CE3TSK · JTDX Contest Edition

Downloads

Windows and Linux builds of JTDX Contest Edition, the documents, and the recorded air the measurements were made on. Everything here is free and licensed under the GNU GPL v3.

The program

Windowsx86_64 · v3.0.0-rc05

An installer. Windows 10 and 11, 64-bit.

jtdx_contest-3.0.0-rc05-win64.exe 30.1 MB

SHA-256 b821fb192d78695a76a8aabed26b025483525dd497d1ee1215e6083c0cc899d6

Linuxx86_64 · v3.0.0-rc04

An AppImage: one file, no installation. Built on Ubuntu 22.04, so it runs on that and anything newer.

JTDX_contest-3.0.0-rc04-x86_64.AppImage 46.4 MB

SHA-256 82537104d0544f2ab1e16982f152cced75e97f287b6d4b4deecd4f6777903dcf

Before you run it

Linux: make the file executable once, then start it: chmod +x JTDX_contest-*.AppImage and ./JTDX_contest-*.AppImage

Windows: the installer is not code-signed, so SmartScreen may warn about an unknown publisher. The SHA-256 above identifies the file you downloaded; SHA256SUMS holds both lines.

Earlier builds stay online: rc04 for Windows and rc03 for Linux.

Documents

How the decoder works The long explanation, with the diagrams. Reads in a browser, in eight languages. HTML · 615 kB The measurements as a paper Method, tables and conclusions in the form a club or a magazine can print. PDF · 244 kB Inside the FT8 decoder The pipeline drawn out, pass by pass. PDF · 541 kB What changed for WW Digi 2026 The contest support and the decoder work, as taken into that weekend. PDF · 246 kB All the documents in one archive The four above, to read offline. ZIP · 1.1 MB

The air the numbers came from

Benchmark WAV suites and the script Two recorded hours, the crowded-band files with their truth sets, and a script that replays them on your own machine and prints the same columns the documents quote. ↗ The complete source Every change, on GitHub, under the GNU GPL v3. ↗