SDB680 DMR Base Station Repeater 136 – 174 MHz AC Band 50 Watt DC Powered (14V) 12.5 / 25 kHz Channel Spacing Includes DC Power Connector


Digital voice and data capabilities
IP distributed architecture
DMR Tier II conventional and Tier III trunked


The SDB680 DMR base station delivers 6.25 kHz equivalent digital communications at 50 Watt transmit power with a 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 BandsVHF: 136–174MHz
UHF: 400–480MHz
UHF: 440–520MHz
Power Supply14.1 V DC
Frequency Stability+/-0.5ppm
Channel Bandwidth12.5/25kHz
Channel Capacity2000
Dimensions408 mm (width) x 425 mm (deep) x 88.9 mm (height) (19” rack mount)
Weight8.95 kg
Emission Masks7K60FXD (data), 7K60FXE (voice), 7K60F1W (voice and data) for 4FSK digital modulation, 11K0F3E for 12.5 kHz modulation
RF Output Power50 W
Modulation Limiting+/-2.5 @ 12.5kHz, +/-5.0 kHz @ 25kHz
FM Hum and Noise-40dB (TIA-603-B)
Conducted / Radiated EmissionComplies with ETS086-1 / ASNZS4295 / TIA603-B
Adjacent Channel Power-60dBc (ETS086-1)
Spurious emissions-80 dBc
Audio Response+1/-3dB
Audio Distortion3% (TIA-603-B)
Digital Vocoder TypeAMBE+2
Analogue Sensitivity-117.5dBm (12dB SINAD)
Digital Sensitivity-117.5dBm (BER 1%)
Intermodulation70dB (ETS086-1)
Adjacent Channel Selectivity65dB (ETS086-1)
Spurious Rejection70dB (ETS086-1)
Hum and Noise-40dB (TIA603-B)
Audio Response+1/-2dB (0.3-2.55kHz)
Audio Distortion3% @ 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
  • A 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

Additional information

Weight 3 kg