Documentation

Start and operate

SimTX Transmitter: what the application does and how the simulation fits together.
Getting Started: install the desktop app, sign in, create a station, transmit and receive.
Transmitter Interface: the Java transmitter's window, control by control.
Transmission Sources: audio files, streams, microphone, PipeWire, and external IQ.
Station Configuration: callsign, location and station presets in the Java transmitter.
Sessions and Queueing: start, stop, monitor, live edit, and reconnect.
Troubleshooting: a symptom-by-symptom checklist for the Java transmitter.
Radio terms: short explanations of unfamiliar terms and units.

Modulation Modes: choosing a mode and the full bandwidth table.
Radio Presets: simulated equipment types and their power levels.
Advanced Transmitter Settings: every transmitter parameter, range, and default.
SWR and Transmitter Protection: matching the antenna and understanding reduced power.
Power Amplifier Behaviour: heating, cooling, foldback, and session damage.

Antenna System: choose an antenna and tune it for the frequency.
Dipole Antenna, Inverted-V Antenna, Vertical Antenna
Yagi Antenna, Full-Wave Loop Antenna
End-Fed Half-Wave Antenna, Longwire Antenna, Beverage Antenna
Propagation Basics: nearby and distant reception, day and night, noise, and fading.
Antenna Calculations: wavelength, wire lengths, decibels, SWR, and the path budget.
NEC File Import: custom geometry, supported cards, and limitations.

Lua extensions: install and use modes, audio add-ons, tools, themes, and libraries.
Extension catalog: preview, install, update, and publish shared packages and presets.

Read Creating Lua extensions first. It contains a complete small package and the edit, reload, and test cycle.

Lua extension manifest: package identity, versions, types, and dependencies.
Lua extension API: registration, controls, inputs, and common helpers.
Lua modulation API: audio and IQ blocks, images, video, files, and sample rates.
Lua audio add-on API: the audio processing callback and block operations.
Lua action API: tools that read settings or control the transmitter.
Lua theme API: colors, fonts, and appearance.

SimTX Guide: all user guides for the desktop app.
SimTX Guide/Transmitting: the Transmit tab, sources, presets, sessions and push-to-talk.
SimTX Guide/Receiving: the Receive tab and the bridge to your SDR program.
SimTX Guide/Stations: stations, antennas, radios and visibility.
SimTX Guide/Satellites: launching a satellite, passes, Doppler and deorbiting.
SimTX Guide/Rotators and tracking: turning an antenna and following a satellite.
SimTX Guide/Map and coverage: the globe, station lists and coverage maps.
SimTX Guide/Catalog and add-ons: shared presets and packages, add-ons and actions.
SimTX Guide/Health: the server health report.
SimTX Guide/Settings and shortcuts: settings, the command palette and shortcuts.
SimTX Guide/Troubleshooting: problems and the app's messages.

The SimTX API reference is for developers who want to receive, transmit or read station data from their own programs.

SimTX API/Quick start: receive IQ with a short standard-library program.
SimTX API/Account service: sign-in, stations and satellites, server directory, game tickets and public endpoints.
SimTX API/Connection and handshake: the game protocol, version 25: TLS, the preface and the hello.
SimTX API/Receiver session, SimTX API/Transmitter session and SimTX API/Control session: the kinds of game session.
SimTX API/Stations and SimTX API/Satellites: persistent stations and user-launched satellites.
SimTX API/Packet list: every message, each with its own page.