Founded in 2003, RADIO ACTIVITY is a dynamic and flexible engineering company, specialized in the design of radio devices and applications. Thanks to its vast experience and multi-disciplinary skills, our team of engineers designs, develops and continuously offers customized solutions to the PMR market. Our devices have already been installed in more than a hundred systems worldwide, thus showcasing our capabilities in supplying the best solution in a wide number of applications, ranging from a simple stand-alone repeater to a nation-wide system.

Products and IOP Certificates

Discover the functionalities of our newest generation of soft radio, based on Linux O.S. A world of features in a smart size: automatic multi-mode analog/DMR/POCSAG, SIP/RTP interface, soft antenna diversity reception, 1+1 assembly, WEB server support, remote control, and much more. We are happy to assist you during your system’s installation and set-up.

KAIROS’ sophisticated software and hardware platforms make it a powerful embedded workstation. It is based on a LINUX core which, thanks to the continuous development from thousands of users around the world, naturally interfaces IP devices and networks and easily allows a high level of customization, without heavily impacting development efforts.

“Kairos” is an ancient Greek word meaning the right moment in which everything happens. Perfect timing is the secret of Radio Activity digital simulcast technology. Years of research and field experience enabled us to fix the right moment in the core of our KAIROS series of radio base stations.



Our modular base stations/repeaters are largely used in many simulcast realizations all over the world. The basic model already features analogic and digital services. It can be equipped with a dual receiver to counteract fading effects through diversity space reception.


2016-001 Tier III RadioActivity SYS KA-450 and Hytera MS PD985

2016-002 Tier II RadioActivity SYS KA-450 and Hytera MS PD985

2016-006 Tier II RadioActivity SYS KA 450 and Motorola MS DP4801

2016-007 Tier III RadioActivity SYS KA-450 and Motorola MS DP4801

2016-008 Tier II RadioActivity SYS KA-450 and Kenwood MS TK-D340

2016-009 Tier II RadioActivity SYS KA-160 and TAIT MS TP9360-B1

2016-010 Tier III RadioActivity SYS KA-160 and TAIT MS TP9360-B1

2014-004 Tier II RadioActivity SYS and Sepura MS

2014-005 Tier II RadioActivity SYS & Motorola MS

April 2011 – Radio Activity and Hytera (Tier II)

July 2010 – Motorola Solutions and Radio Activity (Tier II)

We are here for our members, working to make DMR the most widely supported digital business radio standard in the world