NGA-201F DRM-FM Modulator
The Newglee NGA-201F DRM Modulator is an embedded DRM baseband processor with built-in channel coding and OFDM modulation. It accepts MDI/DCP streams from the DRM multiplexer to generate RF signals compliant with ETSI ES 201 980. Its integrated PAPR reduction lowers the peak-to-average power ratio, improving transmitter output power and efficiency. Windowing and filtering algorithms ensure that the output spectrum meets the ITU-R requirements for DRM broadcasting.
- DRM modulator for the FM band.
- Adaptive linear and non-linear precorrection.
- Reliable and robust long-term operation.
DRM Mode E Modulation
- Performs DRM Mode E modulation of the MDI/DCP stream, providing high-quality, DRM-compliant RF output.
High-Performance Digital Signal Processing
- Integrates digital predistortion (DPD), adaptive linear and non-linear precorrection, and PAPR (peak-to-average power ratio) reduction, significantly improving system performance and transmission efficiency.
Direct Digital Synthesis (DDS)
- Employs near-RF direct digital frequency synthesis for higher signal fidelity and stability.
- Highlights
- Specifications
- Documentation
The Newglee NGA-201F DRM Modulator is a core device for DRM baseband processing built on an embedded platform. Equipped with channel coding and OFDM modulation, it accepts MDI/DCP streams from the DRM encoding multiplexer to generate RF signals compliant with ETSI ES 201 980. Its integrated peak-to-average power ratio (PAPR) reduction effectively lowers the PAPR of the OFDM signal, improving transmitter output capability and efficiency. It also provides spectrum-shaping capabilities, with built-in windowing and filtering algorithms to ensure the output spectrum meets the ITU-R requirements for DRM broadcasting.
Key Features:
- DRM Mode E modulation via MDI/DCP stream
- High-performance digital signal processing algorithms
- Direct digital synthesis to bring the signal as close to the RF domain as possible
- High-performance DSP and digital predistortion (DPD) for exceptional system performance
- Adaptive linear and non-linear precorrection with PAPR reduction
- RF output with digital-to-analog conversion
- Industrial-grade 19-inch 1U rack-mount unit
- Network and RS232 monitoring interfaces for real-time system status monitoring and management
- Firmware upgrades over the network, supporting remote and unattended operation
- GPS-based synchronization for SFN/MFN operation
- Reliable, robust long-term operation in all modes, without interruption or delay
- Spectrum shaping through advanced windowing and filtering algorithms
- Proven system reliability and stability in continuous operation
With its cutting-edge digital architecture, the Newglee NGA-201F DRM Modulator ensures high signal quality and operational efficiency, providing a comprehensive solution for modern digital broadcasting systems.
| Item | Parameter |
|---|---|
| Multiplex Stream Input | MDI/DCP multiplex stream input via IP network |
| Modulation Parameters | Spectrum mode: E |
| Bandwidth: 100 kHz | |
| Interleaving depth: 600 ms | |
| Constellation mapping: 4QAM, 16QAM | |
| Error correction: Convolutional coding, all code rates within the standard | |
| Protection: EEP, UEP | |
| RF Output | Center frequency range: 87 MHz – 108 MHz, adjustable in 1 kHz steps |
| RF output power: 20.0 dBm to 0.0 dBm | |
| Power accuracy: ±0.2 dB (within 24 hours) | |
| Frequency accuracy: 1×10⁻⁷ (internal reference), 1×10⁻⁸ (external 10 MHz reference) | |
| MER (Modulation Error Ratio): > 50 dB | |
| ACPR (Adjacent Channel Power Ratio): < 60 dBc | |
| Spurious emissions: | |
| < 90 dBc/Hz @ 10 Hz | |
| < 110 dBc/Hz @ 100 Hz | |
| < 120 dBc/Hz @ 1 kHz | |
| < 120 dBc/Hz @ 10 kHz | |
| < 125 dBc/Hz @ 100 kHz | |
| < 135 dBc/Hz @ 1 MHz | |
| Reference Clock (Internal) | Stability (internal): ±0.01 ppm |
| Aging rate: ±0.3 ppm/year | |
| Reference Clock (External 10 MHz) | Input level: AC-coupled, VPP ≥ 300 mV |
| Input connector: BNC-K (female), 50 Ω input impedance | |
| Control Modes | Local control: Six-button front panel, 40×2-character backlit English LCD, status indicators |
| Remote control: Web interface, RS232/RS485, network monitoring, remote upgrade support | |
| Monitoring Alarms | RF local oscillator unlock |
| Over-temperature |
Interfaces
| Interface | Description |
|---|---|
| RF OUT | RF signal output, N-K (female), 50 Ω output impedance |
| 1PPS IN | 1 PPS input, BNC-K (female), 50 Ω input impedance |
| 10M IN | 10 MHz clock input, BNC-K (female), 50 Ω input impedance |
| 1PPS OUT | 1 PPS output, BNC-K (female), 50 Ω output impedance |
| 10M OUT | 10 MHz clock output, BNC-K (female), 50 Ω impedance |
| RF IN | Precorrection signal input from the RF filter connected to the transmitter, BNC-K (female), 50 Ω input impedance, input level +5 to +10 dBm |
| RS232 (Remote Control/Monitoring) | Remote control and monitoring interface, RS232, DB9 (female) |
| RS485 (Remote Control/Monitoring) | Remote control and monitoring interface, RS485, DB9 (female) |
| NMS (Network Port) | Management network port for the web interface |