900
MHz Spread Spectrum Wireless Radios
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:
| 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 |