SDB680 DMR Base Station

The SDB680 DMR base station delivers 6.25 kHz equivalent digital communications at 50 Watt transmit power with 100% transmit duty cycle. Exploiting Simoco’s experience in radio infrastructure, SDB680 can be interconnected over an IP backhaul to form wide area radio systems without any additional or centralised switching components.


  • Full standards compliance ensures terminal supplier choice and avoids proprietary lock-in
  • 50 Watt Transmit Power mitigates combiner losses and provides a like-for-like replacement when migrating to digital
  • Continuous Duty cycle at full power for Tier III trunked radio systems and high availability Tier II radio networks
  • Automatic analogue/DMR Tier II switching for seamless digital migration
Frequency Bands: VHF:136–174MHz
Power Supply: 14.1 V DC
Frequency Stability: +/-0.5ppm
Channel Bandwidth: 12.5/25kHz
Channel Capacity: 2000
Dimensions: 408 mm (width) x 425 mm (deep) x 88.9 mm (height) (19” rack mount)
Weight: 8.95 kg
Emission Masks: 7K60FXD (data), 7K60FXE (voice), 7K60F1W (voice and data) for 4FSK digital modulation, 11K0F3E for 12.5 kHz modulation
RF Output Power: 50 W
Modulation Limiting: +/-2.5 @ 12.5kHz, +/-5.0 kHz @ 25kHz
FM Hum and Noise: -40dB (TIA-603-B)
Conducted / Radiated Emission: Complies with ETS086-1 / ASNZS4295 / TIA603-B
Adjacent Channel Power: -60dBc (ETS086-1)
Spurious emissions: -80 dBc
Audio Response: +1/-3dB
Audio Distortion: 3% (TIA-603-B)
Digital Vocoder Type: AMBE+2
Analogue Sensitivity: -117.5dBm (12dB SINAD)
Digital Sensitivity: -117.5dBm (BER 1%)
Intermodulation: 70dB (ETS086-1)
Adjacent Channel Selectivity: 65dB (ETS086-1)
Spurious Rejection: 70dB (ETS086-1)
Hum and Noise: -40dB (TIA603-B)
Audio Response: +1/-2dB (0.3-2.55kHz)
Audio Distortion: 3% @ 4W
Conducted Spurious Emission: -57dBm (ETS086-1)
Operating Temperature: -30°C to +60°C
Storage Temperature: -40°C to +80°C
  • Fully compliant with ETSI DMR standards
  • Software upgradeable from Tier II to Tier III operation
  • 5 - 50 Watt Transmit Power
  • 100% duty cycle
  • Forward power and VSWR Monitor
  • Suite of Management Software for configuration and maintenance
  • Analogue and Digital (DMR Tier II) conventional modes
  • Intelligent Base-Station for DMR Tier III Trunking with no additional switch/controller equipment
  • Software only expansion options to full trunking