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SR 900 Series
902 - 928MHz
Spread Spectrum Radios

 

  • License-free operation
  • No recurring subscriber network costs
  • Point-to-point
  • Point-to-multipoint
  • Peer-to-peer
  • Full RS-232 compatibility
  • 1200 to 19200 bps data rates
  • Forward error correction
  • Protocol transparent
  • Low power consumption
  • Compact design
  • Rugged design handles hazardous or extreme
    operating environments
  • 1W or 100mW Transmit Power
    (1W SR901 / 100mW SR900)

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 -40C to +75C.

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: -50C to +85C
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

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 Master packet test utility

Configuration Software:

Link Master configuration and diagnostic utility software. Windows 3.1x, Windows 95, Windows 98, and Windows NT 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