The local or remote AUI also allow you to configure the remote inputs to control various transmitter functions and monitor the transmitter’s status by means of a conventional, parallel wire remote
control interface (see “External system interlock”
and
) or an Ethernet connection (see
“Web based control” on page 8-13 ).
For detailed information about the AUI, refer to the NX25 Operating and Maintenance Manual .
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External system interlock
You can connect an external system interlock to terminal block TB1 (terminals 1 through 4) of the control/interface PWB (A11A1), located on the exciter panel behind the front door. This connection allows you to configure an external system interlock circuit for the NX25. This circuit can be configured as single-ended or differential, using user-provided shorting jumpers on terminal block
TB1 (see Figure 8.1 on page 8-3 ).
Single Ended Input (Internal dc supply).
If you are using the transmitter's 15 V as the current source for the system interlock circuit, install a shorting jumper between the +15V terminal (TB1-1) and the + terminal (TB1-2) and connect your system interlock circuit between the GND terminal
(TB1-4) and the – terminal (TB1-3).
The system interlock circuit must present a short circuit (low impedance) between TB1-4 and TB1-3 when the interlock circuit is intact and it is safe to enable the RF output. It must present an open circuit when any external interlock switch is activated and the RF output requires inhibition.
Differential Input (External dc supply).
If you are using an external dc supply (capable of providing between 12 V and 25 V) as the current source for the system interlock circuit, connect the supply’s positive output to the + terminal (TB1-2) and the supply’s ground (negative) output to the – terminal (TB1-3), via the system interlock circuit. No shorting jumper is required.
The system interlock circuit must present a short circuit (low impedance) between the external supply’s ground (negative) output and TB1-3 when the interlock circuit is intact and it is safe to enable the RF output. It must present an open circuit when any external interlock switch is activated and the RF output requires inhibition.
You can install any number of serial interlock switches provided the above conditions are met. If you are not using an external system interlock circuit, connect user-provided jumpers between TB1-1 and
TB1-2 and between TB1-3 and TB1-4.
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Figure 8.1: External Interlock and PDM Inhibit Circuits
Issue 3.2 2016-02-08 Page 8-3
NX25 Pre-installation Manual Planning control/monitor connections
External PDM inhibit
You can connect an external PDM inhibit to terminal block TB1 (terminals 5 through 8) of the control/interface PWB (A11A1), located on the exciter panel behind the front door. This connection allows you to configure an external PDM inhibit circuit that provides an emergency RF inhibit control for the NX25. This circuit can be configured as single-ended or differential, using user-
provided shorting jumpers on terminal block TB1 (see Figure 8.1
Single Ended Input (Internal dc supply).
If you are using the transmitter's 15 V as the current source for the PDM inhibit circuit, install a shorting jumper between the +15V terminal (TB1-5) and the + terminal (TB1-6) and connect your external PDM inhibit circuit between the GND terminal
(TB1-8) and the – terminal (TB1-7).
The external PDM inhibit circuit must present a short circuit (low impedance) between TB1-8 and
TB1-7 when the RF output requires inhibition. It must present an open circuit for normal operation.
Differential Input (External dc supply).
If you are using an external dc supply (capable of providing between 12 V and 25 V) as the current source for the external PDM inhibit circuit, connect the supply’s positive output to the + terminal (TB1-6) and the supply’s ground (negative) output to the – terminal (TB1-7), via the external PDM inhibit circuit. No shorting jumper is required.
The external PDM inhibit circuit must present a short circuit (low impedance) between TB1-8 and
TB1-7 when the RF output requires inhibition. It must present an open circuit for normal operation.
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Remote inputs
You can connect to up to 16 remote inputs, which allow you to remotely control various operational characteristics of the transmitter. Each input is mapped to a control that is user defined. See Table 8.1 on page 8-5 for a list of input options and their functional descriptions. See Table 8.2 on page 8-6 for the associated input terminals and control switches (see
“Backup control switches” on page 8-8
) on the remote interface PWB (A11A4). Refer to the NX25 Operations and Maintenance Manual for instructions on changing the remote input settings, including which setting is assigned to the input pin and which logic is required to change (activate, enable, etc.) the setting.
