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The primary medium for chat is Matrix, it can be accessed with a web browser or a separate app such as Element.

If possible, please join using an existing Matrix account or sign-up for an account on one of the public servers.

GNU Radio does host a server, but it costs per-user for people who sign up directly.

If you are using an app that asks for the Matrix homeserver URL should work. If that doesn't work use:

To join the main channel directly, use or search for rooms (eg, in the Element clients), using as a server name.

We have many other channels on Matrix, including channels for GNU Radio-related Amateur Radio discussion, GNU Radio in Education, VOLK, … . They are not bridged to IRC.


The chatrooms are also accessible from Discord thanks to a bridge allowing conversations to be shared with Matrix.


GNU Radio has several channels on the network where people talk about GNU Radio related topics. Unfortunately the connection between Matrix and IRC has been shutdown so conversations are no longer bridged between them. Most activity is on Matrix and Discord (using the bridge to reach the matrix channels).

#gnuradio is the official general project chat. Anything GNU Radio, SDR, and DSP related is welcome.

#gnuradio-dev is used for conversations and questions around the development of the code of GNU Radio itself.

A useful guide for Libera is the IRC commands cheat sheet.

Basic Etiquette in GNU Radio chat rooms

Some basic guidelines when going to the chat rooms, be it on IRC, on matrix or through Discord for help:

Just ask
New users often make the mistake of asking "Is anyone in here?", which is typically ignored (because you already know there's someone there by viewing the list of people in the channel). Briefly explain your problem, and don't wait for permission to ask.
Don't expect immediate answers, but do hang around for a few hours, at least
People live in different timezones, and don't always watch their chat window. It is considered impolite to ask a question, and then disconnect after a short while if there was no answer.
Try to ask specifically
The guidelines on ReportingErrors still apply, although the nature of IRC means you have to condense your questions, and the direct feedback means you can discuss this in dialog.
Groups of people are chaotic; so are chat rooms, at times
It often happens that discussions go off on a tangent, and suddenly a lot of people participate in discussions that can range from philosophical, across absurd to highly technical. This is just how such chats works. Don't be afraid to participate. Of course, you might not be getting the answer you want because of those discussions, but there's a high chance that people will still have noticed you.
If you wouldn't say it in a polite personal context
Don't say it.
Of course, any rude or inappropriate behaviour is met by a ban. We want this to be a friendly place. Sarcasm can sometimes be hard to understand across language and cultural barriers, and without seeing the other; be respectful and patient with each other.
If in doubt about what is not in order, see our Code of Conduct.