The following document describes the development of a physical interface that allows communication between a two-way radio which works in the bands of the VHF and UHF spectrum, with the audio port of a Smartphone. An application that emulates the operation of a radio with PTT system is used in the mobile device. Thus, long-distance communication is achieved, reducing the costs of using repeater stations, as well as providing a more versatile communication alternative. The project is used by the "Corporación Radioclub Colombia", entity that groups the Colombian radio amateurs.