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Technical Description

The RF450 consists of a radio module manufactured by FreeWave Technologies and a Campbell Scientific interface board. It reduces susceptibility to RF interference from other spread spectrum devices by providing user-selectable frequency hopping patterns.

Spread spectrum radios spread the normally narrowband information signal over a relatively wide band of frequencies. This process allows communications to be more immune to noise and interference from RF sources such as pagers and cellular phones.

RF450 Specifications

  • Operating Frequency: 902 to 928 MHz
  • Type: Frequency Hopping Spread Spectrum (FHSS) Transceiver
  • FCC ID: KNY-6231812519
  • Canada ID: 2329B-DGR09RAS
  • Power Output: 5 mW to 1 W, user selectable
  • Transmit Range: Maximum transmission distance of 60 miles, and realistic reliable transmission distance of ~13 miles. All transmission distances assume line-of-sight and appropriate antenna; line-of-sight obstructions, RF interference, and antenna type affect transmission distance.
  • Modulation: GFSK, 120 or 170 kbps
  • Occupied Bandwidth: 230 kHz at 60 dB
  • Channel Spacing: 230 kHz
  • Hopping Patterns: 15 per band, 105 total, user selectable
  • Hopping Channels: 50 to 112, user selectable
  • Hopping Bands: 7, user selectable
  • Frequency Zones: 16 zones, 7 channels per zone
  • Receiver Sensitivity:
    -108 dBm for 10-6 BER;
    -110 dBm for 10-4 BER
  • Receiver Selectivity:
    -20 dB at Fc ±115 kHz;
    -60 dB at Fc ±145 kHz
  • System Gain: 140 dB
  • Error Detection: 32-bit CRC, retransmit on error
  • Data Encryption: Substitution, dynamic key
  • Link Throughput: 115.2 kbps, maximum
  • Data Interface Protocol: CS I/O, RS-232, DCE, ME and SDC, user selectable
  • RS-232 Baud Rate: 1200, 4800, 9600, 19.2k, 34.4k, 57.6k, or 115.2k bps; user selectable
  • RS-232 Connector: 9-pin D Female
    (4 wire: Tx, Rx, CTS, GND)
  • CS I/O Connector: 9-pin D Malea
  • Antenna Connector: Type SMA female
  • Power Connector: Barrel plug, center positive 12 V; used to connect the 14291 Field Power Cable or 15966 AC adapter
  • Input Voltage: 7 to 28 Vdc
  • Operating Temperature: -40° to +75°C
  • Relative Humidity: 0 to 95% RH non-condensing
  • Dimensions without mounting plate:
    3.66 x 8.05 x 14.48 cm
    (1.44” x 3.17” x 5.70”)
  • Dimensions with mounting plate:
    3.66 x 8.05 x 19.05 cm
    (1.44” x 3.17” x 7.5”)
  • Weight: 0.3 kg (0.7 lb)

Average Current Drain @ 12 Vdc

  • Sleep: 7 mA
  • Idle: 22 mA
  • Receiving: 76 mA
  • Transmitting: 500 mA

a - Newer dataloggers provide power to the radio on the CS I/O connector; dataloggers purchased before December 1997 require the #14291 Field Power Cable.

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