multimon-ng

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1. 1.6.0 Jul 27, 2026 · issue 027

   multimon-ng 1.6.0 adds GSC paging, FLEX/POCSAG generation, macOS audio capture, SDL3 scope, and JSON output for GSC and FLEX_NEXT.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 1.6.0 https://github.com/EliasOenal/multimon-ng.git
   # already have the repo? check out this version:
   $ git checkout 1.6.0

   └──▷ TRY IT
   Decode a live RTLRTLRegister Transfer Level, a hardware design abstraction describing how data moves between registers each clock cycle; cyber tools use it to analyze or synthesize digital circuits from HDL source.-SDR feed for GSC paging traffic alongside FLEX_NEXT, capturing both with JSON-structured outputstructured outputForcing a model's response to match a given format or JSON schema, so software can parse it reliably instead of hoping the text is well formed. for downstream parsing.
   copy

   $ rtl_fm -f 929612500 -s 22050 | multimon-ng -t raw -a GSC -a FLEX_NEXT /dev/stdin

   Generate a POCSAG test signal and a FLEX test signal using gen-ng to validate your receive chain or feed a decoder under test.
   copy

   $ gen-ng -P "Test page message" -A 1234567 -B 1200 -t raw - | multimon-ng -t raw -a POCSAG1200 -

   Replay a recorded FLAC capture through FLEX_NEXT with automatic input format detection to extract reassembled multi-frame messages with timestamps.
   copy

   $ flac -d --stdout ~/recordings/rtlfm.1725033204.flac | multimon-ng -r -v 0 -a FLEX_NEXT -t flac -

   • Adds GSC (Golay Sequential Code) paging decoder with error correction, auto-polarity, batch message support, and JSON output.
   • Adds FLEX_NEXT decoder improvements based on ARIB STD-43A: more robust decoding, message reassembly, validation, timestamps, and JSON output.
   • Adds FLEX and POCSAG signal generation via the new gen-ng binary.
   • Adds native macOS audio capture support.
   • Adds automatic input format detection.

   +2 more show less

   • Adds optional SDL3 digital phosphor oscilloscope (SDL_SCOPE mode).
   • Improves POCSAG polarity detection, BCH error correction, charset support, and malformed-message handling.

   7 details in Everything

2. 1.4.0 Feb 19, 2025 · release notes

   multimon-ng 1.4.0 adds partial JSON output, UTC ISOISOA widely adopted international standards body that publishes technical specifications; cyber tools cite ISO standards to signal compliance with recognized benchmarks for quality, security, or interoperability.-8601 timestamps, and FLEX offset estimation.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 1.4.0 https://github.com/EliasOenal/multimon-ng.git
   # already have the repo? check out this version:
   $ git checkout 1.4.0

   └──▷ TRY IT
   Suppress per-message timestamps in FLEX output when your log aggregator adds its own timestamps, reducing noise.
   copy

   $ rtl_fm -f 929.0125M -s 22050 | multimon-ng -t raw -a FLEX --flex-no-ts -

   • Adds partial JSON output mode for structured, machine-readable decoding results.
   • Adds UTC ISO-8601 timestamp mode for consistent, timezone-unambiguous logging.
   • Adds --flex-no-ts flag to suppress timestamps in FLEX decoder output.
   • FLEX decoder now estimates total offset based on estimated elapsed full cycles.

   4 details in Everything

3. 1.1.9 Sep 21, 2020 · release notes

   multimon-ng 1.1.9 adds a man page, FLEX group message support, and Slovenian POCSAG charset

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 1.1.9 https://github.com/EliasOenal/multimon-ng.git
   # already have the repo? check out this version:
   $ git checkout 1.1.9

   • Adds FLEX decoding support for changes to group messages and delimiters

   1 detail in Everything

4. 1.1.8 Jul 2, 2019 · release notes

   multimon-ng 1.1.8 adds POCSAG Swedish charset support, FLEX numeric spacing, and DTMF false positive filtering.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 1.1.8 https://github.com/EliasOenal/multimon-ng.git
   # already have the repo? check out this version:
   $ git checkout 1.1.8

   └──▷ TRY IT
   Decode POCSAG messages using the new Swedish charset and explicit standard-compliant type detection.
   copy

   $ multimon-ng -a POCSAG -f auto input.raw

   • Adds POCSAG support for the Swedish charset and changes default message type detection to follow the POCSAG standard (use -f auto for old heuristic behavior)
   • Improves DTMF decoding by filtering false positives
   • Fixes Windows stdin binary mode to correctly support piping on Windows

   3 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !The default POCSAG message type detection behavior has changed from heuristic to standard-based; users relying on the old behavior must now explicitly use -f auto.