# fulldecent/system-bus-radio

Transmits AM radio on computers without radio transmitting hardware.

Repository: https://github.com/fulldecent/system-bus-radio
Canonical: https://ross.abutalabs.com/products/system-bus-radio
Homepage: https://fulldecent.github.io/system-bus-radio/
Language: C
License: MIT
License Family: permissive
Topics: radio, equipment, software-defined-radio, exfiltration, security, transmission, transmitter, airgap, low-level, radiation, communication, communication-protocol, electrical-engineering, engineering, microprocessor
Last push: 2026-03-18T14:20:54+00:00

## Health v2 (maintenance only)
Score: 55/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 72, release rhythm 8, longevity 100
- inputs: {"age_days": 3838, "days_push": 168, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6697, forks 404 (observed 2026-08-28T04:09:47.865729+00:00)

## What it is
A C program that transmits AM radio signals from computers and phones that lack radio transmitting hardware by generating precisely timed electromagnetic emissions from the processor. It demonstrates TEMPEST-style air-gap exfiltration and includes a browser-based demo and tune file format.

## Use cases
- transmit AM radio from a computer without radio hardware
- demonstrate air-gap exfiltration via electromagnetic emissions
- test TEMPEST-style leakage from secured systems
- play tunes over an AM radio receiver using CPU emissions
- receive computer bus signals with RTL SDR hardware
- study electromagnetic radiation from microprocessors

## When to choose
- researching or demonstrating air-gap exfiltration and TEMPEST concepts
- testing electromagnetic leakage of embedded systems like Raspberry Pi
- educational demonstrations of low-level hardware emissions

## When to avoid
- you need reliable or long-range radio communication
- you need a compliant, licensed radio transmitter
- you need production data exfiltration tooling with real throughput

## Facets
- artifact type: application
- maturity: maintenance
- function: security, cryptography, embedded
- domain: security, hardware, embedded-systems
- platform: cross-platform, browser
- tags: tempest, air-gap, radio-transmission, electromagnetic-emission, exfiltration, sdr, macos, linux

## Member repositories
- fulldecent/system-bus-radio (main) score 55

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:47.865729+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 2026-08-29T17:42:58.635578+00:00, confidence not recorded.
  - readme: https://github.com/fulldecent/system-bus-radio (fetched 2026-08-28T04:09:47.865729+00:00, sha 56ef603d7b76)
  - homepage: https://fulldecent.github.io/system-bus-radio/ (fetched 2026-08-29T08:39:02.773480+00:00, sha 9317947cad31)
- Data as of 2026-08-30T08:39:29.467469+00:00.