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Nexus puts the whole ham station in one modern app: FT8/FT4 with WSJT-X-grade sequencing plus Q65, FST4, FST4W, MSK144, JT65 and WSPR all transmitting, RTTY, SSTV, APRS, SSB/FM phone, and CW with a neural-net decoder.

The rig's own RF panadapter streams into the cockpit on native-CI-V Icom and FlexRadio. The waterfall pauses and rewinds. Route each band and mode to the radio that does it best, across up to three rigs. Awards (DXCC, WAS, WAZ, VUCC, IOTA) compute offline, and an eQSL or QRZ match never inflates an LoTW-grade award. Propagation uses a native ITU-R P.533 port and scores openings on receivers near you, not the global firehose.

APRS draws real station symbols, decodes weather reports, connects to APRS-IS, and runs a receive-only iGate. Speaks WSJT-X's UDP protocol byte-for-byte, so GridTracker and JTAlert keep working.

Its FT8/FT4 decode floor measures -21.3 dB against stock WSJT-X's -20.7 on identical audio.

Windows, Linux, Raspberry Pi. GPL-3.0, by KD9TAW.

Features

  • FT8/FT4 with WSJT-X-grade auto-sequencing and byte-for-byte UDP interop
  • Nine modes transmit: FT8, FT4, Q65, FST4, FST4W, MSK144, JT65, WSPR and Tempo
  • RTTY, SSTV, SSB/FM phone, and CW with a neural-net decoder
  • APRS with real station symbols, weather decoding, APRS-IS and a receive-only iGate
  • Real RF panadapter on native-CI-V Icom and FlexRadio; pause and rewind the waterfall
  • Route each band and mode to the right radio, across up to three rigs
  • Needed board with heard-by evidence, plus Pounce alerts on new entities
  • Awards computed offline (DXCC, WAS, WAZ, VUCC, IOTA) with source-aware confirmations
  • Propagation: native ITU-R P.533, operator-anchored openings, 3-D greyline globe
  • Zero-config 3-step rig setup, ~50 rigs curated, Hamlib bundled, license-class TX lockout
  • Satellites with rotor auto-track, DXpedition calendar, POTA/SOTA and Field Day
  • TempoFast and TempoDeep: original weak-signal modes with incremental-redundancy HARQ
  • Screen-reader accessible (JAWS/NVDA), always on. Windows, Linux and Raspberry Pi

Project Samples

NEXUS — the all-mode operations center CONNECT FT8 PHONE Journey Dxpedition

Project Activity

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Categories

Ham Radio

License

GNU General Public License version 3.0 (GPLv3)

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Nexus Ham Radio Web Site

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  • mm0abm3997 Edited 2026-08-07
    i love the software, been trying to use msk144, i take it it is now working correctly yet. tx good, can be decoaded from other software but not from nexus. look forward to any updates. Alex de mm0abm
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Additional Project Details

Operating Systems

Linux, Windows

Intended Audience

End Users/Desktop, Telecommunications Industry

Programming Language

Fortran, Rust

Related Categories

Fortran Ham Radio Software, Rust Ham Radio Software

Registered

2026-07-07
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