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Section 3 digital modes
sdroxide has several families of digital mode. What they all share — how a mode is entered, the calling-frequency buttons, and the bands with more than one agreed frequency — is in 3.1. FT8, FT4 and FT2 are automatic, timeslot-based modes with QSO sequencing, a world map, and automatic logging; they and the logbook they write into — which also serves every other mode and your manual QSOs — are 3.2. PSK31, RTTY, Olivia, THOR and FSQ are live keyboard modes: you tune onto a signal, read the decoded text, and type a reply that transmits as you go (3.3–3.4). Hellschreiber is a facsimile mode with no decoder at all — it paints letters onto a scrolling strip and you read them by eye (3.5). SSTV is an image mode: received pictures build up in a gallery and you transmit composed images (3.6). RIFP carries pictures as numbered, checksummed packets over its own FSK modem rather than as an analogue scan, and is the one mode here that is not single sideband (3.7). Weather fax receives the charts the meteorological services broadcast on short wave, and transmits nothing (3.8). JS8 uses FT8's waveform but carries a conversation instead of a contest exchange (3.9). RF Paint is a transmit-only mode that draws text and pictures directly onto the far station's waterfall (3.10). WSPR is not a QSO mode at all — it is a beacon that measures propagation, and what it produces is a list of paths rather than contacts (3.11).
From the User Manual. Home.