rpitx is a radio transmitter for Raspberry Pi (B, B+, PI2, PI3 and PI zero) that transmits RF directly to GPIO. It can handle frequencies from 5 KHz up to 500 MHz.
Before you transmit, know your laws. rpitx has not been tested for compliance with regulations governing transmission of radio signals. You are responsible for using your rpitx legally.
Created by Evariste Courjaud F5OEO. Code is GPL
Assuming a standard install of Raspbian:
git clone https://github.com/F5OEO/rpitx
cd rpitx
# make sure to have access to the internet to download packages
# or download and install them manually (libsndfile1-dev and imagemagick)
./install.shPlug a wire on GPIO 18, means Pin 12 of the GPIO header (header P1). This acts as the antenna. The optimal length of the wire depends the frequency you want to transmit on, but it works with a few centimeters for local testing.
rpitx is the main software to transmit. It allows to transmit from:
- IQ files *.iq (can be generated by external software like GNU Radio).
- Frequency/Time files *.ft (generally used to easily implement digital modes)
Usage:
rpitx [-i File Input][-m ModeInput] [-f frequency output] [-s Samplerate] [-l] [-p ppm] [-h]
-m {IQ(FileInput is a Stereo Wav contains I on left Channel, Q on right channel)}
{IQFLOAT(FileInput is a Raw float interlaced I,Q)}
{RF(FileInput is a (double)Frequency,Time in nanoseconds}
{RFA(FileInput is a (double)Frequency,(int)Time in nanoseconds,(float)Amplitude}
{VFO (constant frequency)}
-i path to File Input
-f float frequency to output on GPIO_18 pin 12 in khz : (130 kHz to 750 MHz),
-l loop mode for file input
-p float frequency correction in parts per million (ppm), positive or negative, for calibration, default 0.
-d int DMABurstSize (default 1000) but for very short message, could be decrease
-c 1 Transmit on GPIO 4 (Pin 7) instead of GPIO 18
-h help (this help).
Some modulations are included in this repository and can be easily extended. These scripts create files which can be used by rpitx. Some output in IQ (like SSB) other in FT (like SSTV).
pissb converts an audio file (Wav 48KHZ mono only!) to SSB (Upper Side Band right now) and outputs it to an IQ file. Assuming your audio file is in your current working directory:
./pissb audio48mono.wav ssbIQ.wavYou could then transmit it on 50MHz (please set a correct frequency to be legal)
sudo ./rpitx -m IQ -i ssbIQ.wav -f 50000 -lA sample script testssb.sh is included.
pifm converts an audio file (Wav, 48KHz, 1 channel, pcm_s16le codec) to Narrow band FM (12.5khz excursion) and outputs it to a .ft file. Assuming your audio file is in your current working directory
./pifm audio48mono.wav fm.ftYou could then transmit it on 100MHZ (please set a correct frequency to be legal)
sudo ./rpitx -m RF -i fm.ft -f 100000 -lA sample script : testfm.sh is included.
pisstv converts an RGB picture to a SSTV .ft file. The SSTV module will transmit using the Martin M1 encoding mode.
If you have a JPEG picture 320x256 you can convert it to an RGB picture with:
imagemagick convert -depth 8 picture.jpg picture.rgbYou can then transform it to a .ft file with:
./pisstv picture.rgb picture.ftAnd then transmit it to 100MHZ (please set a correct frequency to be legal)
sudo ./rpitx -m RF -i picture.ft -f 100000A sample script snapsstv.sh grabs a picture from a PiCamera and then transmits it on 50.105 MHz.
pifsq allows to send a text with the new FSQ modulation
It is still under development.
A sample script testfsq.sh allows to send a text with FSQ
A VFO mode is provided to allows precise frequency resolution. For example to set a carrier on 100MHz (please set a correct frequency to be legal)
sudo ./rpitx -m VFO -f 100000All rights of the original authors reserved. Special thanks to Sylvain Azarian F4GKR for improving SSB modulation Inspired by
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