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 Retired Products

RF310 VHF Radio Transceiver

The RF310 is a rugged, narrowband VHF radio transceiver for customers with an FCC-assigned frequency in the range of 148 to 174 MHz. It is...

RF312 UHF Radio Transceiver

The RF312 is a rugged, narrowband UHF radio transceiver for customers with an FCC-assigned frequency in the range of 440 to 480 MHz. It is...

RF313 UHF Radio Transceiver

The RF313 is a rugged, narrowband UHF radio transceiver for customers with an FCC-assigned frequency in the range of 400 to 440 MHz. It is...

RF310M RF Modem

The RF310M functions as the communication interface between a datalogger and an RF310, RF312, or RF313 radio. Extended temperature testing is available for extreme environments.  

RF310B RF Base Station

The RF310B is an RF modem used with our RF310, RF312, and RF313 narrow-band radios that usually resides at the computer site and serves as...

RF315M RF Modem

The RF315M provides the communication interface between a datalogger and a 3400 series Dataradio transceiver.

RF300 VHF Radio Transceiver

The RF300 is a DRL VHF radio transceiver for customers who will have an FCC-assigned frequency in the range of 150 to 174 MHz. It's...

RF301 VHF Radio Transceiver

The RF301 is a DRL VHF radio transceiver for customers who will have an FCC-assigned frequency in the range of 132 to 150 MHz. It's...

RF303 UHF Radio Transceiver

The RF303 is a DRL UHF radio transceiver for customers who will have an FCC-assigned frequency in the range of 403 to 419 MHz. It's...

RF304 UHF Radio Transceiver

The RF304 is a DRL UHF radio transceiver that is programmed to an exact user-specified frequency by Campbell Scientific using special software.

RF232A RF Base Station

The RF232A serves as a link to field stations and repeaters at the base station for RF300-series radios.  The RF232A includes a 110/220 Vac-to-12 Vdc...

RF200 5-Watt UHF Transceiver

This E.F. Johnson, UHF, half-duplex transceiver supported the 403-430, 430-450, 450-470, or 470-512 frequencies. The RF200 required an FCC frequency assignment and a frequency-matched antenna...

RF232T RF Modem

This modem was the same as the RF232, except it contained a PROM that increased the data collection rate by allowing the modem to collect...

RF100 4-Watt VHF Transceiver

This retired E.F. Johnson, VHF, half-duplex transceiver supported the 132-142,142-150, 150-162, 162-174 frequencies. The RF100 required an FCC frequency assignment and a frequency-matched antenna and...

RF232 RF Base Station

The RF232 was replaced by the RF232A, which is also retired. It was located at the base station computer and served as a link to...

RF95 RF Modem for Radio Telemetry

The RF95 was replaced in all applications by the RF95A or RF95T. The RF95 modem provided an RF communication interface between the datalogger and a...

RF95T RF95T RF Modem, Table Version

The RF95T was similar to the RF95 Modem except it contained more RAM and a different PROM that increased the data collection rate. The RF95T...

P50 UHF 5-Watt UHF Transceiver

The P50 UHF (4-Watt) transceiver was retired in June 1995; some replacement parts remain available (see Ordering Info). This UHF radio covered the 450 to...

P50 VHF 5-Watt VHF Transceiver

The P50 VHF (5-Watt) transceiver was retired in June 1995; some replacement parts remain available (see Ordering Info). This VHF radio covered the 150 to...

DC95 RF Modem

The DC95 was replaced by the RF95. This RF modem provided an RF link between a computer and Campbell Scientific datalogger. It was used with...

PS232 RF Base Station

This older version of the RF232 had a DC95 modem. The PS232 was located at the base station computer and served as a link to...

HT90 UHF 4W Radio

This radio was part of the SDC RF Series, an obsolete form of RF telemetry. Communication protocols were divided between the CR10 and an SDC...

HT90 VHF 4 W Radio

This radio was part of  the SDC RF Series, an obsolete form of RF telemetry. Communication protocols were divided between the CR10 and an SDC...

SDC RF HT90/CR10 Protocol

This obsolete form of RF telemetry divided the communication protocols between the CR10 and an SDC interface (connected to the back of HT90 radios). There...

FAQs

Can more than one antenna be connected to a single radio?

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).

Resources and Links

About UHF / VHF Radios

Campbell Scientific's narrow-band RF systems consist of a radio modem and a low-powered transceiver at the remote station(s), and a transceiver connected to a modem or base station at the computer site. Up to 254 stations can be interrogated over a single UHF or VHF frequency. Stations with compatible radio and radio modem can serve as repeaters to extend the line-of-sight transmission of the base station. Transmission distance is typically up to 25 miles between stations (line-of-sight).

An FCC-approved frequency assignment is required before radios and antennas can be ordered. Within a typical RF telemetry network, field sites use a directional "Yagi" antenna, repeater sites use omnidirectional antennas, and the base station may use either an omnidirectional or Yagi antenna depending on the geographic distribution of the network.

A typical field station contains a datalogger and is located at the measurement site. Repeater stations act as a communication relay between stations that cannot communicate due to distance or obstacles. A repeater station can be upgraded to a field station with the addition of a datalogger and sensors.

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