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 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.

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.

Typical communication distances are greater than 4 miles with up to 60 miles achievable under ideal conditions. Extended communication distances are possible using repeaters. 

The operating frequency band of this radio modem may be shared with other non-licensed services such as cordless telephones and with licensed services including emergency broadcast and air-traffic control.

The RF451 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 other interference.

RF451 radios, like all FCC Part 15 devices, are not allowed to cause harmful interference to licensed radio communications and must accept any interference that they receive. Most Campbell Scientific users operate in open or remote locations where interference is unlikely. If there is a problem, interference can be reduced using methods such as moving the device, reorienting or using a different type of antenna, or adding RF shielding.

Powering the Radio

At least two radios are required to create a link. The radio may be powered through the dc barrel connector or via a CS I/O connection. When ac power is available, the 15966 wall charger is commonly used. At remote sites, the RF451 typically is powered through the CS I/O or the 14291 field cable.

Antennas

Campbell Scientific offers a variety of antennas for this radio. The 14204 is a 0 dBd, 1/2 wave omnidirectional whip antenna that connects directly to the radio (no cable required) and can transmit short distances (up to 1 mile). The 15970 dipole antenna includes adhesive for window or wall mounting and a cable for connecting to the radio.

Our higher gain 14221 omnidirectional and 14205 Yagi antennas require a cable to connect them to the radio. The 31314 surge protector is available for radios susceptible to lightning or electrostatic buildup or when the cable length needs to be longer than 3 m (10 ft), as measured between the transceiver and the antenna.

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

 

Power

Input Voltage 7 to 28 Vdc
Powered Over CS I/O or barrel plug
Connector Barrel plug, center positive 12 V (used to connect the 14291 Field Power Cable or 15966 ac adapter)

 

USB

-NOTE- Used for connection to computer for network communications or device configuration. Does not supply enough power for normal operation; RF451 must be powered through dc barrel plug or CS I/O.
Type USB standard B (device only)

 

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