kopia lustrzana https://github.com/ha7ilm/rpitx-app-note
Update README.md
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README.md
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README.md
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@ -9,6 +9,7 @@ This document is about using [GNU Radio](#using-a-raspberry-pi-as-remote-softwar
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* [Using a Raspberry Pi as remote software defined radio peripheral from GNU adio](#using-a-raspberry-pi-as-remote-software-defined-radio-peripheral-from-gnu-radio)
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* [NFM modulator example for GNU Radio](#nfm-modulator-example-for-gnu-radio)
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* [SSB modulator example for GNU Radio](#ssb-modulator-example-for-gnu-radio)
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* [AM modulator example for GNU Radio](#am-modulator-example-for-gnu-radio)
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* [Using rpitx with csdr to modulate streaming input](#using-rpitx-with-csdr-to-modulate-streaming-input)
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* [Modulate from raw audio file](#modulate-from-raw-audio-file)
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* [Modulate from microphone input source](#modulate-from-microphone-input-source)
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@ -81,6 +82,21 @@ If you want **LSB**, you should double-click the "Band Pass Filter" block, and c
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![SSB in GQRX](/images/grc-ssb-bpf.png?raw=true)
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### AM modulator example for GNU Radio
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Use the flow graph in `gnuradio/am-rpitx`.
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This will transmit an **AM** signal.
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![AM in GQRX](/images/grc-am.png?raw=true)
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The spectrum of the transmitted I/Q signal looks like this:
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![AM in GQRX](/images/gqrx-am-running.png?raw=true)
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After receiving it with RTL-SDR and GQRX:
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![AM in GQRX](/images/gqrx-am.png?raw=true)
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## Using rpitx 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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