Campbell Scientific RF450 Spread Spectrum Radio - Manual (Page 7)

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.
Radios deployed outside of the United States must use a Hop
Table Version other than zero (the default). See Appendix B for
details on changing the Hop Table Version. NOTE
to International users
2. 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
Data Transmission:
Error Detection 32 bit CRC, retransmit on error
Data Encryption Substitution, dynamic key
Link Throughput 115.2 kbps, max
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