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FlipperZero: Month Battery Life with Firmware Update
Not a full SDR, but there are so many cheap hacky solutions that are quite enough for basic experimentation.
If transmit only, extremely low power output (enough for a few meters of range), terrible harmonics, On Off Keying (OOK) and potentially Binary Frequency Shift Keying (BFSK) are ok, a square wave generator is enough. Options include a Raspberry Pi (https://github.com/s7mx1/pihat) or a Si5351 breakout board ($10). If you abuse harmonics to get to the target frequency, even a USB serial adapter can be enough (https://hackaday.com/2018/12/06/your-usb-serial-adapter-just...).
Disclaimers: These options are educational, but certainly not very professional. They're also a fair bit off the well trodden HackRF/Gnuradio path. Lastly, please do get a ham radio license and play legally.
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The primary programming language of pihat is C.
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