Question on Useage about rpitx HOT 1 CLOSED

Hello,
I don't know if it is the best way to capture an iq signal this way. I think your file it is to big, and contains eroneous data due to aliasing.
I would recommend using gnuradio to do this by creating a capture graph, whith correct filtering.
Then in you graph you can have an ouput sink that writes the iq file.
In gnuradio you will be able as well to demod your signal, I guess yours is OOK (On Off keying, similar to morse).
I played with that a while ago, and I was able to record and decode properly various home devices: Door bell, alarm sensors.
I haven't use rpitx yet to try the replay mode, which I would like to.

If you are new to gnuradio, there are good tutorials on youtube based on hack rf, but the examples can be adapted easily to an RTLSDR stick.

from rpitx.