Native. Open. Yours.

Welcome to the AetherSDR documentation. AetherSDR is an open-source, Linux-native client for FlexRadio Systems transceivers, with macOS and Windows builds available as a courtesy.

• Installation — Download and install on Linux, macOS, or Windows
• First Connection — Connect to your FlexRadio for the first time
• Building from Source — Compile AetherSDR yourself

• Panadapter Controls — FFT spectrum, waterfall, zoom, pan, display settings
• VFO Widget — Frequency display, sub-menus, slice management
• RX Controls — Filters, DSP, AGC, squelch, RIT/XIT
• TX Controls — Power, profiles, ATU, MOX, TUNE, APD, Quindar tones
• Aetherial Audio — Client-side TX and RX audio DSP suite (gate, EQ, de-esser, compressor, tube, PUDU, Final Output, Waveform; reverb on TX)
• Multi-Slice Operation — Working with multiple VFOs
• Diversity and ESC — Diversity mode and Equalizer-Selectable Combining
• TNF (Tracking Notch Filters) — Creating and managing notch filters
• Memory Channels — Saving, recalling, and editing radio memory channels
• Profile Management — Global, TX, and Mic profiles
• Slice Colors — Per-slice colour-coding for VFOs, panadapter overlays, and meters
• XVTR (Transverters) — Transverter setup and operation

• CWX Panel — Keyboard-to-CW keying panel (CW/CWL modes)
• CW Decoder — Real-time Morse decode with confidence colouring
• DVK Panel — Digital Voice Keyer: 12-slot recording/playback for contesting (voice modes)
• RTTY Operation — Mark/Space lines, shift settings, external software setup
• RADE Digital Voice — FreeDV AI-based digital voice codec
• DAX Virtual Audio — Virtual audio devices for digital mode apps (WSJT-X, VARA, fldigi)
• DAX IQ Streaming — Raw I/Q streaming to SDR apps at 24/48/96/192 kHz
• WSJT-X Integration — FT8/FT4 with rigctld CAT control and DAX audio
• CAT Control — Hamlib rigctld TCP and virtual serial ports
• TCI Server — TCI v2.0 protocol over WebSocket: CAT + audio + IQ + CW + spots

• SpotHub — Unified spot manager (DX Cluster, RBN, WSJT-X, POTA, FreeDV Reporter, Memories, Signal-History markers)

• AetherSweep — In-panadapter SWR analyzer with log scale and threshold-band shading
• ShackSwitch — Network-controlled antenna / accessory switch integration

• StreamDeck — Elgato Stream Deck plugin (cross-platform)
• FlexControl Tuning Knob — USB tuning knob with acceleration and configurable buttons
• MIDI Controller Mapping — Map any MIDI controller to 50+ radio parameters with Learn mode
• MQTT Station Automation — Subscribe/publish to control rotators, antenna switches, and Node-RED flows
• TGXL Tuner Control — 4o3a Tuner Genius XL relay control, autotune, 3×1 antenna switch
• USB Cable Management — Configure CAT, BCD, Bit, and Passthrough cables on the radio's USB ports

• SmartLink Setup — Operate your radio over the internet
• Manual Connection — Connect across routed networks without SmartLink
• Low Bandwidth Connections — Reduce traffic for VPN, LTE, and metered links

• Radio Setup — All settings tabs
• Audio Settings — Line out, headphone, PC audio devices
• Firmware Update — Update radio firmware from Linux

• GPU Rendering — QRhi waterfall + FFT spectrum on GPU (OpenGL/Metal/D3D11)
• DSP Noise Mitigation — Complete guide to all noise reduction features (NR2, RN2, NR4, MNR, BNR, DFNR)
• BNR GPU Noise Removal — NVIDIA Maxine setup for GPU AI denoising
• NR2 Noise Reduction — Client-side spectral noise reduction parameter reference
• Multi-Flex — Operating alongside SmartSDR or Maestro

• Support and Logging — Help → Support…, log categories, AI-assisted bug reports, the 💡 lightbulb
• Troubleshooting — Common issues and solutions

• Contributing Guide — How to contribute code and features
• AI-Assisted Development — Using Claude AI to contribute