RF451 RF451-1 RF451-2 RF451-3 RF451-4
RF451 RF451-1 RF451-2 RF451-3 RF451-4

RF451 900 MHz 1 W Spread-Spectrum Radio

The RF451 is a frequency-hopping spread-spectrum radio, capable of operating between 902 to 928 MHz and transmitting with up to 1 Watt (30 dBm). The specific frequencies used may be selected when operating outside the US and Canada to meet local regulations. Additionally, the RF power output may be adjusted to as low as 10 mW via software.
Environment | Communications | Campbell Scientific
  • The RF451 is a powerful 900 MHz point-to-multipoint serial radio that is well suited for wireless networking with PakBus data loggers that are located miles apart.
  • The RF451 is a 902 to 928 MHz frequency-hopping spread-spectrum radio.
  • The radio features high noise immunity, fast serial data transfer speeds, and the maximum transmit power allowed by the FCC in an effort to provide reliable, hassle-free operation.
  • Constructing a network using RF451 radios is a simple, easy-to-do configuration process.
  • To construct a network, connect one radio to a PC and configure it as the master radio.
  • Then connect a second radio to a data logger. The link can be treated as a high-speed, multi-drop serial connection.
  • Does not require individual operational license in several regions around the world
  • Long-distance, high-speed, serial communication with battery-operated stations
  • Each radio capable of performing master, remote, or repeater role
  • Remote diagnostics and setup possible with diagnostics cable and software
  • Compatible with existing RF450 and FreeWave FGR radio networks
Radio Type Frequency Hopping Spread Spectrum (FHSS)
Frequency 902 to 928 MHz
Country Used In US, Canada, Australia
Power Output 10 to 1,000 mW (user-selectable)
Transmission Distance
  • -Note- Transmission distance assumes line-of-sight and appropriate antenna. Line-of-sight obstructions, RF interference, and antenna type will affect transmission distance.
  • 20.92 to 96.56 km (13 to 60 mi) depending on antenna and line-of-sight
Modulation 2 level GFSK
RF Data Rate 115.2 or 153.6 kbps (selectable speeds)
Occupied Bandwidth 142 kHz (applicable to FCC ID KNYAMM0921TT)
Hopping Patterns 15 per band, 105 total (user-selectable)
Hopping Channels 50 to 111 (user-selectable) applicable to FCC ID KNYAMM0921TT
Frequency Zones 16
Receiver Sensitivity
  • -108 dBm at 115.2 kbps (for 10-4 BER)
  • -103 dBm at 153.6 kbps (for 10-4 BER)
IF Selectivity 40 dB (at fc ± 230 kHz)
Receiver Selectivity 50 dB (at 896 MHz, 935 MHz)
Error Detection 32-bit CRC (retransmit on error)
Data Encryption proprietary spread-spectrum technology
Link Throughput 115.2 kbps (maximum)
RF Connector Reverse Polarity SMA (RPSMA) jack (external antenna required)
CS I/O DB9 M, SDC 7/8/10/11 device
RS-232 DB9 F, DCE
Operating Temperature Range -40° to +85°C
Relative Humidity 0 to 95% RH (non-condensing)
Compliance Information
  • KNYAMM0921TT (FCC ID)
  • 2329B-AMM0921TT (Industry Canada ([IC])
Average Current Drain (@ 12 Vdc)
  • 650 mA (transmit)
  • 40 mA (receive)
  • 15 mA (idle)
  • 6 mA (sleep)
Communication Ports
  • RS-232 9 pin D female
  • CS I/O 9 pin D male
  • USB Type B jack
Service Requirements Shares frequency with other devices. Must not cause harmful interference to licensed radios. Requires line-of-sight.
Dimensions 13.61 x 2.74 x 7.01 cm (5.36 x 1.08 x 2.76 in.)
Weight 0.18 kg (0.4 lb)