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Remote Control Application Board creates 2-way wireless link.

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November 21, 2012 - Bi-directional control device, BL118, uses half duplex radio transceiver to establish 2-way wireless link for remote control applications. Radio link operates continuously, providing valid communication link indication; boards are used in pairs, master/initiator and slave/responder; and relays are activated when state of input on one board changes and vice-versa. With 10 mW BiM1-173.225-10 module fitted, average current consumption is 1 mA (relay off), achieving 500+ m open-field range.

BL118 Bi-directional Remote Control Application Boards

(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)

Radiometrix Ltd.
Hartcran House
Watford Hertfordsh, WD19 5EZ
United Kingdom

Press release date: November 8, 2012

Low power, easy-to-install wireless I/O control link

Leading wireless solutions specialist Radiometrix, has released the BL118 bi-directional control device, the latest addition to the company’s exciting new easy-to-install Control product range. Unlike the existing CTA88 family of control products which offer one-way wireless links, the new BL118 uses a half duplex radio transceiver to establish a two-way wireless link for remote control applications with a minimum of effort and no software input. The radio link operates continuously, providing a valid communication link indication.

The BL118 boards are 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. Compatible with any Radiometrix BiM-pinout wireless module, the best power vs 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 only 1mA (relay off), achieving an open-field range which exceeds 500m. This allows for a 2 year operating life from D cells with a continuous data link.

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 4% duty cycle communication interchange occurs every 2 seconds.

Each unit consists of a 76 x 62mm board, mounted radio module, output, input, and support circuits, LED indicators and the BL118 chip itself. System address is set on an 8 way DIP switch and an SMA/MCX connector is provided for the antenna. I/O and power connections use 3.81mm pitch two part terminal blocks. 5V and 12V versions are available, differing in the relay type fitted, and the basic board is easily further customised for specific applications.

The BL118 boards are ideally suited to high integrity wireless applications including security and fire alarm systems, RF remote control systems, industrial controls and long range telecontrol with Narrow Band FM radios.


For more information on the company, please visit our website:


Real Radios For Real Applications

Established in 1985 and headquartered in London, Radiometrix is recognised as a leading global developer of narrow and wide band radio communication modules. Our diverse product range is suitable for a variety of licensed and licence-exempt ISM/SRD wireless applications, and is available worldwide through our global sales and distribution network.

Contact Radiometrix

Editorial queries should be sent to

Sales queries should be directed to the sales department

Radiometrix Ltd
Hartcran House
231 Kenton Lane

Tel:  +44 (0) 208-909-9595
Fax: +44 (0) 208-909-2233

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