kv4p HT – Turn an Android smartphone into a ham radio transceiver

kv4p HT is an open-source hardware VHF or UHF radio designed to plug into the USB-C port of an Android smartphone and turn it into a handheld ham radio transceiver. It's based on an ESP32 wireless module and an SA818 radio module. This accessory makes your phone capable of off-grid voice and text communication with a Technician-class amateur radio license. It's small enough to fit into a pocket, partially because it does not need a battery, relying on the built-in battery of your phone. kv4p HT V2.0 specifications: Wireless module - ESP32-WROOM-32E-N4 SoC – ESP32 dual-core Tensilica LX6 microcontroller @ up to 240 MHz with 520KB SRAM Storage – 4MB flash Wireless - 2.4 GHz WiFi 4 and Bluetooth 4.2 BR/LE connectivity, built-in PCB antenna VHF Radio SA818-V radio module or DRA818V (134 - 174MHz) VHF low-pass filter SMA antenna connector Tx Power - Up to 1 Watt for several