Unless otherwise noted these inputs are only accepted by the transmitter if the remote/local status is set to remote. That setting can only be made by a local user using the front panel AUI.
The external remote input circuits interface with the transmitter via the remote interface PWB and then with opto couplers on the control/interface PWB. The opto couplers buffer and isolate the external circuits and prevent any unwanted transients from affecting transmitter operation while remote control is selected on the transmitter.
Table 8.1: Remote Inputs - Selection Options
Remote Input
RF On
Function
Same as pressing the AUI RF On button. Tells the transmitter to provide RF power if possible. Provide an active pulse to select.
RF Off Same as pressing the AUI RF Off button. Tells the transmitter to disable RF power. Provide an active pulse to select.
Reset
Increase RF Power
Decrease RF Power Decreases the power level of the current mode. Send an active pulse to decrease the power slightly, or send a signal of greater duration to continue decreasing power.
Exciter A Select Causes a changeover to select exciter A as the active exciter. Provide an active pulse to select.
Exciter B Select
Causes a system reset. Provide an active pulse to select.
Increases the power level of the current mode. Send an active pulse to increase the power slightly, or send a signal of greater duration to continue increasing power.
Auto Exciter
Changeover
Causes a changeover to select exciter B as the active exciter. Provide an active pulse to select.
Enables or disables automatic exciter changeover. Provide an active pulse to toggle between selecting automatic or manual.
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NX25 Pre-installation Manual Planning control/monitor connections
Remote Input
Scheduler On/Off
Max Power Lockout
Select
Preset Select
Function
Enables or disables the automatic mode scheduler. Provide an active pulse to toggle between selecting automatic or manual.
Selects the associated power lockout limit (1 to 8) as active. Provide an active pulse to select.
Selects the associated user-named mode as the active preset. Provide an active pulse to select.
Table 8.2: Remote Inputs - Remote Interface PWB Circuits
Remote Input
1
14
15
16
12
13
10
11
8
9
6
7
4
5
2
3
Input Terminal
J7-8
J9-6
J9-4
J9-3
J8-4
J8-3
J9-8
J9-7
J7-2
J8-8
J8-7
J8-6
J7-7
J7-6
J7-4
J7-3
Switch
01
14
15
16
12
13
10
11
08
09
06
07
04
05
02
03
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External switching circuit requirements
The switching circuits for the remotely controlled functions must be the equivalent of a normally open (momentary) switch. The switches must be configured to operate as a single-ended input using the transmitter's 15 V dc as the source, or as a differential input using an external dc power supply
(12 - 18 V) applied to J6-7 or J6-8. The control/interface PWB contains a selection circuit that allows you to select internal (single-ended, see Option 1) or external (differential, see Option 2) dc power supply for all remote inputs.
Inputs are toggled between states by an active pulse unless otherwise noted. To ensure proper operation, the duration of the active pulse should be a minimum of 250 ms. Refer to the NX25
Operations and Maintenance Manual to see the various logic control options for remote inputs.
Option 1 - Single Ended Input (Internal dc supply).
When you use the transmitter's 15 V as the current source for a control function's opto coupler, configure the circuits on the control/ interface PWB for single ended inputs (see Figure 8.2
). The INT/EXT 3-pin header (E3) must have its
2-socket shunt post connected between pins 2 and 3 to configure the circuit.
Figure 8.2: Single-Ended Input Selected
+15 V INPUT
GND
J6-7/8
J6-5/6
REMOTE
INTERFACE
PWB
+15V
1
E3
3
INT
2
CONTROL/
INTERFACE
PWB
DIGITAL INPUT (01 TO 16)
01 TO 16
REMOTE SELECTION CIRCUITRY
CONFIGURED FOR INTERNAL
DC SUPPLY
S2070500 V1
When the remote input is configured for logic ‘0’, a negative logic (current-sink-to-ground) command must be applied to the appropriate remote input (1 through 16). To avoid a ground loop, obtain the ground from the remote interface PWB (J7-1 or 5, J8-1 or 5, or J9-1 or 5).
Option 2 - Differential Input (External dc supply).
