# SDR Scanner & Recorder

Monitors and records EU CB radio transmissions using an RTL-SDR dongle on a Raspberry Pi 400, powered by [RTLSDR-Airband](https://github.com/charlie-foxtrot/RTLSDR-Airband).

## Monitored Channels

| Channel | Frequency |
|---------|-----------|
| CB 3    | 26.985 MHz |
| CB 7    | 27.035 MHz |
| CB 10   | 27.075 MHz |
| CB 16   | 27.155 MHz |

## Architecture

Three Docker containers via `docker-compose`:

- **rtlsdr-airband** — multichannel SDR receiver, splits recordings per-transmission into dated directories
- **nginx** — web UI for browsing recordings on port 8080
- **cleanup** — periodically removes short/noise recordings (< 3KB)

## Usage

```sh
ssh user@your-pi
git clone gitea@git.michaelsmith.be:m/sdr-recorder.git
cd sdr-recorder
docker compose up -d
```

Recordings are saved to `~/recordings/` and browsable at `http://<hostname>:8080`.