rpitx radio transmitter for Raspberry Pi

Transmitting FM, AM, SSB, SSTV and FSQ with just a Raspberry Pi

rpitx radio transmitter for Raspberry Pi

rPiTx is a software which permit to transmit HF directly through a pin of Raspberry Pi GPIO. Unlike PiFM which transmit only in FM, PiTx is able to perform multi modulation (FM,AM,SSB,SSTV,FSQ) : it has an I/Q input to be agnostic.
The demonstration here is done in several steps :

  • – Record an I/Q file from a doorbell transmitter on 434MHZ (first part)
    – Playing it with the Raspberry Pi using Pitx on HF on same frequency
    – Listen to the doorbell receiver which recognize the signal

rPitx is now a real TRANSMIT SDR at very low cost. Be aware that it generate lot of harmonics and never compete with USRP or HackRF.
To transmit with the Raspberry Pi all you need to do is plug in a wire antenna to Pin 12 (GPIO 18) on the GPIO port and run the rPiTx software by piping in an audio file or image for SSTV. 

While the output power is very small, you should still take care as there is no filtering on the antenna output and transmissions could be causing harmonics all across the spectrum, possibly inferring with critical devices.

The code for rPiTX can be downloaded at https://github.com/F5OEO/rpitx.

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