SEL Mirrored Bit Radio, DGR-115RU
900 MHz Spread Spectrum Wireless Radios
 Radio and SEL
Designed and optimized for use with Schweitzer Engineering Laboratories Mirrored Bits™ communications protocol, the FreeWave Technologies DGR-115RU provides robust, reliable, error-free communications for electric power protective relay applications.
 
This product is ideal for point to point line of sight communications of 10 miles or less, and provides significant cost and time savings over the installation of a fiber optic link.
 
The DGR-115RU's unique, fast frequency hopping technology provides maximum availability. This ensures reliable Mirrored Bits communications, even in the presence of noise, interference, and high-level electrical fields found in electrical substations.
 
 Features:  
  • Mirrored bits protocol
  • High Speed - 115.2 Kbps continuous throughput
  • Error Free Communications - 32 bit CRC with automatic retransmission
  • Secure - Proprietary spread spectrum technology prevents detection and unauthorized access
  • Versatile - A single radio can operate simultaneously as a Slave and as a Repeater
  • High Noise Immunity - Superior Performance in noise congested environments
  • Industrial Grade Specifications - 100% tested for full performance from -40°C - +75°C
  • Rugged enclosure
  • Two operating voltages - 12 or 24 Vdc
Specifications
Radio link:
      Frequency Range 902-928 MHz
      Method Frequency hopping spread spectrum
      Hopping Patterns 15 user selectable
      Hopping Channels 50 to 112, user selectable
      Hopping bands 7, user selectable
      Range, Line-of-sight 10 miles
      Occupied Bandwidth 230 KHz
      Modulation GFSK, 120 ~ 170 Kbps
      RF Connector Type N female
Transmitter:
      Output Power <50 mw to 1 watt (+30 dBm)
Receiver:
      Sensitivity -108 dBm for 10-6 BER
      Selectivity 20 dB at fc ± 230 KHz
60 dB at fc ± 290 KHz
Data Transmission:
      Error Detection 32 bit CRC, retransmit on error
      Data Encryption Substitution, dynamic key
      Data Latency 2 ms typical
      Link Throughput** 115 Kbps max
** Uncompressed , measured assuming 75% frequency availability
Data Interface:
      Protocol RS-232/RS-422/RS485,
1200 Baud to 115.2 KBaud, DCE
      Connector DB9-female
Power Requirements:
      Voltage 9.5 to 14.5 Vdc or
15 to 32 Vdc
      Transmit Current 700 mA peak at 12 Vdc
      Receive Current 100 mA at 12 Vdc
      Idle Current 65 mA at 12 Vdc
Environment and mechanical:
      Operating tempertature -40 °C - +75 °C
      Enclosure Extruded Aluminum
      Dimensions 6.5 L x 2.93 W x 2.23 H ["]
165 L x 74.4 W x 56.6 H [mm]
      Weight 441 g / 15.5 oz
 
Ordering Info
Model Supply Voltage
DGR-115RU 9.5 to 14.5 Vdc
DGR-115RXU 15 to 32 Vdc