== Heuristic Signal Profile ==
Family: dual-tone / 2-FSK / AFSK-like narrowband data
Confidence: medium
Analysis sample rate: 48000 Hz
Duration: 232.968 s
Active windows: 1796 / 21837
Detected bursts: 1

- Top dominant tones: 1750 Hz (50.3%), 2250 Hz (49.7%)
- Median occupied bandwidth: 173.6 Hz
- Median spectral flatness: 0.0000
- Estimated tone pair: 1750 / 2250 Hz
- Estimated shift: 500 Hz
- Observed tone-change rate: 37.53 changes/s
- Run length percentiles: p10=0.011s, p25=0.021s, p50=0.021s, p75=0.021s, p90=0.043s
- Tone shift is in the range often seen in utility/telemetry-style 2-FSK rather than classic 170 Hz RTTY.

Likely active ranges:
- 0.0-228.9 s

Interpretation:
- This looks like data/tone signalling, not normal voice audio.
- Audio-only WebSDR captures are often not enough to identify the exact protocol.
- Known decoders failing can mean unsupported, proprietary, or protected traffic; audio alone cannot distinguish those reliably.
- Raw symbol/state exports were generated for the dominant tone pair.