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

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SDB680 DMR Base Station

SDB680 DMR Base Station


  • General

    Frequency: AC (136-174 MHz), TU (400-480 MHz), UW (440-520 MHz)
    Power Supply: 13.9 V DC
    Frequency Stability: +/-0.5ppm
    Channel Spacing: 12.5kHz, 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)


    Storage Temperature: -40°C to +80°C
    Operating Temperature: -30°C to +60°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