When you use an external dc voltage
(12 V to 18 V) as the current source for a control function's opto coupler, configure the control function's external switching circuit and the control/interface PWB’s selection circuit for a differential input (see Figure 8.3 on page 8-8 ). The INT/EXT 3-pin header (E3) must have its 2-socket shunt post connected between pins 1 and 2 to configure the circuit.
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NX25 Pre-installation Manual
Figure 8.3: Differential Input Selected
EXTERNAL DC
PWR SUPPLY
(+12V TO +18V) J6-7/8
REMOTE
INTERFACE
PWB
Planning control/monitor connections
+15V
E3
1 EXT 2
3
CONTROL/
INTERFACE
PWB
DIGITAL INPUT (01 TO 16)
01 TO 16
REMOTE SELECTION CIRCUITRY
CONFIGURED FOR EXTERNAL
DC SUPPLY
S2070501 V1
The normally open/momentarily closed switch should be located between the dc supply's negative output and the remote input.
Backup control switches
The remote interface PWB contains a push-button switch [ 01 (S1) through 16 (S16)] for each of the
16 remote inputs. Each switch provides a means to locally activate its associated remote input in the event that the associated AUI control is not available. See Table 8.2 on page 8-6 to determine the switch associated with each of the remote inputs.
Below each switch is a blank, white label to allow for labelling of the control.
Remote input connections
Remote inputs 1 through 16, as required, connect to the terminals of connectors J7, J8 and J9 on the remote interface PWB (A11A4). See Table 8.2 on page 8-6 to determine the input terminal associated with each remote input.
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Remote outputs
Up to 16 remote outputs, that indicate either the presence of various alarms or the status of operator controlled circuits, are available for remote monitoring on connectors J3, J4 and J5 on the remote interface PWB (A11A4). The sources and active logic levels of these remote outputs are user-defined.
See Table 8.3 on page 8-10 for a list of output options and their descriptions. See Table 8.4 on page 8-11 for the associated output terminals and status LEDs (see
remote interface PWB.
A switching device for each remote output provides the desired active logic when a true condition exists. Nautel presets all remote outputs for Logic ‘0’ Active.
If the remote output is configured as Logic ‘0’ Active (see the NX25 Operations and Maintenance
Manual ), then the remote output’s switching circuit will provide a current-sink-to-ground when a logic true condition exists and an open collector for a logic false condition.
If the remote output is configured as Logic ‘1’ Active (see the NX25 Operations and Maintenance
Manual ), then the remote output’s switching circuit will provide an open collector when a logic true condition exists and a current-sink-to-ground for a logic false condition.
LED configuration
The remote interface PWB contains a bi-colour LED (DS1 through DS16) and a shorting jumper
(E1 through E16) for each of the 16 remote outputs. Each LED can be configured to glow green for a status output or red for an alarm output, by setting the position of the associated shorting jumper.
For a status output, install the shorting jumper to short positions 1 and 2 of its post. For an alarm output, install the shorting jumper to short positions 2 and 3 of its post. See Table 8.4 on page 8-11 to determine the LED and shorting jumper associated with each remote output.
Below each LED is a blank, white label to allow for labelling of the status/alarm output.
Remote output connections
Remote outputs 1 through 16, as required, connect to terminals of connectors J3, J4 and J5 on the remote interface PWB (A11A4). See Table 8.4 on page 8-11 to determine the output terminal associated with each remote output.
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Table 8.3: Remote Outputs - Selection Options
Remote Output
Remote Status
RF On Status
Exciter A Status
Auto Exciter
Changeover Status
Main Exciter Status
Mode Scheduler
Status
Various Alarms
Watchdog Reset
Preset Status
Max Power Lockout
Status
Remote Input
Description
Indicates the local/remote control status of the transmitter. Logic true if transmitter is in remote mode. Logic false if transmitter is in local mode. Changes can only be made remotely if the transmitter is set to remote mode. The local user’s control of transmitter operation is limited, unless the transmitter is set to local mode.
Indicates the on/off status of the transmitter’s RF power stage. Logic true is RF is enabled.
