Radio Modem Products

RF DataTech manufactures a comprehensive range of radio modem products designed to meet demanding international standards.

They are ideal for point-to-point wireless data links or point-to-multipoint applications such as alarm systems, scanning telemetry or SCADA systems.

VHF (138MHz - 225MHz), UHF (406MHz - 512MHz) and 869MHz (868MHz - 870MHz) models are available with a choice of transmit powers.

The low power radios meet the licence-exempt ETSI EN 300-220 specification for use throughout Europe while the higher power 5W versions meet the tougher European EN 300-113 requirements and the equivalent USA (FCC) and Canadian (IC) specifications.

ZRT radio modem
  • 150bps, 300bps, 600bps, 1200bps, 2400bps, 4800bps or 9600bps over-air data rate in 12.5kHz RF channel
  • VHF, UHF & 869MHz versions available
  • RS232, 5V TTL or combined RS232/RS485/RS422 data interface options
  • FSK, FFSK, GMSK or 4FSK modulation automatically selected depending on data rate
  • Low power consumption
  • Forward Error Correction (FEC) selectable at 9k6 bps
  • Highly sensitive receiver
  • Supports "Store & Forward" repeater operation
  • Transparent mode supports any protocol
  • Additional configurable options for MODBUS & HAYES protocols
  • Easy configuration using PC software
 

The over-air data rate can be set to a range of values between 150bps and 9600bps in a 12.5kHz channel and there is an internal buffer to cope with situations where the serial interface baud rate is set higher than the selected over-air rate. If high speeds are not required, the modem can be programmed to a slower over-air rate to take advantage of the associated improvement in receiver threshold.

At lower data speeds (1200bps and below) the radios can be configured to use either Bell 202 or V.23 tone sets for compatibility with existing equipment.

Careful attention to intermodulation performance, spurious response, adjacent channel and blocking performance, makes the product ideal for crowded telemetry radio channels.

Our Windows based configuration software WinA4P allows all the radio settings to be programmed by the user.

The table below shows our most popular modems:-

Model Bands Tx Power
Ranges
RF
Configs
Interfaces Key Features
ZRT Series
ZRT radio modem
VHF

UHF
10mW-750mW

100mW-5Watt
Half-Duplex

Simplex
RS232

RS485

RS422

3.6V/5V TTL
Low cost

Compact size

Panel mount

FCC Approved

Industry Canada Approved
ART Series
ART radio modem
UHF 10mW-750mW

50mW-5Watt
Full-Duplex

Half-Duplex

Simplex
RS232

5V TTL

600 ohm audio
(4W-balanced)
Dual Synthesizer for extra fast key-up

Auxiliary digital inputs and outputs

DIN Rail Mount

FCC Approved

Industry Canada Approved
XRT Base-Station Series
XRT base-station
UHF 50mW-5Watt

500mW-10Watt
Full-Duplex

Half-Duplex

Simplex
RS232

600 ohm audio
(4w-balanced)
Works with ZRT, SRT, URT & ART Modems

Dual Synthesizer

Duplicated configurations possible using two XRT radio shelves and matching XRT9000X baychanger shelf.

19" Rack Mount