Development of the Facility and Performance Studies Radio Modules Operating in Unlicensed Frequency Bands
Abstract
The installation is described and the results of the study of some characteristics of the RFM69CW transceiver module operating in the unlicensed frequency range are presented. Controlling the mode of operation of the module and setting its parameters were carried out via a software-implemented SPI interface with the reconfigurable myRI0 I/0 block, and the signals and spectra were recorded using the NI PXIe-5644R vector transceiver. The installation software is developed in the LabVIEW environment. The block diagrams of the programs for configuring the radio module and demodulating FSK and 00K signals are presented.
The change in the waveform and the corresponding changes in the radio signal spectrum are shown when the module settings in the GFSK and 00K signal transmission mode are changed. A nonmonotonicity of the dependence of the output power of the transmitter on the installed power is found. The results obtained can be used to evaluate other characteristics and other types of radio modules, as well as in the educational process as a basis for laboratory work on the course "Signal reception and processing technique".
DOI 10.14258/izvasu(2018)4-07
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Copyright (c) 2018 А.Я. Суранов
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