Rimu Systems LLC
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Linux SDR Suite

Native Linux SDR for FlexRadio

RimuSDR includes integrated DAX and CAT components for a complete Linux SDR experience on modern desktops.

One RimuSDR suite with integrated DAX and CAT components

Download RimuSDR Installation Guide

FlexRadio 6000, 8000, and Aurora series · Linux-native · $49 one-time license · Free trial included

RimuSDR SDR Client

What attracts me to RimuSDR when compared to other options available on Linux is the cleanness and tidy interface and the close similarity to SmartSDR.

What is especially of great value to me is the option to run RimuDAX and RimuCAT separately from RimuSDR giving me the option to use a Flex Maestro or other hosted control app to tune the radio and still have access to the audio and CAT controls on the Linux machine to support signal decoding apps.

Ray, G6UJB

Included Components

RimuSDR brings together the core SDR client with integrated DAX and CAT capabilities for Linux.

RimuSDR

RimuSDR

The core SDR client for Linux and the center of the integrated RimuSDR suite.

  • Panadapter and waterfall display
  • Complete radio control interface
  • multiFLEX and SmartLink support
  • Integrated CWX keyer
  • Supports FlexRadio 6000, 8000, and Aurora series
  • Native Linux client experience
Learn more about RimuSDR
RimuDAX

RimuDAX

The integrated audio component for digital modes and signal-analysis workflows.

  • Virtual audio channels for Linux
  • Processed audio for FT8, PSK31, RTTY, and similar modes
  • Raw I/Q streams for CW Skimmer and SDR-Bridge
  • Built into the RimuSDR suite
See RimuSDR details and screenshots
RimuCAT

RimuCAT

The integrated control component for CAT-compatible logging and radio software.

  • Virtual serial port interface for legacy radio software
  • Lets traditional ham applications read and control your FlexRadio
  • Bridges network-based Flex architecture to CAT workflows
  • Built into the RimuSDR suite
See RimuSDR details and screenshots

Simple, One-Time Pricing

RimuSDR is a $49.00 one-time purchase that includes the integrated RimuDAX and RimuCAT components and all version 1.x updates. Every download includes a free trial mode, limited to 80m receive-only with transmit disabled, so you can evaluate RimuSDR with your own radio before buying.

Buy a License - $49 Download Free Trial

Get Started with RimuSDR

Download, install, and activate RimuSDR in three simple steps.

1. Download
Choose the package that matches your system: Debian/Ubuntu packages, Raspberry Pi builds, or AppImage.
2. Install
Install the .deb package or run the AppImage. Full installation instructions provided for each platform.
3. Activate
Enter your license code and callsign in Help → Activate License to start using RimuSDR.

Why Linux?

Six practical reasons Linux is becoming a smarter choice for everyday desktop computing.

A Growing Desktop Shift
More individuals and organizations are re-evaluating Linux as converging trends make it an increasingly practical desktop platform.
Cost-Effective and Future-Proof
Linux is free to use and upgrade, helping extend the life of existing hardware without licensing costs or forced replacement cycles.
A Better Path for Older Hardware
Many systems blocked from Windows 11 can still run Linux efficiently, including older PCs that remain fully capable and serviceable.
The End of Windows 10 Support
As Windows 10 support ends and vendor compatibility narrows, Linux offers a secure, supported path that does not require new hardware.
A Cleaner Experience
Linux provides a more streamlined, privacy-respecting environment without built-in promotions, forced cloud integration, or setup friction.
Modern, Polished Desktops
Cinnamon, KDE Plasma, and GNOME deliver stable, refined desktop experiences with familiar workflows and much greater control.

Tested Environments

RimuSDR has been tested across current Debian, Ubuntu, and Fedora family distributions on x86_64, with ARM 64 validation currently focused on Raspberry Pi platforms.

AppImage builds are also provided for other Linux distributions, offering a portable way to run RimuSDR without distro-specific packaging, though those environments are not all tested to the same extent.

Distribution .deb RPM AppImage
Ubuntu 26.04 LTS x86_64 OK N/A OK*
Ubuntu 24.04.4 LTS x86_64 OK N/A OK
Linux Mint 22.2 x86_64 OK N/A OK
Debian 13 x86_64 OK N/A OK
Zorin OS 18 Core x86_64 OK N/A OK
Pop!_OS 24.04 x86_64 OK N/A OK
Fedora 43 / 44 x86_64 N/A OK —
Rocky Linux 9 / 10 x86_64 N/A EXP —
MX Linux x86_64 — N/A OK
Kubuntu x86_64 — N/A OK
Manjaro x86_64 — N/A OK
Raspberry Pi 4B / 5 ARM64 OK N/A N/A
Ubuntu 24.04.4 LTS ARM64 N/A N/A EXP

OK = tested · EXP = experimental · — = not yet tested · N/A = not applicable

* Requires an additional package: sudo apt install libopengl0 - this will be bundled in a future release.

RimuSDR Packaging Options

RimuSDR is available as native packages for supported Ubuntu, Debian, Fedora, Rocky Linux, and Raspberry Pi systems, with AppImage builds provided as a portable option for other Linux distributions. A Windows installer is also available for evaluating the interface.

Debian/Ubuntu (.deb) - amd64 Fedora/Rocky (RPM) - x86_64 Raspberry Pi - ARM64 AppImage - x86_64 AppImage - aarch64 Windows Installer - amd64
Download options
- Linux amd64/x86_64 or arm64
- Native packages for tested Ubuntu, Debian, and Fedora systems
- RPM packages for Fedora and Rocky Linux
- Raspberry Pi 4B and Pi 5 builds
- AppImage for portable use on other Linux distributions
- Windows installer for evaluation
- Modern GPU recommended
- FlexRadio 6000 / 8000 / Aurora series

Hardware Requirements

Minimum and recommended hardware for running RimuSDR in a typical station environment.

Minimum Hardware Requirements
  • CPUx86_64 (Intel/AMD) or ARM64/aarch64 processor, dual-core 1.5 GHz or faster
  • RAM2 GB minimum
  • Disk Space500 MB
  • NetworkEthernet or WiFi with stable low-latency connection
  • Display1366×768 minimum resolution
Recommended for Typical Station Use

RimuSDR itself is not resource-intensive, but most operators run it alongside digital mode software (WSJT-X, FLDigi), logging programs, and skimmers. These recommended specs reflect that real-world workload.

  • CPUQuad-core 2.0 GHz or faster (Intel i5/i7, AMD Ryzen 5 or better)
  • RAM8 GB or more
  • DiskSSD with at least 1 GB free space
  • NetworkWired Ethernet strongly recommended; WiFi may introduce latency in radio command response
  • Display1920×1080 or higher; ultrawide or dual monitors beneficial for spectrum and waterfall displays
Notes
  • Raspberry Pi 4 (ARM64, quad-core 1.5–1.8 GHz, 4–8 GB RAM) meets the minimum requirements and is a supported platform.
  • On slower hardware, reducing panadapter FPS and FFT resolution in the display settings will significantly reduce CPU and network load.
  • The primary performance bottleneck in a typical shack is not RimuSDR but the combination of all running software together.

Resources & Support

Everything you need to install, configure, and operate the RimuSDR suite.

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