Indicates which exciter is presently active. Logic true if exciter A is active. Logic false if exciter B is active.
Indicates the status of the auto exciter changeover function. Logic true if enabled (auto).
Logic false if disabled (manual).
Indicates which exciter is selected as main. Logic true if exciter A is main. Logic false if exciter B is main.
Indicates the status of the mode scheduler function. Logic true if enabled (scheduler). Logic false if disabled (manual).
Logic true condition indicates the associated alarm is occuring. Logic false if it is not occuring.
Must be configured as Remote Output 1 . Indicates that a watchdog reset is occurring, due to an error in communication between the Controller and the single-board computer.
Indicates that the associated user-named mode is currently active.
Indicates that a maximum power lockout limit (1 to 8) has been selected..Logic true if the lockout has been selected. Logic false if the lockout has not been selected.
Mimics the logic of the associated remote input selection. Example: If Remote Output 5 is set to Remote Input, it will mimic the logic received on remote input pin 5. This is typically used for debugging remote inputs.
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Table 8.4: Remote Outputs - Remote Interface PWB Circuits
Remote Output
1
2
13
14
11
12
15
16
9
10
7
8
3
4
5
6
Output Terminal
J3-8
J3-7
J4-3
J5-8
J5-7
J5-6
J4-8
J4-7
J4-6
J4-4
J5-4
J5-3
J3-6
J3-4
J3-3
J3-2
Status LED
DS1
DS2
DS11
DS12
DS13
DS14
DS7
DS8
DS9
DS10
DS15
DS16
DS3
DS4
DS5
DS6
Shorting Jumper
E1
E2
E11
E12
E13
E14
E7
E8
E9
E10
E15
E16
E3
E4
E5
E6
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Analog outputs
The transmitter provides sample signals that let you monitor transmitter performance. The sources of these analog outputs are pre-defined and configured at Nautel. See Table 8.5
for a list of these predefined outputs, their descriptions and their associated output terminals on the remote interface
PWB. The outputs are op-amp buffered outputs from an analog-to-digital converter (ADC). The dc voltage of each output is between 0 to 6 V, and varies within the real limits of the parameter being monitored. The monitoring circuit’s impedance for each analog output must be greater than 1,000 ohms.
In addition to the four pre-defined analog outputs, a true RF sample of the RF output voltage waveform is available for external monitoring.
Analog output connections
Analog outputs 1 through 4 connect to terminals of connector J6 on the remote interface PWB
(A11A4). See Table 8.5
to determine the output terminal associated with each analog output.
Table 8.5: Factory Defined Analog Outputs
Analog Output Description
1. Forward Power Reports a sample of the transmitter’s forward power level. This dc voltage is a pure square law function and will be full-scale (6 V) when the forward power is 25 kW.
Output Terminal
J6-4
2. Reflected
Power
J6-3
3. B+ Voltage
4. Dc Current
Reports a sample of the transmitter’s reflected power level. This dc voltage is a pure square law function and will be full-scale (6 V) when the reflected power is 4 kW.
Reports a sample of the control cabinet’s B+ dc voltage level. This dc voltage is a linear function and will be full-scale (6 V) when the B+ voltage in the control cabinet is 400 V.
Reports a sample of the dc current level. This dc voltage is a linear function and will be full-scale (6 V) when the dc current is 125 A.
J6-2
J6-1
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Web based control
An Ethernet port is available on the SBC’s motherboard (A1U1) on the back of the control cabinet’s front door. This port allows a user with proper authentication to remotely control and interrogate the
NX25’s operational status. Most functionality available on the front panel AUI is available remotely, provided the user has been granted proper authorization (refer to the NX25 Operations and
Maintenance Manual for details on setting user permissions). Nautel recommends you use shielded
Cat5 cable or better to make this connection.
Remote Access
The only access to the AUI is through the LAN connector on the control/interface PWB (A4).
For security purposes, Nautel recommends you place your transmitter behind a router acting as a firewall. To allow remote AUI access to a transmitter behind a firewall, the firewall must allow TCP traffic through the following ports:
• TCP port 80: required to allow the web browser operating on the remote computer to access the web server operating on the transmitter.
