kopia lustrzana https://github.com/ha7ilm/rpitx-app-note
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README.md
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@ -53,13 +53,26 @@ On the PC, open GNU Radio Companion, and load the flow graph in this repo at `gn
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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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* Note that the frequency translation is there on intention. On some unkown reason, the spectrum is quite distorted 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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### SSB modulator example in GNU Radio
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Use the flow graph in `gnuradio/ssb-rpitx`.
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This will transmit an USB signal.
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![SSB in GNU Radio](/images/grc-ssb.png?raw=true)
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The spectrum of the transmitted I/Q signal looks like this:
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![SSB in GNU Radio](/images/grc-ssb-running.png?raw=true)
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After receiving it with RTL-SDR and GQRX:
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![SSB in GQRX](/images/gqrx-ssb.png?raw=true)
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## Using rpitx with csdr to modulate streaming input
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