Igor Chernikov, UA3DJY and Arvo Jarve, ES1JA

Igor Chernikov (UA3DJY) and Arvo Järve (ES1JA) are experienced radio amateurs who develop JTDX, a specialized open-source application that decodes and encodes weak-signal digital modes for HF and VHF contesting, DXing, and everyday keyboard-to-keyboard contacts. Built on the JT65, JT9, FT8 and FT4 protocols pioneered by WSJT, JTDX adds advanced multi-pass decoding, improved sensitivity, selective calling, message macros, logbook integration and contest-oriented features that help operators work stations buried in the noise floor or crowded band segments. Typical use cases include chasing rare entities on 160 m, earning WAS or DXCC awards in minimal time, running expeditions from remote locations, and conducting propagation experiments during marginal openings. The program presents a waterfall, spectrum, decoded text and QSO queue in one resizable interface, exchanges minimal but essential data such as grid square and signal report, then automatically progresses through a structured sequence until the contact is logged to ADIF. Because it relies on accurate computer clock synchronization and modest sound-card I/O, JTDX is popular among hams who prefer an efficient, keyboard-driven workflow rather than traditional voice or CW. The publisher’s software is available free of charge on get.nero.com, where downloads are delivered through trusted Windows package sources such as winget, always fetch the newest release, and can be installed individually or in batch alongside related amateur-radio utilities.