Abstract: Spectrum analyzer is a very important tool in signal processing. Most of the spectrum analyzers available in the market are expensive. Android application is an ever present paradigm in modern era. This paper presents a low cost android radio spectrum analyzer using RTL-SDR dongle. Signal amplitude, gain, frequency, power, and bandwidth can be measured using this mobile application. Application is implemented using android studio which uses high level java language in the software section.

Keywords: spectrum analyzer, RTL-SDR, android, java.