NOTE: This PCB variant (v1.8c) fits the 30-pin ESP32 dev boards.

Use the variant (a, b, or c) that matches the size of your ESP32 dev board:

• kv4p HT v1.8a (1" wide 38-pin ESP32)
• kv4p HT v1.8b (0.9" narrow 38-pin ESP32)
• kv4p HT v1.8c (30-pin ESP32) <-- this design

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!