Turn your Android smartphone into a modern ham radio transceiver

kv4p HTTurn your Android phone into a modern ham radio transceiverOpen source hardware & software for makers and tinkerers, 1 watt VHF or UHF View on GitHub Join Discord

Note: kv4p HT is an open source project you build yourself. It has absolutely no warranty, or guarantees on functionality or reliability! Requires at least a Technician class amateur radio license to use. That said, have fun. :)

Inexpensive BuildJust a few components to solder, buy the parts yourself or get a kit.Android PoweredLeverages your phone's screen, GPS, and battery. No separate charging needed.Full-Featured APRSBuilt-in 1200 baud modem for SMS-like text messaging plus position beaconing, unlike most radios that only offer beaconing.Fully Open SourceGPL3 licensed: Android app, ESP32 firmware, PCB designs, and 3D printer files.No Internal BatterySips power from your phone. Perfect for go-bags or glove compartments.Accessible DesignLive closed captions, sticky PTT with haptic feedback, and animation controls.

2Solder the Board Solder the radio module and any through-hole components to your PCB Trim the SMA connector legs flush so they won't contact your phone If you bought a kit, this may already be done for you 4Assemble Snap the PCB into the 3D printed case Cut a thin strip from the sticky gel pad to attach kv4p HT to your phone Screw on the antenna 5Flash Firmware and NVSIf you bought a kit, the vendor likely already did this step. Otherwise, you'll need to flash the ESP32:6Install the AppRequires Android 8+ (2017 or newer).