Title: Frequency Analyzer
Description: Visualize signal strength across SubGHz bands to find active frequencies
URL: /v2.1/subghz/freq-analyzer/
Version: v2.1
Section: SubGHz
Search index: /search-index.json

# Frequency Analyzer

> Visualize signal strength across SubGHz bands to find active frequencies

## On this page

- [Use cases](#use-cases)
- [Using the Frequency Analyzer](#using-the-frequency-analyzer)
- [On-device UI](#on-device-ui)
- [Command line](#command-line)
- [Band visualization](#band-visualization)
- [Signal detection workflow](#signal-detection-workflow)
- [Tips](#tips)
- [Notes](#notes)
- [Troubleshooting](#troubleshooting)

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The Frequency Analyzer scans across all supported SubGHz bands to visualize signal activity and help identify the frequency used by target devices.
## Use cases
- Unknown frequency: When you don’t know which band a device uses
- Multi-band environments: Areas with devices on different frequencies
- Signal hunting: Locating active transmitters in the area
- Verification: Confirming a device’s transmission frequency before capture
## Using the Frequency Analyzer
### On-device UI
- Open Menu → SubGHz → Freq Analyzer.
- The device will scan across all five bands (315, 390, 433.92, 868.35, 915 MHz).
- Signal strength is displayed as bar graphs for each band.
- The analyzer updates in real-time to show current activity.
- Press Back to stop the analyzer.
### Command line
The Frequency Analyzer is primarily a UI tool. Use the standard scanner with frequency cycling for CLI-based frequency detection:
# Start scanner
subghz start
# Cycle through frequencies while watching signal strength
subghz cycle_freq
## Band visualization
The analyzer displays five bands, each showing signal strength levels:
- 315 - North American garage doors and remotes
- 390 - Security systems and remote controls
- 433 - Most common worldwide (garage doors, gates, sensors)
- 868 - European remotes and alarm systems
- 915 - North America ISM band devices
Higher bars indicate stronger signals on that band.
## Signal detection workflow
- Start the analyzer and let it run for 30-60 seconds to establish a baseline.
- Activate the target device (press the remote button, trigger the sensor, etc.).
- Watch for spikes in the band visualization when the device transmits.
- Note the active band - this is the frequency to use for capture.
- Switch to the scanner on that band for detailed signal analysis.
## Tips
- Environment matters: Background noise from other devices can create false positives. Test in a quiet RF environment if possible.
- Distance: Start closer to the target device for clearer signal detection.
- Multiple activations: Some devices transmit intermittently; activate the target multiple times while watching the analyzer.
- Baseline comparison: Note the baseline noise levels before activating the target to distinguish its signal from background.
## Notes
- The Frequency Analyzer provides a quick overview but is less precise than the detailed 64-channel scanner.
- For precise frequency identification within a band, use the scanner on that band.
- Some devices transmit very briefly; you may need to activate them repeatedly to see the signal.
## Troubleshooting
- No bands show activity: Ensure the target device is transmitting. Check antenna connection. Try moving closer to the device.
- All bands show high activity: You may be in an area with high RF interference. Try moving to a different location or testing at a different time.
- Unclear which band is the target: Activate the device multiple times and watch for consistent spikes on a specific band.