• TCP port 3501: used for regular AUI-to-transmitter communication. Also used to perform a security check to allow the remote web browser to access AUI content from the transmitter’s web server .
• TCP ports 161 and 162: Used for SNMP Agents and Traps, respectively.
For security purposes, Nautel recommends you block the following port:
• TCP port 22: block during normal operation; when required, may be used to allow Secure
Shell (SSH) programs such as PuTTY, etc. to access the transmitter.
Once your transmitter is isolated behind a firewall, there are a variety of standard network management techniques that can be used to establish a connection, including routing tables and a virtual private network (VPN).
Detailed information about network management is beyond the scope of this manual. Selecting a specific technique may depend on your existing network configuration. Nautel recommends that the planning, implementation and ongoing support of a network that includes a transmitter be performed by a team that includes at least one member with suitable knowledge of network management.
NOTE : If you have more than one transmitter on the same LAN, you will need to use port forwarding to allow access to individual transmitters on the network.
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SNMP Control/Monitoring
SNMP (Simple Network Management Protocol) is a request-response protocol where the client and agent communicate using binary packets. For Nautel transmitters, SNMP is used to communicate transmitter control commands (e.g., RF on/off, main exciter, active preset, power adjustments, etc.) as well as monitor data such as alarm states and meter values. Although there are three different versions of the protocol in widespread use (SNMPv1, SNMPv2c and SNMPv3), Nautel only supports SNMPv1.
Nautel provides the central software component, the SNMP agent, which is a program that runs on the transmitter. The SNMP agent interacts with SNMP client software applications, which range from simple MIB browser applications like the free one provided by iReasoning to customized solutions such as those provided by Burk. Nautel does not provide SNMP client software.
Access to SNMP control/monitoring is through the ETHERNET/USB connector (J3A) on the control/interface PWB (A4). When you log into the remote AUI, you can access the User Settings ->
SNMP Configuration page to set the SNMP Agent Port number, Read Community and Write
Community passwords and SNMP Trap information.
If you are planning to use SNMP, contact Nautel to obtain MIB files for your client software.
MIB files are available through Nautel’s FTP site: ftp://www3.nautel.com/SNMP_MIBs/
Email Server
The transmitter’s remote AUI allows you to configure an email notification feature, which can initiate emails to specified users when specific alarm or status conditions occur (refer to the NX25
Operations and Maintenance Manual for details).
The NX25 supports email servers that are unsecure and secure; requiring authentication (user name/ password) as well as encryption. Consult with your network administrator for more details.
Nautel Phone Home
Phone Home is a system developed by Nautel that takes advantage of the vast amount of data collected by Nautel transmitters by proactively sending information to Nautel via the internet once a user enables Phone Home on their transmitter.
This data includes logs, alarms and meter readings which are then stored in a database and can be analyzed by Nautel Customer Service if an alarm is reported by the transmitter. Since all data is pushed out to Nautel by the transmitter, there is no need to reconfigure your firewall and potentially compromise your transmitters security. All data transfers are one way.
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Nautel transmitters are intelligent, collecting data on nearly every aspect affecting your transmitter’s performance. When this data is used by Nautel Customer Service staff for diagnostic purposes it cuts down on repair time and gets you back on air faster.
Nautel Customer Service technicians can use Phone Home to analyze data in real time, even accessing the live AUI, or to view the state of a customer’s transmitter at any time leading up to a fault.
This unique diagnostic approach allows Nautel support staff to review the events leading up to and during an alarm occurrence, giving customer service technicians valuable insight into how your transmitter is behaving before, during and after an alarm and how this behavior may be related to the alarm event.
If you are planning to participate in the Nautel Phone Home feature, no pre-installation actions are required. After successfully installing your NX25 and connecting to the remote AUI, navigate to the
User Settings -> Nautel Phone Home page and enter your serial number and email (optional).
Nautel will begin to monitor your transmitter’s performance.
