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András Retzler 2015-11-08 22:05:38 +01:00
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@ -9,6 +9,7 @@ This document is about using [GNU Radio](#using-a-raspberry-pi-as-remote-softwar
* [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)
* [NFM modulator example for GNU Radio](#nfm-modulator-example-for-gnu-radio)
* [SSB modulator example for GNU Radio](#ssb-modulator-example-for-gnu-radio)
* [AM modulator example for GNU Radio](#am-modulator-example-for-gnu-radio)
* [Using rpitx with csdr to modulate streaming input](#using-rpitx-with-csdr-to-modulate-streaming-input)
* [Modulate from raw audio file](#modulate-from-raw-audio-file)
* [Modulate from microphone input source](#modulate-from-microphone-input-source)
@ -81,6 +82,21 @@ If you want **LSB**, you should double-click the "Band Pass Filter" block, and c
![SSB in GQRX](/images/grc-ssb-bpf.png?raw=true)
### AM modulator example for GNU Radio
Use the flow graph in `gnuradio/am-rpitx`.
This will transmit an **AM** signal.
![AM in GQRX](/images/grc-am.png?raw=true)
The spectrum of the transmitted I/Q signal looks like this:
![AM in GQRX](/images/gqrx-am-running.png?raw=true)
After receiving it with RTL-SDR and GQRX:
![AM in GQRX](/images/gqrx-am.png?raw=true)
## Using rpitx with csdr to modulate streaming input
<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.