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BL118 data sheet - .PDF file.

Radiometrix has introduced the BL118 bidirectional control device, which uses a half-duplex radio transceiver to establish a two-way wireless link for remote-control applications including security and fire-alarm systems, radio-frequency remote-control systems, industrial controls and long-range telecontrol with narrow-band FM radios.

The radio link operates continuously, providing a valid communication link indication.

The BL118 board is used in pairs: a master/initiator and a slave/responder. The relays are activated when the state of the input on one board changes and vice-versa.

The basic BL118 has a single logic input (diode protected, with pull-up) and an 8A 240V mains-rated SPCO relay for NO/NC output. A four per cent duty cycle communication interchange occurs every two seconds.

Click on the link above to download the data sheet.

Key information

  • The BL118 board is compatible with any Radiometrix BiM-pin-out module; the best power-versus-range performance with the BL118 is achieved using the VHF BiM1 module.
  • With a 10mW BiM1-173.225-10 module fitted, the average current consumption is 1mA (relay off), achieving an open-field range that exceeds 500m; this allows for a two-year operating life from D cells with a continuous data link.
  • Each unit consists of a 76 x 62mm board; a mounted radio module; output, input and support circuits; LED indicators; and the BL118 chip itself.
  • The system address is set on an eight-way DIP switch and an SMA/MCX connector is provided for the antenna.
  • I/O and power connection use 3.81mm-pitch two-part terminal blocks.
  • The company offers 5V and 12V versions, differing in the relay type fitted, and the basic board is easily further customised for specific applications.

Pioneers of Low Power Radio – Since 1985

Based in the UK, Radiometrix is recognised as the leading global developer of ISM Band/ SRD FM low power radio modules.

We design and manufacture high-quality and cost-effective VHF and UHF radio modules that cater for the wireless needs of OEMs worldwide. Available on all major frequencies (151, 169, 173, 433, 458, 868 & 914 MHz), we offer a wide variety of modules to suit a diverse range of licence-exempt and licenced applications. The off-the-shelf modules can be customised to meet specific requirements.

Product portfolio

  • 12.5kHz, 25kHz Narrow Band & Wide Band FM
  • Transmitters, Receivers, Transceivers & RF Modems
  • Single-channel and Multi-Channel operation
  • 151, 169, 173, 433, 458, 868 & 914 MHz
  • UHF & VHF ISM bands
  • FCC Part 90 Compliant, FCC Part 15 compliant
  • Class 1 performance
  • Encoders & Decoders for RF remote control
  • Radio Packet Modems
  • Radio Packet Controllers
  • Evaluation Kits
  • Accessories – Antennas & Connectors


    Why Radiometrix?

    • Products designed and manufactured to the highest standards
    • Superior RF Performance, low power requirements
    • Radiometrix products are designed and verified to fully comply with FCC/ETSI or regional radio standards.RoHS Compliant
    • RoHS Compliant radio modules (lead-free)
    • Comprehensive portfolio of products
    • We test every single module


    • In-house technical support prior to, during and after sales
    • Custom design – in-house R&D and design
    • Long term availability of our products
    • Highly competitive volume pricing – contact Sales for quotations
    • Reduced time-to-market
    • Flexibility – we will do our very best to find a solution that meets your requirements

    Expertise – Low Power Radio is what we do

    • Over 25 years experience specialising in low power radio
    • Reputation for technical excellence
    • Team of leading RF industry engineers 

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