| Decoder | Best For | Weak Signal | Bad Fist | Speed Range | |---------|----------|-------------|----------|--------------| | MRP40 | Noisy/weak signals | Excellent | Very Good | 5–40+ WPM | | CW Skimmer | Bandscan/panoramic | Good | Poor | 10–50 WPM | | Fldigi (CW) | Free, cross-platform | Moderate | Moderate | 5–35 WPM | | FLDIGI + ML | Experimental | Good | Moderate | 5–40 WPM |
While MRP40 advertises 5-100 WPM capability, our verified testing found that above 45 WPM, it starts hallucinating. It will decode "CQ CQ CQ" as "SKSK SK." For contesting at 60 WPM, feed the raw audio to CW Skimmer instead. mrp40 morse code decoder verified
We used a recording of an actual 70-year-old operator whose dit-to-dah ratio was 1:2 (instead of the standard 1:3). | Decoder | Best For | Weak Signal
Verified Verdict: For decoding historical QSOs or rag-chews with poor keying, MRP40 remains unverified by modern standard? No—it is verified to work where others fail. Verified Verdict: For decoding historical QSOs or rag-chews
| Feature | Description | |---------|-------------| | Neural Network Decoding | Adapts to individual fist characteristics (speed, weighting, spacing). | | Speed Range | 5 to 40+ WPM (reliably decodes up to 50 WPM in tests). | | Noise Handling | Superior performance in QRM, QRN, and fading conditions. | | Automatic Speed Tracking | Follows senders who change speed mid-transmission. | | Input Sources | Line-in (sound card), microphone, or recorded WAV files. | | Waterfall Display | Visual spectrum view of CW signals. | | Text Output | Decodes to on-screen text; can log to file. | | Tuning Indicator | Helps center the frequency on the CW signal. |
We tested MRP40 v.6.9.2 (the latest stable build) against three competing decoders: