kv4p HT v1.8b (0.9" narrow 38-pin ESP32)
NOTE: This PCB variant (v1.8b) fits the narrow 38-pin ESP32 dev boards, with 0.9" (22.9mm) spacing between rows of pins. Use v1.8a for wider dev boards, and use v1.8c for 30-pin dev boards.
kv4p HT is a homebrew VHF radio that makes your phone capable of voice and text communication completely off-grid with at least a Technician class amateur radio license.
The radio simply plugs into the USB C port on your Android smartphone and transforms it into a fully-fledged handheld radio transceiver. It's completely open source (GPL3): the Android app, ESP32 firmware, PCB designs, and 3D printer files.
It's small enough to fit in your pocket and take anywhere, and since it has no internal battery it's the perfect emergency radio to put in a go-bag or your car's glove compartment.
See https://kv4p.com for instructions, open source code, and more information!
kv4p HT v1.8b (0.9" narrow 38-pin ESP32)
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