Feature

SmartSDR provides DAX (Digital Audio eXchange) virtual audio devices that allow digital mode software (WSJT-X, fldigi, JS8Call, FreeDV) to interface with the radio's audio streams.

Requirements

• Create PipeWire/PulseAudio virtual sink/source per DAX channel (1-4)
• Route DAX RX audio from radio to virtual source (apps read from it)
• Route DAX TX audio from virtual sink to radio (apps write to it)
• DAX IQ stream support for SDR apps (panadapter data as IQ) — tracked in DAX IQ streaming — raw I/Q data for SDR apps #124
• DAX channel assignment per slice
• Sample rate selection (24k, 48k, 96k, 192k for IQ) — tracked in DAX IQ streaming — raw I/Q data for SDR apps #124

Context

This is critical for digital mode operation on Linux. SmartSDR for Windows uses FlexVSP virtual serial ports and DAX virtual audio cables. On Linux, PipeWire virtual devices are the equivalent.

Related

• Issue Add pkgconf and cmake to macOS installation instructions #10 (FreeDV integration)
• Issue DAX IQ streaming — raw I/Q data for SDR apps #124 (DAX IQ streaming)
• Hamlib/rigctld interface needed for full digital mode support