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Abstract: This paper aims to provide a general overview of SDRs, their history, need, basic operation and benefits, along with a basic hardware realization of SDR receiver using Arduino Nano microcontroller. Software Defined Radio or SDR is one of the most important technologies and is essential for a modern wireless communication system. SDRs are known for their versatility as they can be customised to operate on any frequency band, or can have different implementations of modulation and demodulation schemes and different communication standards in the same device. This is done by using reconfigurable and reprogrammable hardware and robust and powerful software. SDRs are easy to manufacture, are multi-functional, compact, power efficient and easy to upgrade. Key Word: Software Defined Radio, SDR, SDR receiver, Hardware Realisation of SDR. References [1]. J. Mitola III, “Software radios - survey, critical evaluation and future directions,” in Telesyst. Conf., 1992. NTC-92., National, May 1992, pp. 13/15–13/23. [2]. W. Tuttlebee, Software Defined Radio: Enabling Technologies. Chichester: Wiley, 2002. [3]. P. B. Kenington, RF and Baseband Techniques for Software DefinedRadio. Boston: Artech House, 2005. [4]. Software Defined Radio Forum. (2007, Oct) SDR Forum. [Online].Available: http://www.sdrforum.org