DMR Digital Smart Single Frequency Repeaters

Digital Mobile Radio (DMR) is a digital radio standard specified for professional mobile radio (PMR) users developed by the European Telecommunications Standards Institute (ETSI), and first ratified in 2005.

DMR operates within the existing 12.5kHz channel spacing used in licensed land mobile frequency bands globally and meets future regulatory requirements for 6.25kHz channel equivalence. The DMR protocol covers unlicensed (Tier I), licensed conventional (Tier II) and licensed trunked (Tier III) modes of operation, although in practice commercial application is today focused on the Tier II and III licensed categories.

Keeping your team connected requires uninterrupted radio coverage. But often, network dead zones and remote locations present barriers to seamless communication.

Unlike traditional repeaters, A HELIOS® SFR700 series DMR Single Frequency Repeater (SFR) is based on SDR (Software Define Radio) technology with IP65-rated for dust and water protection, so you can fast deploy it on campuses, in parking garages and across other outdoor locations. The compact size gives you more installation options, such as mounting on walls or poles. Using interference cancellation technique, HELIOS® DMR Single Frequency Repeater (SFR) allocates one timeslot to receive a signal and the other to transmit it on the same frequency. In this way, it’s unique SFR feature enabled will repeat the traffic on slot 2 received on slot 1 without antenna isolation limits upon deployment on site, which help customers to save frequency resource, centralized controller or expensive license.

Coverage without complications

Whether you want to eliminate dead zones or expand coverage to remote locations, count on the HELIOS® SFR700. Compact, easy to install, and designed to work indoors or out, it’s built to grow as your needs do.

Keeping your team connected requires uninterrupted radio coverage. Using the HELIOS® SFR700 series DMR Single Frequency Repeater (SFR), you can easily extend the range of your network through dead zones and across remote locations, so everyone’s within reach. Deploy the HELIOS® SFR700 indoors or out—it’s IP65-rated for dust and water protection. The compact size gives you more installation options. And a low power, fanless design uses less space and energy.

Protected Your Environment

Improve your coverage in the way that works best for you. With an IP65 rating for water and dust protection, along with a fanless design, you can deploy indoors or out without worry.

Deploy In More Places

Easily mount the HELIOS® SFR700 on walls or poles, and take advantage of additional locations to improve coverage. And its compact, fanless design means fewer HVAC planning headaches—with more deployment options.

Cost-Effective Coverage

Increasing your coverage doesn’t have to mean increasing your cost of ownership. The HELIOS® SFR700 features single frequency, fanless, space-saving design that reduces energy and potential installation costs, and expand your range without having to purchase additional frequencies.

  • Indoor Outdoor Compatible
  • IP 65 enclosure for Wall or Pole Mounting
  • Low Noise, Fan-less design
  • Single Frequency with TDMA operation
  • Reduced total cost of ownership
  • Software Define Radio Technique
  • Support repeating voice and data of DMR Tier II & III
  • Saving Frequency Resources
  • Ease of installation
  • Expandable

Electrical Specification

Frequency Bands: VHF 136-174MHz, UHF 400-527MHz

Channel Spacing: 25KHz

Frequency Stability: 0.5ppm

Channel Capacity: Min. 4 Channels (1 Channel active + 3 idle Channels)

Operation Mode: Single Frequency with TDMA operation

DFS (FCC & ETSI): Support

System Gain: 95dB (+/-3)

Output Power per Band: +33dBm, +37dBm, +40dBm for options (+/-1dB)

Ripple in Band: Max 2dB

AGC Control Range: Max 40dB

Gain Control Range: 31dB (1dB Step)

ALC Adjustment Range: Min. 20dB

RF Input Dynamic Range: -108dBm to -20dBm

Noise Figure: Max 5dB

Group Time Delay: Max 30mS

In-band Inter Modulation Attenuation: Comply to ETSI Requirement

Approvals and Tests: ETSI 300 086, ETSI 300 113, ETSI TS 102 361-1, -2, -3 (DMR Tier II and III)

Alarm Function: Real-time alarm for Door Status, Temperature, Power Supply, VSWR, Output Power, Gain, Uplink ATT, Downlink ATT, Channel Switch and etc.

SNMP Function: SNMP V3 and MIB File

External and  Connection

RF Connector: N-type Female

Local Control: RJ-45

Mechanical Specification

Temperature Range: -25 degree Celsius to +55 degree Celsius

Relative Humidity: Max 95%

IP Protection: IP67

Dimension: TBD

Weight: TBD