Lightweight, portable software-defined radio
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Latest commit 7b2a6d4 Feb 11, 2018

leansdr: Lightweight, portable software-defined radio.

Copyright (C) 2016

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see

leansdr consists of:

  • A simple data-flow framework for signal processing
  • A C++ library of software-defined radio functions
  • Applications built on top of the above.

Currently the main application is leandvb.


leandvb is a DVB-S demodulator designed for speed rather than sensitivity.

See for details and use cases.

Quick start guide

git clone
cd leansdr/src/apps

Receiving DATV transmissions from the ISS with a RTL-SDR dongle:

rtl_sdr  -f $DOWNCONVERTED_FREQ  -s 2400000
./leandvb  -f 2400e3  --sr 2000e3  --cr 1/2   <  > capture.ts
mplayer capture.ts


./leandvb  --gui  -v  -d  -f 2400e3  --sr 2000e3  --cr 1/2  <  > capture.ts

Live receiver with auto-detection of symbol rate and code rate:

rtl_sdr  -f $DOWNCONVERTED_FREQ  -s 2400000  -  |  ./leansdrscan  -v  ./leandvb --gui  -f 2400e3  --sr 2000e3,1000e3,500e3,250e3  --cr 1/2,2/3,3/4,5/6,7/8  -  |  mplayer  -cache 128  -