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Page 8-16 Issue 3.2 2016-02-08
NX25 Pre-installation Manual Parts and tools
Section 9: Parts and tools
This section describes parts associated with the NX25 transmitter, and tools needed during installation and routine operation. Topics include:
•
•
Parts not supplied by Nautel - see page 9-2
•
•
Module replacement program - see page 9-2
•
Tools for installation - see page 9-3
Contacting Nautel
You can reach Nautel to order parts or for technical assistance at:
Nautel Limited
10089 Peggy’s Cove Road
Hackett’s Cove, NS Canada B3Z 3J4
Phone: +1.877.628.8353 (Canada/US)
+1.902.823.5100 (International)
Fax: +1.902.823.3183
Email: [email protected]
Web: www.nautel.com
Parts supplied by Nautel
Ancillary parts kit
An ancillary parts kit is shipped with the NX25. This kit contains hardware needed during the installation process. The kit includes toroids, spare fuses, screws and other miscellaneous hardware.
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Parts and tools NX25 Pre-installation Manual
Documentation
See “NX25 transmitter manuals” on page xii.
Parts not supplied by Nautel
Some parts and materials required to complete installation are not supplied by Nautel. The parts you need vary with the installation requirements. The list of parts you normally provide yourself during installation include:
• A suitable 50 RF output coaxial cable, terminated by the proper connector, complete with center male connector at the transmitter end.
• All external control and monitor wiring, including the associated terminating devices, conduit and conduit clamps.
• All electrical power cables, including conduit, terminating devices, and conduit clamps.
Parts ordering
You can order replacement parts from your Nautel sales agent, or directly from Nautel through the
Nautel website.
Module replacement program
Nautel offers a module replacement program for customers who require expedited servicing and replacement of faulty modules. The module replacement program provides immediate replacement of failed modules with refurbished modules.
• The replacement module is shipped to the customer as soon as the customer reports the failure. The customer then returns the failed module to Nautel using the same shipping package.
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NX25 Pre-installation Manual
Tools for installation
The tools you need during transmitter installation include the following:
• Digital voltmeter
• Philips screwdrivers, sizes #1 and #2
• Pliers
• Wire cutters
• Slot screwdriver, 5 mm (3/16 inch)
• Metric and Imperial socket set up to 24 mm (15/16 inch)
• Metric and Imperial wrench set up to 25 mm (1 inch)
• Feeler gauge (to measure spark gap)
• Torque wrench (capable of up to 275 in-lbs or 31 N-m)
Parts and tools
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NX25 Pre-installation Manual Pre-installation assistance
Section 10: Pre-installation assistance
Nautel provides a number of support options to help you during pre-installation planning and preparation:
•
•
Installation and commissioning service
•
Online documentation - see page 10-2
•
On-site support - see page 10-3
•
•
Extended warranties - see page 10-4
Pre-installation consulting
Nautel field support specialists are available to answer questions and work with you to ensure that your site will be ready for the installation of your NX25 transmitter. For support, contact Nautel Customer
Service and request assistance (see “On-site support” on page 10-3
).
Installation and commissioning service
Nautel offers an installation and commissioning service to customers who want assistance with configuring and commissioning a new Nautel transmitter. After the customer completes the transmitter assembly and installation, Nautel technical personnel will spend up to three days on-site to help make the ac power, RF and remote connections, and to assist with the configuration and testing of Nautel equipment.
The customer is responsible for ensuring that the following stages of installation have been completed, prior to the arrival of Nautel personnel:
• Ac power wiring for the transmitter has been installed and connected at the breaker panel or the building’s service entrance.
If local electrical codes allow Nautel personnel to connect the transmitter to the ac supply, using the customer's cable, that task is included in this service. Otherwise, the customer must ensure that an approved electrician is present for this task.
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• The customer has prepared the RF coaxial cable – used to connect the transmitter to the antenna – and installed the required connector. The customer has also installed the RF coaxial cable in place and connected it to the antenna, while leaving the transmitter end of the cable unconnected.
• Where required, all remote control and monitoring cables have been installed and connected to the station equipment (e.g., modulation monitor, frequency monitor, and power meter).
• The site has been made ready for the equipment, and adequate protection against lightning and lightning-induced transients has been provided.
• The transmitter has been unpacked, closely checked for any damage caused by shipping, and then assembled.
