I am not the author of this application, I just:

added 2.16M Samplerate, Useful due to being a multiple of both 28.8 and 48k, the xtal in the rtl, and the audio output. Allows decimation without needing resampling to optimize cpu use

Hardcoded a ppm offset into CubicSDRDefs.h for one of my sticks (ppm0)

Removed AGC and hardcoded to '34' as gain to suit E4000 under most uses

Changed fft from 2048 to 16k as my pc will handle it and it looks prettier

Top notch effort by the author on the recent changes

Cross-Platform Software-Defined Radio Application

• liquid-dsp (http://liquidsdr.org/ https://github.com/jgaeddert/liquid-dsp)
• FFTW (http://www.fftw.org/ https://github.com/FFTW/fftw3)
• RtAudio (http://www.music.mcgill.ca/~gary/rtaudio/ http://github.com/thestk/rtaudio/)
• Osmocom RTLSDR (http://sdr.osmocom.org/trac/wiki/rtl-sdr)
• LodePNG (http://lodev.org/lodepng/)
• BMFont (http://www.angelcode.com/ http://www.angelcode.com/products/bmfont/)
• Bitstream Vera font (http://en.wikipedia.org/wiki/Bitstream_Vera)
• OpenGL (https://www.opengl.org/)
• wxWidgets (https://www.wxwidgets.org/)
• CMake (http://www.cmake.org/)

• Simple UI
• Devices
  • RTL-SDR
  • rtl_tcp
  • HackRF
  • Whatever else I can get my hands on
• Basic Features
  • Device Selection
  • Bandwidth
  • Color scheme
  • Load/Save session
  • Audio sample rate
  • Device PPM
  • Default preferences
    • Audio defaults
    • Device defaults
  • Bookmarks
• Neat Visuals
  • Scope
  • Spectrum
  • Waterfall
  • Audio Spectrum
  • More 2D visuals
    • Add faint grid for sense of scale
    • Indicate outer spectrum edges when zoomed
  • 3D visuals
• Demodulation:
  • Basic modular expansion
  • Multiple demodulators per IQ stream
  • Audio device selection
  • Modes
    • FM
    • FM stereo
      • Experimental, needs improvement
    • AM
    • LSB
    • USB
    • DSB
    • RAW
  • Controls
    • Display Frequency and allow manual adjustments
    • Allow selection of demodulation type
    • Display separate zoomed-in view of current waterfall and spectrum, allow adjustments
    • Display signal level and allow squelch control
    • Display audio output selection
    • Volume control
    • Demodulator input filtering
    • Audio filtering
• Basic Input Controls
  • Drag spectrum to change center frequency
  • Hold shift and click on waterfall to create a new demodulator
  • Clicking waterfall adds new demodulator when none visible
  • Drag center of demodulator on waterfall to change frequency
  • Drag edge of demodulator on waterfall to change bandwidth
  • Double-Click to move demodulator to frequency within it's current range
  • Hold alt and drag range on waterfall to set demodulator frequency + bandwidth
  • Hold alt+shift and drag range on waterfall for a new demodulator
  • Hover demodulator on waterfall and press 'space' to toggle stereo
  • Hover demodulator on waterfall and press 'd' or 'delete' to delete it
  • Keyboard arrows adjust frequency, shift for faster change
  • Undo / Redo action
• I/Q Recording and playback
  • Recording
    • Record I/Q input data
    • Simultaneously record demod decimated I/Q and audio
  • Playback
• Audio
  • Recording
• Optimization
  • Eliminate large waterfall texture uploads
  • Update visuals to OpenGL 3.x
  • Resolve constant refresh on visuals that don't change often
  • Resolve driver/platform vertical sync issues
  • Group and divide IQ data distribution workload instead of 100% distribution per instance

• Design a plan for expansion via modules (dylib/dll/lua)
• Support shell-based stdin/stdout tools for direct output/playback to/from CLI audio processing apps (i.e. DSD on OSX)
• Update visuals to support OpenGL ES
• Basic demodulator filter(s) that can be enabled and tweaked visually
• Support multiple simultaneous device usage
  • Categorize devices by antenna connections
  • Allow locked frequencies to activate unused devices to continue demodulation on same antenna
• Implement digital demodulation supported by liquid-dsp: (http://liquidsdr.org/doc/modem.html)
  • PSK, DPSK, ASK, QAM, APSK, BPSK, QPSK, OOK, SQAM, Star Modem(?)
• Integrate LUA
  • Expose liquid-dsp functionality
  • Scriptable liquid-dsp demodulation
  • Scriptable digital demodulation output handlers
    • Create block output devices on *nix?
    • Create socket outputs?
    • Visual outputs?
  • Take control of additional devices and spawning new demodulators (i.e. trunkers)
  • Script manager / live editor
  • Provide scriptable liquid-dsp modulation for trancievers?
• "PVR" like mode with waterfall time shifting
• L/R and surround-sound balance settings for separating and listening to mono streams
• Add tool for converting decimated I/Q recording to video
  • Select video features such as title/demodulation/scope/waterfall/etc
  • Render to video from GL frames->ffmpeg/mencoder /w demodulated audio
• Accessability / Control
  • USB/MIDI control surfaces
  • Joystick / gamepad input
  • Vibration / force-feeback
• Investigate compilation via emscripten using rtl_tcp for input
  • Create web server+rtl_tcp bundle for embedded devices
  • Use emscripten compiled CubicSDR via embedded web server

• OSX
• Windows
• Linux
• HTML5

• GPL