This is a set of GNU Radio blocks written by Andras Retzler, HA7ILM <[email protected]>

These blocks are not perfect and have quite limited functionality, just enough for testing libcsdr.

The blocks were tested against GNU Radio v3.7.5-23-g1edeff17. To build:

mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig

• It spawns an external process with a given command-line. (You can use shell pipelines.)
• Its input is redirected to the STDIN of the process.
• The STDOUT of the process is redirected to the output of the block.
• It can deal with Float and Complex data.
• You should exit the running flowgraph by closing the WX GUI window (if there is one) instead of killing it in GRC.
  Doing the latter, the spawned external process(es) will not be closed properly.

It does the same as the previous one, but it does not have an output.

Note: if you would need something like an Execute External Process Source, just connect a Null Source to the input of the Execute External Process block.

It prints the minimal and maximal value for the received Float input buffers to the GRC console.

It works just as AGC2 (built into GNU Radio), but it outputs the gain envelope instead of the amplified signal.