• The following test equipment has been made available at the site:
– Two-channel oscilloscope (with probes)
– Audio signal generator
– Distortion analyzer
– Modulation monitor
– Frequency counter
– 50 test load (rated for 150% of carrier power, VSWR less than 1.1:1)
Nautel’s service representative takes full responsibility for commissioning the transmitter, validating all external interfaces (i.e., the ac supply, RF output, remote control and monitoring equipment) and checking out the equipment prior to activation. The service representative turns on the transmitter, performs all adjustments and set-up procedures, and carries out proof of performance tests at the site.
These tests ensure that the transmitter is operating normally in compliance with its specifications.
The service representative also provides a demonstration and a short explanation of the operation of the transmitter. Finally, the customer signs an Acceptance of Installation Certificate that provides feedback to Nautel regarding the commissioning service.
Online documentation
Nautel provides documentation online to customers, letting you familiarize yourself with specifications, operation, maintenance and troubleshooting prior to the delivery of your equipment.
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NX25 Pre-installation Manual Pre-installation assistance
• Documentation is also provided on CDROM and in paper binders that are delivered with the transmitter.
On-site support
If you require on-site assistance, Nautel’s field support specialists can help you prepare your site, and ensure that your NX25 transmitter installation can proceed as quickly as possible. For more information about onsite support, including scheduling and pricing, contact Nautel Customer
Service:
• Telephone: +1.902.823.5100
• Fax: +1.902.823.3183
• Email: [email protected]
After business hours (Atlantic time or Eastern time in North America), requests sent by fax or email will be acknowledged within one working day.
Training
Nautel's SBE-certified broadcast training programs satisfy your day-to-day knowledge requirements.
Students participating in Nautel's broadcast transmitter or RF basics training programs earn one SBE credit for each completed day of training. Nautel’s comprehensive selection of training programs will help a customer’s staff develop valuable skill sets, reduce downtime, and make the most of the customer’s technology investment.
Nautel training programs are made up of individual modules that can be mixed and matched to meet the customer’s specific training needs. All Nautel training courses are available at the Nautel Training
Center. Training can also be provided at the customer’s facility, for training the customer’s technical staff on the customer’s transmitter.
All Nautel training courses combine classroom and hands-on laboratory work to ensure a balanced learning experience. Many of our classes also include diagnostic lab exercises.
Nautel training courses feature:
• Limited class sizes to ensure maximum student participation and access to equipment
• Emphasis on need-to-know, day-to-day knowledge
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NX25 Pre-installation Manual Pre-installation assistance
• Labs that focus on the tasks most often performed at the transmitter site.
NX series on-site or factory training
This includes product overview, site and pre-installation, theory of operation, testing and adjustments, operating instructions, system-level troubleshooting, component-level troubleshooting, component parts lists, and wiring route sheets.
Extended warranties
Nautel's standard four-year warranty provides excellent coverage and satisfies most customers’ needs. However, if you want extended coverage, Nautel offers one- and two-year Extended Warranty
Plans to cover electrical and mechanical repairs or replacements for all Nautel equipment.
Coverage
The Extended Warranty Plan includes:
• A module exchange program for many common modules and circuit boards (North America only)
• Toll-free hotline (North America only)
• Necessary labor performed by Nautel authorized personnel to repair the product to meet factory specifications
• Necessary components
• Modifications to correct performance problems
• Return shipping.
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Details
Extended Warranty Plans must be purchased prior to the expiration of original four-year warranty.
One-year Extended Warranty Plans add an additional year (12 months) of coverage after the end of the customer’s standard four-year warranty. The two-year plan adds an additional two years (24 months).
Only repairs done at Nautel's facilities or by Nautel authorized personnel will be covered by the
Extended Warranty Plans.
You must ship faulty products back to Nautel, prepaid, and in the original package or in a package that provides equivalent protection.
Nautel can choose to repair or replace equipment.
Purchasing a one- or two-year Extended Warranty Plan
If the transmitter is still covered by its original four-year warranty period, you can contact Nautel by telephone, fax, mail, or email with the model number, serial number and date of purchase.
