docs: 8852C quirks — the frame-free NHM floor is 2.4 GHz-only (fw DIG)#309
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… (fw DIG) New docs/8852c-quirks.md (styled after 8822e-quirks.md) documenting the Kestrel C8852C behavioural quirks beyond the _V1 bank moves. First entry: the active NHM absolute noise floor is 2.4 GHz-only. On 5 GHz it reads correctly for ~1.5 s after a channel tune, then the firmware DIG settles the CCK PD lower-bound (0x4b74[30]=0, no-link max sensitivity) and biases the NHM's dccl/CCA measurement reference ~24 dB high — not an RX gain change (the LNA/RXBB IGI registers stay constant; the per-packet physts RSSI is unaffected, so the passive floor stays accurate). devourer band-gates the NHM to 2.4 GHz; 5 GHz uses the passive rssi-snr floor. Includes the reproducer and the residual cost. Referenced from CLAUDE.md's Kestrel section. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
New
docs/8852c-quirks.md(styled afterdocs/8822e-quirks.md) for the Kestrel C8852C behavioural quirks beyond the_V1register-bank moves. First entry documents the fw-DIG NHM limitation, plus a one-line pointer from CLAUDE.md's Kestrel section.The entry
The active/frame-free NHM absolute noise floor (
DEVOURER_RX_NOISE_FLOOR→RxEnergy.abs_noise_floor_dbm) is 2.4 GHz-only on the 8852C:0x4b74[30]=0, no-link "max sensitivity") ~1.5–2 s post-tune, which biases the NHM's shared dccl/CCA measurement reference. It is not an RX gain change — the LNA/RXBB IGI registers stay constant, and the per-packet physts RSSI is unaffected (so the passive floor stays accurate on both bands).GetRxEnergyband-gates the NHM to 2.4 GHz + a −60…−105 plausibility guard; 5 GHz uses the passive rssi−snr floor.tests/kestrel_nhm_2g_onair.sh.Docs-only; current-state (no changelog/issue refs in the doc).
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