Summary
Summary
The industry’s first low‑power AM transmitters designed for digital transmission – now available in 1 kW and 2.5 kW rack‑mount models.
NX1 and NX2.5 are true extensions of Nautel’s proven NX Series, bringing the same ultra‑linear modulation architecture, digital transmission, and operational reliability used in high‑power NX installations worldwide to 1 kW and 2.5 kW transmitters.
These are not scaled‑down designs or entry‑level compromises. Compact and rack-mountable, they are purpose‑built NX transmitters that deliver flagship‑class performance at power levels where this capability has never been available before.
Proven NX Heritage
Over 40 megawatts of NX AM power deployed worldwide — five generations of design and tens of millions of operating hours behind every NX platform. NX1 and NX2.5 bring that NX‑class performance to low‑power broadcasters.
Designed for Digital
NX1 and NX2.5 are the industry’s first low‑power AM transmitters specifically designed to support digital transmission. Advanced digital modulation, ultra‑linear design and digital precorrection are built in for outstanding compatibility with modern digital AM standards.
Features
Features
- Compact, rack‑mountable low‑power NX transmitters
- Built‑in digital precorrection and ultra‑linear design
- All-Digital AM (MA3) and DRM configurations
- Award‑winning HTML‑based AUI
- Front‑accessible, hot‑pluggable RF modules
- Titanium‑grade, 96%‑efficient switching power supplies
- Single‑phase AC input (185–264 Vac)
- Module‑level monitoring, detailed metering and alarms
Technical Specification
Technical Specification
Efficiency
79% efficiency at rated power typical for NX2.5
78% efficiency at rated power typical for NX1
Modulation Capability
135% positive peak modulation at rated power
VSWR
1.5:1 VSWR threshold at rated power, 100% modulation
Frequency
530kHz – 1701 kHz
Transmission modes
Analog (Mono L, Mono L+R, Stereo), IBOC, DRM
Dimensions
NX2.5 75.6 cm H x 48.3 cm W x 58.4 cm D
(29.75”/17 RU H x 19” W x 23” D)
NX1 53.3 cm H x 48.3 cm W x 58.4 cm D
(21”/12 RU H x 19” W x 23” D)
RF output power (rated/max)
NX2.5 2.5 kW/2.75 kW
NX1 1 kW/1.1kW
Voltage
185-264Vac, 1 phase, 47 Hz to 63 Hz
Weight
• NX1: 77lbs (all components installed)
54lbs (power modules & power modules & power
supply/filtering components removed)
• NX2.5: 125lbs (all components installed)
75lbs (power modules & B+ power supply/filtering
components removed)
Power Factor
• NX2.5/NX1 – 0.95
RF output connection
7/8” EIA for NX2.5 and Type-N for NX1
RF power modules each with:
• Digital optimized linear design
• Integrated RF amplifier/modulator
• Microcontroller for protection and monitoring
• Short circuit protection
• Hot pluggable
Advanced exciters and modulation encoders:
• Digital precorrection
• MDCL/Dynamic carrier control algorithms
• Integrated AM stereo
• Audio filter with pre-emphasis and low pass
• Automatic changeover (with optional dual exciter
configuration)
Control and monitoring
• Local LCD Display
• HTML based remote access/control
• Contact closure remote interface
• Module level monitoring
• Power, current, voltage, RF spectrum, RF impedance,
modulation, heat sink temperature, fan RPM
