DAR-4000H
DMB Digital On Channel Repeater
DAR-4000H is a DMB Digital On-Channel Repeater (DOCR) based on Eureka-147 DAB system for single frequency network. DARBS applies Maximal Ratio Combining (MRC), a multiple antenna receiving technique, to terrestrial repeaters for the first time in this industry to minimize MER degradation and to secure more stable DMB signal relay.
The DAR-4000H’s Adaptive Corrector function automatically compensates for linear and nonlinear distortion to maintain optimal signal quality.
DAR-4000H receives feedback on the transmission signal and measures and displays the quality of the transmission signal.
Function
Signal Measurement
- Measurement of transmission signal quality: MER, Frequency Response, etc.
Signal processing and calibration
- Adaptive pre-corrector: Compensation of linear and nonlinear pre-distortion
- Interference Cancellation System(ICS)
- Integrated exciter with demodulator
Remote Control
- Wireless remote control: Ethernet, CDMA
Specs
| Performance | |
| Output Power | Max 200W for Ensemble |
| System Gain | 115dB |
| RF Input Range | -70 ~ -15dBm Max |
| ICS Range | 30dBc |
| System Delay | 40µs Max |
| VSWR | 1.2 Max |
| Spectrum Mask | In critical mask (ETS300401) |
| Carrier Stability | < ±0.05ppm |
| In-band Flatness | 2dB(p-p) |
| In/Out Frequency Difference | 0Hz |
| Adjacent-channel Selectivity | 33dBc |
| MER Reduction Rate | < 0.1dB |
| General | |
| RF Input Level | VHF 7A ~ 13C |
| RF In/Output Impedance | 50Ω |
| Main Power Consumption | 1.2kW Max |
| Dimensions | 600 (W) X 2000 (H) x 900 (D) |
| Permissible Relative Air Humidity | 85% |
| Operating Temperature | -10 ~ +45℃ |
| Power Supply Voltage | AC 220V ±10%, 50/60Hz |
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