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Signal source

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begreeen edited this page Sep 2, 2018 · 39 revisions

About

Signal source module aims to deliver I/Q data for demodulator. There are numerous supported signal sources. For each type of the source there are provided controls for parameters tuning.

Running

In main window go to tab "Signal source", choose proper source and click "Run source". It might take a while to show window with a signal source.

image

Available sources

Linux

  • Recorded I/Q files - you can choose a file with recorded signal - check I/Q files format. If center frequency of the I/Q file is not the PW-Sat2 center frequency, there is a frequency offset field (in Hz) where you can specify the actual offset: image

  • Funcube Dongle Pro+

  • RTL-SDR

  • Pluto SDR

  • Line in (SSB)

Windows

  • Recorded I/Q files
  • Funcube Dongle Pro+
  • Line in (SSB)

Software Defined Radio sources

SDR center frequency is set to "PW-Sat2 Frequency" + "Frequency Offset" to get rid of DC spike. Since rest of the software (i.e. Demodulator) expects PW-Sat2 signal at center frequency, Frequency Xlating FIR Filter GRC block is used in order to get rid of introduced "Frequency Offset".

Technical details

All signal sources are generated from GnuRadio Companion flow graphs, freezed by Pyinstaller and run from the main app. GnuRadio Companion flow graphs for all signal sources are available in our repository.

Example of flow graph for FCD+: image

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