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# Application note on using rpitx
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The recently released <a href="https://github.com/F5OEO/rpitx">rpitx</a> by Evariste, F5OEO allows us to transmit an RF signal over GPIO18 (pin 12) of a Raspberry Pi. The software can accept an I/Q signal as an input, so now a Pi can be used as a general purpose SDR transmitter.
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This document is about using <a href="http://gnuradio.org/">GNU Radio</a> and <a href="https://github.com/simonyiszk/csdr">csdr</a> with *rpitx*.
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**Table of contents**
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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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<br /><br />
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![Warning](/images/lpf-warning.png?raw=true)
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<br /><br /><br />
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<br /><br />
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The output of the Raspberry Pi GPIO 18 is a square wave, which contains harmonics.<br />
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For example, if you transmit on 28 MHz, you will also transmit on:
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* 28 × 3 = 84 MHz
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* 28 × 5 = 140 MHz
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* 28 × 7 = 196 MHz<br/>...
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...and actually you may distrub some important radio communication services. Please don't do this! You can get into trouble! You have been warned.
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If you ever want to connect this to a real antenna, you should use a low-pass filter, like the <a href="http://rfsparkling.com/qrpi">QRPi board</a>. In addition, only transmit if you have a proper license to do so.
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## Using a Raspberry Pi as remote software defined radio peripheral from GNU Radio
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