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FSK PWM, byte-reversed 40-bit frame, 8-bit additive checksum. Verified against 4 real captures in issue #2942: all match the reference table exactly (id, temperature_raw, humidity_raw). Reports raw 12-bit counts only -- engineering-unit calibration is transmitter-specific and lives in the Hanwell base station, not the radio protocol. The real 40-bit frame is always the last demodulated row (earlier rows are leftover preamble noise). Ships disabled: the one working capture needs non-default -Y demod-assist flags to lock on at all.