Rsclub2_2andClaude Fable 5.1
7b44eb0c2e
* test: pin the Maidenhead and great-circle maths of Location against definitions (#108) Subsquare centres from the Maidenhead definition, round trip through toMaidenhead (lower-case subsquare pinned as is), distance and bearing between locators against an independent spherical computation on R = 6371.009 km, consistency with PathGeometryUtils, and the NaN bearing for identical points pinned as current behaviour. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> * test: pin PathGeometryUtils against ITU-R P.525/P.526 and textbook values (#108) Great circle against the Veness worked example, Fresnel radius against P.526-15 eq. (2) and (3), earth bulge against the 8500 km effective radius, radio horizon against 4.12*sqrt(h), knife-edge loss J(v) against eq. (31), the v parameter against eq. (26), free-space loss pinned at the project's 32.44 constant with the P.525 and exact values documented, plus wattsToDbm, the sample-count rule and the k-factor sanitiser. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> * test: pin the path-analysis pipeline on a flat profile (#108) A flat 20 km profile with 10 m antennas at 144.3 MHz through an in-memory terrain provider: bulge, line-of-sight clearance, first Fresnel radius and intrusion, no knife edge and 0 dB diffraction. Pins that a partial Fresnel intrusion without a blocked line of sight contributes 0 dB to the link budget; P.526 would give 0 to 6 dB there, which is tracked separately. Fixes #108 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
KST4Contest
KST4Contest is a Java-based client for the ON4KST chat, developed for coordinated VHF, UHF and microwave contest operation.
The application is developed by Marc Fröhlich (DO5AMF) and since 2026 Philipp Wagner (DN9APW).
Start here
- Project website
- Download Stable, Beta and Nightly builds
- Online manual
- GitHub wiki
- Issues and bug reports
- Development roadmap
What KST4Contest does
KST4Contest combines the ON4KST chat with information that is useful when coordinating contacts during a contest.
Among other things, it can:
- display and filter stations from the supported ON4KST chat categories;
- derive band and frequency information from chat messages and station names;
- maintain Worked and NOT QRV information for the available bands;
- calculate station priorities from distance, activity and other available information;
- manage internal skeds and received Win-Test skeds;
- use AirScout information when evaluating possible aircraft-scatter contacts;
- display stations, paths and additional propagation information on maps;
- exchange information with supported logging programs, Win-Test, PSTRotator and a local DX Cluster interface;
- provide configurable automatic replies for recurring chat requests.
Calculated scores, aircraft-scatter information and path assessments are operating aids. They depend on the available data and should not be treated as guarantees that a contact is possible.
Installation
Ready-to-use packages are available for Windows, Linux and macOS. These packages include the required Java runtime, so a separate Java installation is normally not necessary.
Use the central download page to select the appropriate build:
- Stable is intended for normal contest operation.
- Beta contains changes that are being prepared for a stable release.
- Nightly contains the latest automated development build and is mainly intended for testing.
Documentation
The documentation is available in German and English:
The Markdown sources used for the wiki and the generated PDF manuals are stored in github_docs.
Changes to operating behaviour should be documented together with their purpose and limitations. This is especially important for functions whose result depends on external data, heuristics or information derived from chat messages.
Building from source
Building KST4Contest requires JDK 21. The Gradle Wrapper included in the repository should be used, so a separate Gradle installation is not required.
Linux and macOS:
./gradlew clean build
Windows:
.\gradlew.bat clean build
Repository structure
core/– domain, controller and network code, free of user-interface technologyapp-desktop/– the Compose Multiplatform user interface and the packaging tasksgithub_docs/– German and English manual sourceswebsite/– project website sourcespackaging/– platform-specific packaging files
CI status
Documentation
Builds
License
KST4Contest is distributed under the GNU General Public License v3.0.