SR 900 Series
902 - 928MHz
Spread Spectrum Radios
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Description
The SR 900 products are compact, low-cost radio modems utilizing frequency hopping spread spectrum technology. They are designed to provide economical, reliable data communications between a master and a single/or clustered remote sites. The 1Watt RF output SR 901 radio complements lower-gain omnidirectional antennas to reach a large number of remote sites from a master station. For remote sites, the 100 mW RF output SR 900 radio provides excellent range with higher-gain Yagi antennas while placing minimum demand on DC power sources. Extended temperature range versions of both radios, the SR 900ET and the SR 901ET, offer full performance operation from -40ºC to +75ºC.
Typical uses
An SR 900 radio network provides low-cost, two-way communication of monitoring and control information for SCADA, electronic flow measurement, leak detection, distribution automation, demand side management, water supply and quality measurement, and other applications where reliable wireless data communication is essential. The units also work directly with the Signalcrafters 5000 Series equipment to provide a complete radio telemetry solution. Their compact modular design allows the SR 900 products to be easily integrated into existing equipment enclosures.
Immediate economical network solutions
Applying for radio frequency licenses is expensive and time consuming, particularly if a license request is denied. The resulting network redesign will delay installation and add to startup costs. Operating license-free under FCC Part 15 rules, a SR 900 radio network avoids the front-end costs, risks, and delays of obtaining radio network licenses. Once installed, an SR 900 radio network quickly pays for itself by eliminating monthly user fees and other recurring costs associated with subscriber-based communications networks.
Flexible networking
SR 900 radios can be configured for point-to-point, point-to-multipoint, or peer-to-peer communications.
Reliable communications
SR 900 radio networks are 100% application-dedicated. This means no lost or delayed data due to poor line quality or busy subscriber networks. Forward error correction and built-in diagnostics further enhance SR 900 network reliability.
Seamless external network connection
SR 900 radio networks integrate easily with VSATs, leased phone lines and other communications networks for cost-effective data communications with a large number of remote locations. SR 900 products are fully RS-232 compatible and support continuous data rates up to 19200 bps.
Installs in existing equipment enclosures
The compact size of the SR 900 products allows them to share enclosures with remote terminal units or other types of remote telemetry equipment. Low power consumption, using highly efficient switching regulation, means the SR 900 products can be operated from solar panels or from existing power sources.
SR 900 Series Specifications:
Communications Network:
Architecture: Point-to-point, point-to-multipoint, peer-to-peer Radios per Network: Unlimited line of sight Maximum Message Size: Unlimited Data Interface:
Data Port: RS-232, surge protected. DTE or DCE without cable change.
Port Data Rates: 1200 to 19200 bps sustained Physical Connection: DB-25 female connector Flow Control: RTS/CTS or none RF Transceiver:
Frequency: 904-926 MHz, FCC Part 15.257 license-free Transceiver Type: Frequency hopping spread spectrum Modulation Rate: 37.5 kbps Number of RF channels: 440 Frequency Use: 6 selectable 3.2 MHz hopping bands. Hop bands may be offset up to 3.2 MHz in 50 kHz steps. Hopping patterns: 64 user selectable Error Correction: Reed-Solomon forward error correction Transmit Power: 100 mW (SR 900, SR 900ET) 1 Watt (SR 901, SR 901ET)
Maximum 4 Watts EIRP from antenna
Receive Sensitivity: -105 dBm for 10-6 BER Range: 12 to 22 miles typical RF Connector: Reverse pin type TNC Electrical and Environmental:
Operating Temperature: -40° C to +75° C (SR 900ET, 901ET) 0° C to 50° C (SR 900, 901)
Storage Temperature: -50°C to +85°C Humidity: 95% non-condensing Operating Voltage: 9 to 28 VDC surge protected. High efficiency switching regulation Typical Transmit Current and Power Consumption:
DC volts
SR 900/SR 900ET
SR 901/SR 901ET
9
85ma
0.77watt
470ma
4.23watts
12
68ma
0.82watt
315ma
3.78watts
24
43ma
1.03watts
152ma
3.65watts
28
39ma
1.09watts
132ma
3.70watts
Typical Receive Current and Power Consumption:
DC volts
SR 900/SR 900ET
SR 901/SR 901ET
9
50ma
0.45watt
50ma
0.45watt
12
49ma
0.59watt
49ma
0.59watt
24
32ma
0.77watt
32ma
0.77watt
28
30ma
0.84watt
30ma
0.84watt
Typical Standby Current and Power Consumption:
DC volts
SR 900/SR 900ET
SR 901/SR 901ET
9
28ma
0.25watt
28ma
0.25watt
12
27ma
0.32watt
27ma
0.32watt
24
16ma
0.38watt
16ma
0.38watt
28
14ma
0.39watt
14ma
0.39watt
Add 6ma per LED to above values if front panel display is enabled.
Physical:
Enclosure Size: 4.7"w x 5.1"d x 1.4" h Weight: 9.6 ounces (0.27 kg) Antenna Selections:
Omnidirectional: 3, 5, or 7 dBd ½ wave rubber (short range)
Yagi: 6, 9, or 11 dBd Diagnostics:
- RS-232 signal LEDs
- Power LED
- Receive signal strength indicator for antenna alignment
- Link MasterÔ packet test utility
Configuration Software:
Link Masterä configuration and diagnostic utility software. Windowsâ 3.1x, Windowsâ 95, Windowsâ 98, and Windows NTä compliant.
Windows and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in the U.S. and/or other countries
Accessories:
- Lightning protection
- AC power supplies
- Solar power supplies
- RF transmission cables
- Power/data cables
- Mounting kits
