FGCom-mumble simulates radio communication based on the VoIP software Mumble. It integrates fully with the radio stack of your FlightGear plane, allowing you to communicate with other pilots and airspace controllers during your flight. It simulates a global, continuous radio frequency spectrum.
FGCom-mumble leverages the plugin mechanism introduced by Mumble 1.4.0 and just needs a precompiled plugin loaded by a stock Mumble client. You can download the latest release from https://github.com/hbeni/fgcom-mumble/releases.
|Caution The plugin relies on the Mumble 1.4.0 development version, which is not yet released.|
|Note This is currently in development and has no stable release for productive use yet. Expect lots of bugs! But please, help testing if you can; and report those bugs.|
|Developed by||Benedikt Hallinger|
|Initial release||0.1.0-alpha (08.06.2020)|
|Latest release||see release page|
|Written in||C++, Lua, Java, PHP|
|OS||Windows, GNU/Linux, MacOS|
|License||GNU General Public License v3|
- The main FGCom-mumble test server is
- The status page for that service showing all connected clients is at: http://fgcom.hallinger.org/
Project main goals
- Provide communication with geographic and channel separation
- Provide a realistic radio simulation
- Ease of use for the end user/pilot
- Arbitrary frequency support
- ATIS recording and playback
- Radio station broadcast support
- Landline/Intercom support
- RDF detection for clients
- Ease of server side installation and operation
- Standalone nature (no dependency on FlightGear)
- Capability to be integrated into FlightGear, with the option to support third party applications (ATC, but also other flight simulators)
- Modularity, so individual component implementations can be switched and its easy to add features
- Good and complete documentation
Installation and setup
The provided README has detailed instructions on the needed prerequisites and installation procedures.
- Have a stock Mumble client >= 1.4.0 running, and load the plugin (mumble settings/plugins page)
- Join a channel named `fgcom-mumble`
- Add the `fgfs-addon` folder of the client release as FlightGear Addon in your launcher
- Start FlightGear and use your plane's radio stack (it uses default FGCom buttons, see below)
FlightGear's FGCom-mumble protocol uses the default FGCom buttons: When you want to talk on COM1 you have to press Space. While transmitting you can not hear other pilots trough the used radio (they are half-duplex). You can also talk on COM2 by pressing ⇧ Shift+Space. For COM3 you need to define a custom keybind, or use the COMBar (open from Menu/Multiplayer/FGCom-mumble).
If you want to try it out without FlightGear, you can also start the supplied RadioGUI.
How to test your setup?
First, make sure Mumble is working reliably by talking to other people. Either disable the plugin, or be sure you are outside any radio channel (starting with `fgcom-mumble`).
The plugin alters Mumble's receiving audio stream. It adds static noise depending on the radio signal quality, or cancels out all audio when not in range.
If the server supports it (in essence there is a bot-manager running and a `fgcom-recorder-bot` listening) you may do a traditional echo test by tuning `910.00` and start to talk. The radio bot will record that and spawn an echo bot at your position, replaying your message.
For troubleshooting, refer to the projects README as it has further suggestions.
FGCom-mumble supports the legacy FGCom UDP protocol and thus should be compatible to clients supporting that. However, it also features some new UDP fields.
- FlightGear is supported through an FlightGear addon. This assumes the default radio implementation and works with at least the C172P and the C182S.
- ATC-pie has built in support already (be sure to activate "FGCom-mumble" instead of just "FGCom" in the settings).
- OpenRadar currently supports just COM1 (ticket pending). To use COM2 and more, you need to either start several mumble instances, or use FGCom-mumble's RadioGUI.
- There is a patched version of OpenRadar with FGCom-mumble and 8.33 channel tuning support available here: http://fgcom.hallinger.org/OpenRadar_fgcom-mumble.jar
- The UFO aircraft rebinds Space so you can't transmit on the radio.
The FGCom-mumble RadioGUI is a small Java 8 application that can send the FGCom-mumble UDP messages to the Mumble plugin.
Inside the GUI, you can pick your location from a map and then setup and use your radio stack.
By design, all that is needed is a standard Murmur server (version 1.4.0 or later) and a specially named channel (it has to start with `fgcom-mumble`). This is enough to let the plugin do its work. The entire channel is treated as a single, worldwide continuous radio frequency spectrum.
Additional features are implemented using server side Lua bots (which may run somewhere else):
- ATIS recording and broadcasting
- Radio program broadcasting (OGG playback on a frequency), Custom NDB beacons
- Status page data collection
A status page showing client details is available as a PHP website, that gets its data fed from the fgcom-status-bot.
Detailed installation and operation documentation is shipped with the releases, but is also online.
- FGCom-mumble GitHub wiki with hints etc
- The has development discussions and release announcements
- and - Compatibility and differences between FGCom, FGCom-mumble and Mumble
- FlightGear_Newsletter_June_2020: First prototype announced
- FlightGear_Newsletter_July_2020: Load tests successful, RDF implemented, Live-Status page added
- FlightGear_Newsletter_August_2020: More testing, new HF/VHF/UHF models, auto-updater
- FlightGear_Newsletter_September_2020: Mumble API changes, distributed deployment, configuration trough INI, statistics
- FlightGear_Newsletter_October_2020: More API changes, proper 8.33kHz/25kHz overlap, RadiGUI added
- FlightGear_Newsletter_November_2020: Test server announced
- FlightGear_Newsletter_December_2020: Release 0.8.0 bringing networking capability
- FlightGear_Newsletter_April_2021: RDF reworked, 0.12.0 announced, MacOS support
- FlightGear_Newsletter_May_2021: Better airliner support, announced 0.13.0 and 0.14.0, restructured release package structure
- FlightGear_Newsletter_June_2021: 0.14.1 announced, updater bugfixes
- FlightGear_Newsletter_July_2021: 0.14.2 announced, updater bugfixes part II