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SimTX Wiki

SimTX is a shared radio simulation. Set up a virtual transmitter, send audio, and listen with a receiver. No physical radio or antenna is needed. Distance, antennas, and radio conditions affect what listeners hear.

Download SimTX and make your first transmission

The illustrated guide covers installation, account sign-in, server selection, a working example, listening, and saving your settings.

Learn in order

1. Download and transmit: follow one complete example from an empty desktop to your first TX session.
2. Find your way around: identify the controls and understand the meters.
3. Choose what to send: play a file, use a microphone, or send a stream.
4. Change frequency and coverage: choose and adjust an antenna, then learn why reception changes.
5. Add features: install modes, audio processors, tools, and themes without writing code.
6. Start to receiving: receiving signals and stations using any SDR app.

The transmitter window. The guide explains each marked area.

Find a specific answer

• Nothing happens or no sound? Use Troubleshooting.
• Which radio mode should I choose? See Modulation Modes.
• How do I save or share my station setup? See Station Configuration and Extension catalog.
• What do SWR, bandwidth, and IQ mean? See Radio terms.
• Looking for formulas or an API? Open the complete documentation index, including antenna calculations and every Lua API reference.
• Writing your own software? The SimTX API reference documents the account service and the game protocol, message by message. Start with the quick start.

Community and other ways to use SimTX

• Community radio stations: stations described by their operators.
• SDR Console, digital television reception, digital television transmission, How to receive and DRM transmission: additional community guides.
• Download the transmitter · SimTX website · SimTX Discord