Campbell RF450, Instruction Manual

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RF450 Spread Spectrum Radio
1. General Description
The RF450 Spread Spectrum Radio is a 900 MHz license-free radio
specifically designed to work with Campbell Scientific dataloggers. RF450
radios consist of a FreeWave DGR09 radio module and an interface board.
This manual addresses the RF450’s interface with CR3000, CR1000, and
CR800-series dataloggers and a PC running
LoggerNet
. Though the radios
may be setup in a point-to-point mode, this manual will only address multi-
point applications, as this is the only way to take advantage of the low-power
mode of the Slave radios at the datalogger site. This reduces the required
power at remote sites from about 75 mA to less than 10 mA in most
applications.
2. Cautionary Statements
IMPORTANT — Radios must be configured to use the proper hop table
version to comply with local laws and to avoid interference with other RF
installations such as cellular services. Available hop table versions are listed in
the Device Configuration Utility
Settings Editor
for the RF450. Hop table
versions include North America (default), Australia , New Zealand , Taiwan ,
Brazil , International , and Notch (custom). See Appendix B , Settings Editor
(p. B-1)
, for more information.
3. Specifications
Frequency: 902 to 928 Mhz
Transmit:
Output Power 5 mW to 1 W, user selectable
Range 60 miles maximum assuming ideal conditions,
line-of-sight, and appropriate antenna. Note
that line-of-sight obstructions, RF interference,
and antenna type will affect transmission
distance. Realistic, reliable distances are
approximately 13 miles.
Modulation Spread spectrum GFSK, 120 or 170 kbps
Spreading Method Frequency hopping
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
Receive:
Sensitivity -108 dBm for 10-6 bit error rate
-110 dBm for 10-4 bit error rate
Selectivity -20 dB at Fc +/- 115 kHz
-60 dB at Fc +/- 145 kHz
System Gain 140 dB
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