Radio Sound card

For HF decoders at the capture rate, not for megahertz of bandwidth.

New in 0.2.6, not in 0.2.5.

What it is for

In the radio list choose Sound card: ... (including Default input). Typical uses: a WebSDR, a virtual audio cable (VAC), or a handheld radio's speaker or line output into the computer, for HF decoders (FT8, RTTY, CW, SSB) at the capture rate (usually 48 kHz). This is not a replacement for an SDR when you need megahertz of bandwidth.

Mappings

Mapping	Meaning
I/Q stereo	Left is I, right is Q.
USB audio	Upper-sideband audio (analytic signal).
LSB audio	Lower-sideband audio.
Mono real	A single real signal.

The frequency field is the dial the decoder should assume; nothing is tuned and there is no gain or antenna power. The microphone or input is not opened until you press Start. This was not verified against a real WebSDR.

On macOS the audio path is CoreAudio, elsewhere miniaudio.