NX Series High Power - AM/MW/LW
NX Series High Power - AM/MW/LW
B15 Brisbane, Australia
Presented by Chuck Kelly
NX High Power AM/MW/LW
Agenda
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Introduction
NX Series Overview
NX Digital
NX Efficiency
NX Control
Firmware Release 4 Quick Summary
NX Combiner
NX Long Wave
Nautel Systems Integration
Nautel Support
Your questions
NX High Power AM/MW/LW
NX High Power AM/MW/LW
NX Series: High Power Solid-State
NX Innovation
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Industry’s top efficiency: up to 90%
Adaptive pre-correction
RF + audio spectrum analyzers
1.8 MHz Direct digital modulation
Intuitive touch-screen interface
Ultra-compact
Digital: All DRM modes + HD Radio
NX5/10
NX200
NX50
NX25
NX300
NX100
NX400
Combined Solutions up to 2MW
NX High Power AM/MW/LW
NXSeries: 100kW Building Block
Ultra-compact !
• NX25 / NX50 / NX100: Same size cabinet
• NX100 and higher have small external
transformer cabinet which can be mounted
adjacent to or remotely
44”
(1.12m)
NX High Power AM/MW/LW
72.5”
(1.84m)
38”
(0.96m)
RF Driver
PS
Fan
PS
Fan
PS
Mod Drive
1-3
2.5kW
Mod Drive
4-6
2.5kW
Mod Drive
7-9
2.5kW
RF Drive
Manual
Control
Mains
Transformer
2.5kW
Controller
PS
Phase Control
Rectifier
2.5kW
....
15” LCD GUI
Controller
PS
2.5kW
40 Modulator /
RF Amps
Choke Input
Filter
NX High Power AM/MW/LW
400V DC
Series Combiner
RF Driver
PS
Main/Alt Supervision / Control
TCP/IP
Webserver /
Remote Control
Optional
GPS
Audio Inputs:
AES/EBU,
Analog L&R, I&Q
DSP
Exciter
DSP
Exciter
NX100: Block Diagram
Dual T Output
Matching Network
Dynamic Pre-Correction
“The NX Series of AM transmitters are the first high power AM
transmitters to be provided with Dynamic Pre-correction”
• Corrects primary forms of distortion
• Applies to analog + digital broadcasting
• More Linear – Clean Spectrum
• Adaptive envelope equalization
• Adaptive AM-AM correction
• Adaptive AM-PM correction
NX High Power AM/MW/LW
Performance Results - AM
No visible distortion in the trough with AM to AM correction
NX High Power AM/MW/LW
Main/Alternate Supervision & Control
• Interfaces dual DSP exciters
• Provides uninterrupted modulation + RF
• Dual AES/EBU inputs, Analog L&R, and
I&Q inputs.
• Optional GPS input card for ultimate
frequency accuracy.
• Parallel remote control
• Full web server TCP/IP control.
• Failsafe manual basic control.
NX High Power AM/MW/LW
RF Amplifier / Modulator Module
Hall Effect Current Sensor
Replaceable Fuse
200A FET’s
Replaceable with
just a screwdriver
Modulator
Input RJ45
Drive
Transformers
RF Driver
Modulator
98%
RF Amplifier
12kW continuous power rating
(NX module operated at 2.5kW of carrier)
PA Efficiency
NX High Power AM/MW/LW
RF Amplifier/Modulator Module
Modulator Stage
SiC Rectifiers
(x3)
RF Amplifier Stage
Q3
Q1
Q5
400 VDC
B+ Supply
Output+
OutputQ2
Q6
Digitally
Controlled
Modulator
Drivers (x3)
Q4
Modulator
Filter
Q7
Modulator FET
(x3)
NX High Power AM/MW/LW
Digitally Controlled RF
Drivers (x4)
RF FET
(x4)
RF Amplifier / Modulator Module
• No adjustments – no pots
• Broadbanded – entire AM band
• Hot pluggable
• Heavy gold connectors both sides
• Heat sink: 2.5 x required size
• High Efficiency Silicon Carbide modulator
diodes
• Balanced RS422 modulator and RF drive.
