QuestaSDR is a simple, modern, intuitive interface, small and fast PC-based DSP application for Software Defined Radio (SDR). It’s written in C++ and Qt Quick cross-platform framework. Typical applications are Shortwave listening, Ham Radio, Radio Astronomy and Spectrum analysis.

Download for Windows

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  • QuestaSDR

    QuestaSDR version 3.0.1

  • QuestaSDR Start Activity

    QuestaSDR Start Activity

  • QuestaSDR Bookmarks

    QuestaSDR Bookmarks

  • QuestaSDR Frequency Keyboard

    QuestaSDR Frequency Keyboard

  • QuestaSDR Control Drawer

    QuestaSDR Control Drawer

  • QuestaSDR Perfomance Manager

    QuestaSDR Perfomance Manager

System Requirements

  • The software was developed and tested on Windows 10 64 bit, KDE neon LTS 5.8, and Android 4.4 KitKat. It may also work on Windows 7 and Windows 8, 10 32-bit, but this cannot be guaranteed.
  • Sound card with stereo line input

Radio Hardware

  • HiQSDR
  • AirSpy R1/R2, AirSpy mini, SpyVerter
  • RTLSDR with rtl_tcp server
  • Simple sound card qsd receivers with a fixed frequency oscillator ( QuRX Xtall )

Main features

  • Supported Windows operating systems
  • RF spectrum with change the FFT size (2048 - 8192) and change FPS Waterfall
  • Waterfall color theme
  • SSB (USB, LSB), AM,  WFM demodulation
  • Frequency manager
  • Record and playback RF IQ files, record AF WAV files
  • Samplerate, frequency, level and iq disbalance calibrate
  • Supported IF-adapter, upconverter, downconverter hardware
  • Keyboard shortcuts
  • Web view wideband spectrum
  • SoundCard SDR device support LO control fixed frequency or ExtIO plugin

Licencing & Legal

This software is available free of charge only for hobby users such as radio amateurs and radio enthusiasts. Commercial and government users must should contact me to discuss terms of use.