# BatchDrake/SigDigger

Qt-based digital signal analyzer, using Suscan core and Sigutils DSP library

Repository: https://github.com/BatchDrake/SigDigger
Canonical: https://ross.abutalabs.com/products/sigdigger
Homepage: https://batchdrake.github.io/SigDigger/
Language: C++
License: LGPL-3.0
License Family: copyleft
Topics: gqrx, digital-signal-analyzer, sdr, qt, soapysdr, linux, ask, psk, fsk
Last push: 2026-02-11T18:28:43+00:00

## Health v2 (maintenance only)
Score: 53/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 67, release rhythm 8, longevity 100
- inputs: {"age_days": 2577, "days_push": 203, "days_rel": 512, "gap_med": null, "n_releases_24m": 1}
- flags: prerelease_only
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2876, forks 305 (observed 2026-08-28T04:07:27.338077+00:00)

## What it is
SigDigger is a free Qt-based digital signal analyzer for analyzing unknown radio signals with software-defined radio devices via SoapySDR. It provides real-time spectrum analysis, waterfall display, adjustable demodulation of FSK/PSK/ASK signals, analog voice listening, and baseband recording using its own Sigutils DSP library and Suscan analysis core.

## Use cases
- analyze unknown radio signals from an SDR dongle
- demodulate FSK PSK and ASK signals in real time
- view spectrum and waterfall of RF signals
- record baseband IQ data for offline replay analysis
- listen to analog voice channels like AM FM SSB
- decode analog video from radio signals
- analyze bursty transmissions and capture symbols

## When to choose
- you want a free GUI alternative to Gqrx with deeper signal inspection features
- you need to reverse-engineer unknown digital signals with adjustable demodulators
- you use SoapySDR-compatible SDR hardware on Linux, macOS or Windows
- you want real-time analysis without depending on GNU Radio

## When to avoid
- you need a scriptable or headless DSP pipeline rather than a GUI tool
- you want GNU Radio flowgraph-based processing or its ecosystem of blocks
- you need production-grade signal intelligence workflows with certified accuracy
- you require support for non-x86-64 architectures, which is still in progress

## Facets
- artifact type: application
- maturity: active
- function: gui, audio-processing, image-processing, plugin-system
- domain: embedded-systems, developer-tools
- platform: windows, cpp
- tags: sdr, dsp, radio-signal-analysis, soapysdr, demodulation, spectrum-analyzer, qt, ham-radio, signal-decoding, real-time, linux, macos, desktop

## Member repositories
- BatchDrake/SigDigger (main) score 53

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:27.338077+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:35:41.827961+00:00, confidence not recorded.
  - readme: https://github.com/BatchDrake/SigDigger (fetched 2026-08-28T04:07:27.338077+00:00, sha 68a9f75224b9)
  - homepage: https://batchdrake.github.io/SigDigger/ (fetched 2026-08-29T09:51:12.943751+00:00, sha 8ac816b2ad5d)
- Data as of 2026-08-30T08:39:29.467469+00:00.