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Vol: 61(75) No: 1 / March 2016 Site-General Indoor Loss Propagation Model Adjustment for 868 MHz RF Modules Dalibor Dobrilovic Department of Information technology, University of Novi Sad, Technical Faculty “Mihajlo Pupin” - Zrenjanin, Djure Djakovica bb, 23000 Zrenjanin, Serbia, phone: (+381) 23-550-515, e-mail: ddobrilo@tfzr.rs Borislav Odadzic Department of Information technology, University of Novi Sad, Technical Faculty “Mihajlo Pupin” - Zrenjanin, Djure Djakovica bb, 23000 Zrenjanin, Serbia, e-mail: borislac.odadzic@tfzr.rs Zeljko Stojanov Department of Information technology, University of Novi Sad, Technical Faculty “Mihajlo Pupin” - Zrenjanin, Djure Djakovica bb, 23000 Zrenjanin, Serbia, e-mail: zeljko.stojanov@tfzr.rs Keywords: wireless sensor networks; open-source hardware; ITU indoor loss propagation model; RF modules 868 MHz; site-general indoor loss propagation model adjustment Abstract Site-specific indoor loss propagation models require deep knowledge of building layouts and materials, furniture deployment, transceiver locations, etc. The site-general models are far easier to apply, but have lack of accuracy comparing to site-specific models. In this paper is presented the approach in adjustment of ITU site-general indoor loss propagation model in order to be used for particular building. The adjustments are based on measurements made with open-source hardware platform. The main advantage of this platform, its modularity, is explored here in order to make model adjustments with more than one communications module type. In this research, the focus was on communication modules operating at 868 MHz band. These modules were chosen because they can be good alternative for 2.4 GHz communication modules in order to avoid existing interference in that band. Together with the model adjustment, experimental measurements are used to justify utilization of 868 MHz technology for Wireless Sensor Networks in particular building. References [1] T. Chrysikos, S. 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