NX High Power AM/MW/LW
Series Combiner
• Consists of a two parallel
copper pipes with ferrite cores
which couple the RF output.
• Can handle many times the
required power.
• Broadbanded.
• Module isolation relay is one
of only two moving parts in the
NX (the other is the fans)
NX High Power AM/MW/LW
Output Network
• The Output Network is the ONLY
frequency dependant section in the
NX Series.
• Consists of two T networks, with a
shunt 3rd harmonic trap.
• This is a low Q filter, which provides
minimal amplitude and phase
distortion to the RF signal.
• Adjustment of the NX series from
one frequency any other in the AM
band may be accomplished in just a
few hours.
• Kit with frequency dependant parts
for all MW frequencies is available.
NX High Power AM/MW/LW
Combiner/Filter & Transient Protection
Voltage and Current
Measurement for Active
Protection
Series Resonant High Pass Section
Harmonic Filter
Output
PA_n
Forward and Reflected
Directional Coupler Ports for
Spectrum Verification
RF Amplifiers
PA_2
Adjustable Carbon Ball Gap
Combiner Transformers
PA_1
Calibrated Fast Spark Gap
(Pressurized Tritium)
Frequency Agile: Harmonic Filter Re-Tune in a Few Hours
NX High Power AM/MW/LW
Lightning/Transient/AC Protection
• ~10 uS Active VSWR Shutdown
• Series Capacitor/High Pass Stage
• Carbon Adjustable Ball Gap
• Static Discharge Choke
• Calibrated Fast Spark Gap
(Pressurized Tritium)
• MOV Protection on Incoming AC
• Transient Attenuator Capacitors on
AC Transformer Secondary (Common
Mode)
• AC Surges Corrected by Phase
Controlled B+ Rectifiers (Differential
Mode)
NX High Power AM/MW/LW
NX50 Power Transformer
Three-phase primary
winding tap nominal
voltages (rms, phaseto-phase)
NX High Power AM/MW/LW
Cooling
• 10 Ball Bearing DC Fans arranged in
hot pluggable trays – two for each tray.
• Transmitter will operate with just one
working.
• Typical fan life is over 11 years.
• Fan operation and speed is
monitored by the controller.
• In a 100kW transmitter, only 10kW of
heat is produced, about the same as a
typical 10kW FM transmitter.
• Air is drawn in from the rear, through
a washable metal air filter.
NX High Power AM/MW/LW
Power Supplies
• Three phase AC power of a broad range
of configurations are fed through a large,
high efficiency transformer in a separate
cabinet. 250V three phase is fed to the
transmitter.
• The 250V feed is rectified through a phase
controlled three phase rectifier bank which
provides voltage control and soft start.
• Ten large fuses protect banks of 4
modules.
• Filtering is done by dual choke input filters
with a large bank of electrolytic capacitors.
• All LVPS (Controller, RF Drive, Fan) are
completely redundant.
NX High Power AM/MW/LW
NXSeries Digital Radio leadership
The Nautel NX series leads the industry in Digital Radio development
• Whether it’s for DRM or HD Radio, Nautel has
pushed the performance limits.
• Advanced PAPR and linearization algorithms
provide more RMS power from a given power
transmitter with better MER.
• Continuing development has further improved alldigital performance. See Brian Walker’s paper at
NAB 2014.
• Feeds the transmitter with true digital I/Q signals
for best performance.
• All modes and bandwidths supported.
NX High Power AM/MW/LW
Advanced DRM modes
Simulcast
NX High Power AM/MW/LW
20 kHz DRM
NXSeries: All digital HD Radio
NX High Power AM/MW/LW
NX Efficiency
The Nautel NX is the world leader in high efficiency AM transmission
Highest efficiency:
86% for NX5 and NX10
88% for 25kW and 50kW
90% for NX 100kW and higher
Even more power savings:
Modulation Dependant Carrier Level (MDCL)
standard
all 5 popular algorithms are included
up to an additional 30% savings in electrical costs
no discernable coverage or performance reduction.
“With reduced electrical costs the purchase price of an NX can often be
paid off in just a few years when compared to older tube and solid state designs.”
