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gr-m17 examples

For a first test, jump to m17_loopback.grc which does not use external tools but is GNU Radio only. The two m17_rx.grc and m17_tx.grc are for debugging and validation purposes of the conversion from libm17 to GNU Radio block.

m17_rx.grc

This receiver testing example relies on ../M17_Implementations/SP5WWP/m17-coder/m17-coder-sym to broadcast a signal. Following this unit testing example, run this flowchart along with

mkfifo /tmp/fifo1
mkfifo /tmp/fifo2
python3 ../M17_Implementations/SP5WWP/grc/m17_streamer.py
../M17_Implementations/SP5WWP/m17-coder/m17-coder-sym < /tmp/fifo1 > /tmp/fifo2 &

and the output of python3 ./m17_rx.py should be

...
DST: ALL       SRC: AB1CDE    TYPE: 0005 META: 0000000000000000000000000000 LSF_CRC_OK 
DST: ALL       SRC: AB1CDE    TYPE: 0005 META: 0000000000000000000000000000 LSF_CRC_OK 
DST: ALL       SRC: AB1CDE    TYPE: 0005 META: 0000000000000000000000000000 LSF_CRC_OK 
DST: ALL       SRC: AB1CDE    TYPE: 0005 META: 0000000000000000000000000000 LSF_CRC_OK 
DST: ALL       SRC: AB1CDE    TYPE: 0005 META: 0000000000000000000000000000 LSF_CRC_OK 
...

It would be wise to execute from a terminal rather than the GNU Radio Companion graphical interface to avoid flooding the console.

m17_tx.grc

This transmitter testing example relies on ../M17_Implementations/SP5WWP/m17-decoder/m17-decoder-sym to decode a signal. Following this unit testing example, run this flowchart along with

mkfifo /tmp/fifo1
mkfifo /tmp/fifo2
../M17_Implementations/SP5WWP/m17-decoder/m17-decoder-sym < /tmp/fifo2

and the output of python3 ./m17_tx.py should be

DST: AB2CDE    SRC: AB1CDE    TYPE: 0005 META: 48656C6C6F210000000000000000 LSF_CRC_OK 
FN: 0018 PLD: 01020304050600000000000000000000 e=0.0
FN: 0019 PLD: 01020304050600000000000000000000 e=0.0
FN: 001A PLD: 01020304050600000000000000000000 e=0.0
FN: 001B PLD: 01020304050600000000000000000000 e=0.0
FN: 001C PLD: 01020304050600000000000000000000 e=0.0
FN: 001D PLD: 01020304050600000000000000000000 e=0.0
DST: AB2CDE    SRC: AB1CDE    TYPE: 0005 META: 48656C6C6F210000000000000000 LSF_CRC_OK 
FN: 001E PLD: 01020304050600000000000000000000 e=0.0

m17_loopback.grc

Loopback demo with TX and RX both in GNU Radio.

The output should be

DST: AB2CDE    SRC: AB1CDE    TYPE: 0005 META: 48656C6C6F210000000000000000 LSF_CRC_OK 
DST: AB2CDE    SRC: AB1CDE    TYPE: 0005 META: 48656C6C6F210000000000000000 LSF_CRC_OK 
DST: AB2CDE    SRC: AB1CDE    TYPE: 0005 META: 48656C6C6F210000000000000000 LSF_CRC_OK 
DST: AB2CDE    SRC: AB1CDE    TYPE: 0005 META: 48656C6C6F210000000000000000 LSF_CRC_OK 
DST: AB2CDE    SRC: AB1CDE    TYPE: 0005 META: 48656C6C6F210000000000000000 LSF_CRC_OK 
DST: AB2CDE    SRC: AB1CDE    TYPE: 0005 META: 48656C6C6F210000000000000000 LSF_CRC_OK

m17_loopback_noisy.grc

Loopback demo with the addition of noise, no modulation/no channnel.

m17_loopback_noisychannel.grc

Loopback demo with a noisy channel, including full modulation & demodulation.

transmitterPLUTOSDR.grc

M17 transmitter with ADALM Pluto SDR or Ettus Research B210.

receiverRTLSDR.grc

M17 receiver with RTL-SDR. Automatic Frequency Correction can be enabled as an option.

Complete demonstration

Resulting demonstration of wireless communication between a B210 emitting the signal and RTL-SDR dongle as receiver.