kopia lustrzana https://github.com/ha7ilm/rpitx-app-note
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## Using a Raspberry Pi as remote software defined radio peripheral from GNU Radio
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(TODO)
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To do this, you will need:
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* a PC running GNU Radio on Linux,
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* a Raspberry Pi with *rpitx* installed,
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* both connected to the same network.
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We will stream the I/Q signal from the PC to the Raspberry Pi via TCP.
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On the Raspberry Pi, execute:
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nc -l 8011 | sudo rpitx -i- -m IQFLOAT -f 28400
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* This will listen on TCP port 8011 for the I/Q signal.
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* The center frequency of the transmitter will be 28400 kHz.
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On the PC, open GNU Radio Companion, and load the flow graph in this repo at `gnuradio/nfm-rpitx`.
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![NFM in GNU Radio](/images/grc-nfm.png?raw=true)
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If you execute it, the I/Q signal will be streamed to the Raspberry Pi through the TCP socket.
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* Note that the frequency translation is there on intention. On some unkown reason, the spectrum is quite bad if our signal is centered at DC.
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Here is the good result if received with an RTL-SDR and GQRX:
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![NFM in GQRX](/images/gqrx-nfm.png?raw=true)
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## Using with csdr to modulate streaming input
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<a href="https://github.com/simonyiszk/csdr">csdr</a> is a command line tool for simple DSP tasks. It can be used to build simple AM/FM/SSB receivers, and now transmitters as well, and is quite fast to setup.
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You will need the *dev* branch of *csdr* for doing this.<br />
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Setup instructions:
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