NX High Power AM/MW/LW
NX Firmware Release 4
Nautel offers continuous development and improvement to its products
• the result of over a year of development
• includes both feature enhancements and bug-fixes
• creates common code + feature set for all Nautel AUI based products
- including NV, NVLT, NX, and VS.
New features include:
• MER metering
for TLS secured SMTP servers
• Support
• Port forwarding
• Ability to save user selected AUI meters
to save critical parameters remotely
• Ability
• SNMP traps
• Remote AUI timeout
user account capabilities
• Customizable
• Redesigned scheduler
NX High Power AM/MW/LW
• Network Time Protocol
Unique OS password enabled
• Ability
to add Call Sign to AUI banner
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• Multi phase PDM cancellation routine
resulting in improved RF spectrum
• Summary alarms for remote interfacing
• ‘take action’ on audio loss
Audio (Nautel USB adapter required)
• USB
• Icecast/Shoutcast capable
NXSeries: Scalable to 2MW
• High power building blocks:
– 100, 200, 300 or 400kW systems
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Combiners: 2, 3, 4 or 5 port
Even greater redundancy
Nautel Dummy Loads
2MW: 5 port combined NX400
1600kW
NX High Power AM/MW/LW
800kW
1200kW
2000kW
NXC Combiner Control
NXC 800
NX High Power AM/MW/LW
NX High Power AM/MW/LW
NX High Power AM/MW/LW
NX High Power AM/MW/LW
NX High Power AM/MW/LW
NX High Power: Typical Installation
NX High Power AM/MW/LW
NX High Power: Combined Installation
NX High Power AM/MW/LW
Nautel Dummy Loads
• Suitable for indoor or outdoor use
• Fully sealed and slanted top to
prevent water penetration
• Louvered front and back panels
• Rated for 50% above label power
• Frequency Range:
•530 – 1,700kHz operation
• VSWR: 1.05:1 maximum
• Available in many power levels
NX High Power AM/MW/LW
Nautel Specialized Integration
NX High Power AM/MW/LW
Nautel Support/Services
• Three support offices:
– Quincy, Bangor, Halifax
• Parts depots:
– Quincy, Bangor, Halifax, Memphis
– Memphis quick-ship depot
• Order by 7:30 EST for overnight delivery
• 24/7 live support
• Live chat
• Commitment
– Support for every Nautel product ever made…
no matter when it was manufactured.
NX High Power AM/MW/LW
NXSeries: Long Wave Band
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Frequency Range: 129 to 283.5
90%+ efficiency
135% positive peak modulation
1.5:1 VSWR
Other features are identical to
the NX MW models
NX High Power AM/MW/LW
Nautel Installed Transmitters
NX High Power AM/MW/LW
NX High Power AM/MW/LW
NX High Power AM/MW/LW
Nautel Installed Transmitters
NX High Power AM/MW/LW
Nautel Installed Transmitters
NX High Power AM/MW/LW
NX Series Summary
• The NX Series is the most advanced MW
transmitter series available today
• Available from 5kW to 2MW with unparalleled
efficiency
• Ready for all forms of digital radio
• Complete with powerful test equipment
• Nautel Continuous Improvement
NX5/10
NX25
NX50
NX100
NX200
NX High Power AM/MW/LW
NX300
NX400
NX800
Learn More / Stay in touch
• Nautel Waves Newsletter
http://www.nautel.com/newsletter/
• Webinars
http://www.nautel.com/webinars/
• YouTube
http://www.youtube.com/user/NautelLtd
• Nautel Store
http://store.nautel.com/
NX High Power AM/MW/LW
Questions? We’re ready to help.
Chuck Kelly
Director of Sales
Wendell Lonergan Head of Broadcast Sales
& Europe & Russia
Gary Manteuffel
US Corporate Accts & Canada
Ellis Terry
Western US
Jeff Welton
Central US
Gary Liebisch
Eastern US
Ken Ruzicka
Sales Engineer
John Abdnour
Asia / Pacific
Gerardo Vargas
Latin America / Caribbean
John Macdonald
Middle East / Africa
Christy White
VS and LPFM Specialist
Web: www.nautel.com Email: sales@nautel.com
NX High Power AM/MW/LW
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