RF322 UHF Radio Transceiver
Rugged, Long Range
Long-distance option for communication
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications


The RF322 is a 411 to 429 MHz radio. Campbell Scientific’s RF320-series narrowband UHF/VHF radio transceivers provide a long-distance telemetry option for communicating with remote measurement stations. Each radio includes a configured Ritron DTX-L radio, a mounting bracket, and a cable for connecting the radio to a radio modem. The different models vary by the frequency ranges they support.

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RF320-series radio transceiver connected to a PC

Detailed Description

The RF322 is programmed by Campbell Scientific to the frequency that was assigned by the Federal Communications Commission (FCC). This frequency must be specified at time of order so that it can be programmed into the radio.

A user-supplied antenna is required for each radio; contact Campbell Scientific for more information about selecting the antenna and cable. Each radio must also be connected to an RF500M or RF310M radio modem.


Ritron Module DTX-445
Industry Canada ID 1084A-RIT17445
FCC Rule Parts 90
Industry Canada Rule Parts RSS-119
Frequency Range 411 to 429 MHz
RF Channels 8 independent Tx/Rx frequencies
Synthesizer Step 6.25 kHz
Channel Spacing 12.5 kHz
Frequency Stability ±1.5 PPM (-30° to +60°C)
Input Voltage 9 to 17 Vdc
Antenna Connector BNC female
Dimensions 14.5 x 7.6 x 3.5 cm (5.7 x 3 x 1.375 in.)
Weight 0.2 kg (7.3 oz)

Current Drain @ 12.5 Vdc

Receive Standby 25 mA
  • < 0.9 A (2 W output)
  • < 1.2 A (5 W output)


Receiver Type 12.5 kHz narrowband
Sensitivity 0.25 μV (12 dB SINAD)
Adjacent Channel -60 dB
Receiver Attack Time < 10 ms (Tx to Rx)
Noise Squelch Sensitivity PC adjustable (factory set for -121 dBm)


RF Power Output 2 W or 5 W (@ 12.5 Vdc)
Duty Cycle 50% (< 13.5 V, 5 W output, 25°C)
Voice Emissions Designator 10K0F3E
Data Emissions Designator 9K8F1D, 11K0F2D, 11K0F3D
Transmitter Attack Time < 10 ms


Radio Modems

RF500M RF310M RF95A RF95 RF95T RF315M

Radio Base Stations

RF500B RF310B RF232A RF232 RF232T


The RF322 is compatible with the RF313 radio.

Datalogger Considerations

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X

Compatible Retired Dataloggers

CR500 CR510 CR10 CR10X 21X CR23X CR9000 CR5000 CR7X

Note: The CR200(X)-series dataloggers are only compatible if the RF500M radio modem is used.

Frequently Asked Questions

Number of FAQs related to RF322: 2

  1. No. The RF500M cannot be directly interfaced with a GPS receiver. However, most Campbell Scientific dataloggers can be interfaced with the output from a GPS receiver and programmed to extract the positional information. This information can then be accessed via an RF500M/RF320 RF link.
  2. It is possible to connect two antennas to a single radio via a properly specified (operating frequency and power handling capability) two-way, 50 ohm RF power divider. One example of this type of power divider is offered by Pasternack. Note that using a device like this will induce additional losses into the system (3 to 4 dB, typically).