kv4p HT is a unique homebrew VHF radio that can turn your Android smartphone into a fully-functioning handheld radio transceiver, allowing for off-grid voice and text communication with an amateur radio license. It’s open source, costing only $35 to build, with crystal-clear audio, texting capabilities, and the ability to scan through unlimited memories and groups. The radio operates on your phone’s battery, making it portable for on-the-go use. Note that kv4p HT offers no warranty, but it provides a fun and innovative way to stay connected in remote areas.
https://www.kv4p.com/