Measured SNR Waterfall Thresholds
The following table summarizes approximate SNR breakpoints observed in representative coastal environments where packet error rate increases sharply.
| Mode | SNR (dB) | Observed Behavior |
|---|---|---|
FH_80bps | -5 | Maintains lock at very low SNR |
BPSK_640bps | 2 | Strongest coherent mode |
BPSK_960bps | 2.5-3 | High redundancy |
BPSK_1280bps | approximately 3 | Medium/long range |
BPSK_2560bps | 3 | Baseline coded BPSK |
QPSK_1280bps | approximately 4 | Backward compatible only |
QPSK_1920bps | 4.5-5 | Backward compatible only |
QPSK_2560bps | 5-6 | Backward compatible only |
QPSK_5120bps | 5 | Recommended coded QPSK |
QPSK_10240bps | 10 | Uncoded; short-range only |