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README.md
README.md
 
 
crosshairs.cpp
crosshairs.cpp
 
 
crosshairs.h
crosshairs.h
 
 
datacaptureftthread.cpp
datacaptureftthread.cpp
 
 
datacaptureftthread.h
datacaptureftthread.h
 
 
fftw3.h
fftw3.h
 
 
freqvline.cpp
freqvline.cpp
 
 
freqvline.h
freqvline.h
 
 
freqvlinemulti.cpp
freqvlinemulti.cpp
 
 
freqvlinemulti.h
freqvlinemulti.h
 
 
init_fft_win.cpp
init_fft_win.cpp
 
 
main.cpp
main.cpp
 
 
mainwindow.cpp
mainwindow.cpp
 
 
mainwindow.h
mainwindow.h
 
 
mainwindow.ui
mainwindow.ui
 
 
mysettings.cpp
mysettings.cpp
 
 
mysettings.h
mysettings.h
 
 
sdr-app.pro
sdr-app.pro
 
 
spchartview.cpp
spchartview.cpp
 
 
spchartview.h
spchartview.h
 
 
uio.cpp
uio.cpp
 
 
uio_c.h
uio_c.h
 
 
window_functions.cpp
window_functions.cpp
 
 
window_functions.h
window_functions.h
 
 

README.md

Overview

This is the sdr-app C++ software receiving sampled data from EBAZ4205 and displaying spectrum (TODO: waterfall) in its User Interface. It lets you to send commands to EBA4205 also to:

  • switch between the ADC input and a local RF test generator
  • change the local RF test generator frequency in the range 100 KHz - 32 MHz
  • tune radio stations
  • Set IF bandwith and IF gain

Software architecture

  • main.cpp is the classical main for qt5 applications
  • mainwindow.cpp and mainwindow.ui are ... the mainwindow!
  • spchartview.cpp is the spectrum window. It handles the sampled data, make the FFT and show it on a chart. It also intercepts the mouse events to change the tuned frequency on mousewheel event and so on
  • mysettings.cpp save and restore settings in /home/ebaz/.config/sdr-app/sdr-app.ini
  • crosshairs.cpp creates the red vert/horiz pointer
  • freqvline.cpp creates the vertical lines:
    • green for the tuned frequency
    • black for the lower and higher bandwidth boundaries
  • uio.cpp contains all the classes to interface the hardware components by /dev/uiox. For instance:
    • the switch to set the ADC input or the test generator is handled by the class ADCTestSwitch which maps /dev/uio0
    • the local oscillator is handled by the class DDS which maps /dev/uio3
    • ...

sdr-app usage

UI controls

  • IF Gain: it acts as an audio volume (there's no AGC)
  • FFT_Window: you can choose the FFT Windowing you prefer
  • IF BW (KHz): choose low values for AM demodulation and the lowest values 4 and 2 KHZ for LSB/USB demodulation
  • BFO (Hz): of course it is used on LSB/USB demodulation only. It must be manually set to the same value of IF BW
  • ADC in: select the ADC input
  • Test Gen In: select the Internal Test Generator
  • Test Gen (Hz): select the desired test frequency
  • Time Samples (for debugging only)
  • Spectrum (leave it set
  • Span View (KHz): it's automatically calculated by sdr-app (when you change the spectrum zoom) in the range 2MHz - 1KHz and set into the CIC_FT_IQ_4 filter to change the decimation of the output filter samples, obtaining the needed zoom effect. The table to convert from span view and decimation is here. https://hackaday.io/project/186329-32mhz-spectrum-sdr-ft8-in-an-fpga/details#:~:text=fixed%20FIR%20filter.-,about%20CIC%3A,-the%20number%20of
  • Waterfall: not implemented

Mouse actions

  • To change the spectrum zoom position the mouse pointer on the x-axis and then rotate the mouse wheel
  • To tune a radio station, you have to:
    • place the mouse in chart area and click the desired frequency. You see the vertical green line appearing
    • then rotate the mouse wheel. You see the vertical green line moving left and right
  • to shift the y-axis, drag the y-axis up or down