Once you purchase a Nautel Extended Warranty Plan, you receive an extended warranty plan certificate, plan number, and a toll-free number (North America only) to call for any service-related issues.
Using the Extended Warranty Plan
Contact Nautel's Canadian or U.S. service facility by phone, fax, or email as soon as a problem occurs.
The following will be required when contacting Nautel:
• Extended warranty plan number
• Product model number
• Serial number
• Brief description of the problem
If Nautel’s service technicians are unable to solve the problem over the telephone, Nautel will give you an RMA number. You then return the module or circuit board to a Nautel service facility, so that
Nautel can provide a replacement. Do not ship a component back to Nautel until you have an RMA number.
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NX25 Pre-installation Manual List of terms
SECTION 11: List of terms
This section defines some of the terms that are used in Nautel documentation.
ADC.
Analog to Digital Converter.
AES-EBU.
Audio Engineering Society/European Broadcasting Union (AES/EBU) is the name of a digital audio transfer standard. The AES/EBU digital interface is usually implemented using 3-pin
XLR connectors (the same type connector used in professional microphones). One cable carries both left and right-channel audio data to the receiving device.
B+.
The high voltage dc generated by the transmitter’s ac power supply for use within the transmitter.
The B+ voltage is used to supply the transmitter’s modulators and other transmitter circuitry.
Cutback.
A reduction in RF output power, caused by a total power limit fault or the occurrence of three shutbacks within a five second period.
DAC.
Digital to Analog Converter.
DAM.
Dynamic Amplitude Modulation.
DCC.
Dynamic Carrier Control.
DRM.
Digital Radio Mondiale. A set of digital audio broadcasting technologies designed to work existing AM radio channels.
DSP.
Digital Signal Processing.
FPGA.
Field Programmable Gate Array.
HD Radio.
HD Radio is another term for In Band On Channel (IBOC) technology. HD Radio is a trademark of iBiquity Digital Corporation.
IBOC.
Nautel In-Band-On-Channel technology provides high quality digital audio over existing AM radio channels.
IPM.
Incidental Phase Modulation
Latching alarm.
An alarm that, while active, keeps the transmitter in an ‘RF inhibited’ state. This type of alarm (e.g., High SWR Shutdown) require a reset - locally or remotely - to attempt to restore transmitter operation.
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NX25 Pre-installation Manual List of terms
NE IBOC.
Nautel’s In-Band-On-Channel signal generator. See IBOC. Required for NX series IBOC installations.
PDM.
Pulse Duration Modulation.
Preset.
A setting that controls power level, active exciter, and power scheduler status on a time-ofday and date basis. Exciters can be configured on a preset for a specific operating mode (for example,
Exciter A - conventional AM, and Exciter B - IBOC). The NX25 allows you to pre-program multiple presets.
Shutback.
A complete loss of RF output power, caused by any one of a variety of faults, including high VSWR, low B+ voltage, high RF current, RF drive failure, external interlock or spark gap.
Surge protection board.
An electrical panel that protects equipment from electrical surges in the ac power supply, antenna or site ground caused by lightning strikes.
VSWR.
Voltage standing wave ratio. This is an expression of the ratio of forward voltage to reverse voltage on the feedline and antenna system. An ideal VSWR of 1:1 provides maximum transmitterantenna efficiency.
Page 11-2 Issue 3.2 2016-02-08
NX25 PRE-INSTALLATION MANUAL
Document: NHB-NX25-PRE
Issue: 3.2 2016-02-08
Nautel Limited
10089 Peggy’s Cove Road
Hackett’s Cove, NS Canada B3Z 3J4
Toll Free: +1.877.6NAUTEL (662.8835)
(Canada & USA only) or
Phone: +1.902.823.3900 or
Fax: +1.902.823.3183
Nautel Inc.
201 Target Industrial Circle
Bangor, Maine USA 04401
Phone: +1.207.947.8200
Fax: +1.207.947.3693
Customer Service (24-hour support)
+1.877.628.8353 (Canada & USA only)
+1.902.823.5100 (International)
Email: [email protected]
Web: www.nautel.com
© Copyright 2016 NAUTEL. All rights reserved.
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