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ew8bakandClaude Opus 4.8
42610b304e
Click the beacon on the spectrum; the controller tracks it and continuously trims the transverter LO so the whole downlink stays put as the LNB drifts. - BeaconLock.pas: TBeaconTracker scaffold (narrowband NCO/FLL) — kept but no longer in the control path (FLL diverged on the suppressed-carrier BPSK beacon + Pluto DC offset). Measurement now uses the proven display-FFT path. - RadioController: FBeaconLockHz folded into XvtrTranslate (on top of LOError). MeasureBeaconFFT finds the beacon by POWER-WEIGHTED CENTROID of the lobe (BPSK has a suppressed carrier → broad symmetric ~2.4 kHz lobe, not a line; a peak-finder jitters, the centroid sits on the carrier). Track position in ABSOLUTE display Hz (FBeaconTrackHz) so scrolling the waterfall/centre never moves the search window off the beacon. Closed loop: e = tracked - ref, d(e)/d(LockHz) = -1 -> LockHz += gain*e; settle cooldown after each correction (display-FFT lags the LO retune -> avoids overshoot); deadband 75 Hz + centroid/prominence smoothing + lock hysteresis for a steady lock. Correction applied only after the user clicks (manual seed), so a crowded band can't pull a neighbour to the reference. - WDSPEngine: SetBeaconTracker + RX-IQ tap (tracker idle now, ~1 check/sample). - SpectrumView + GL: beacon markers — green = reference (10489.750), orange = tracked centroid. - MainForm: BEACON button (RX block, XVTR-only). Flow: BEACON -> "CLICK BCN" -> click beacon -> "L<corr> /<prom>". ServiceBeaconLock driven by MeterTimer. Reference defaults to the middle BPSK beacon 10489.750. Tested on-air against Es'hail-2: locks and holds, survives waterfall drag. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>