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.

Choose the signal and radio

• 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.

Antennas and coverage

• 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.

Use extensions

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

Write extensions

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.

User guides

• 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.

Build your own software

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.

Other receiver and digital-mode guides

• SDR Console setup
• Digital television reception
• Digital television transmission
• DRM transmission
• Community radio stations: stations described by their operators.