•
calculate LBin and Ubin from magnify mode & frequency conversion &
filterpassband
•
rearrange data in sd.FFT_Samples (the buffer with the lowpass-filtered, scaled
complex magnitudes from the FFT)
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jump into UiSpectrum_CalculateSnap (Lbin, Ubin, posbin, bin_BW)
•
search for max magnitude value inside the passband (between Lbin and Ubin)
•
maxbin is the bin number of the bin with that max magnitude
•
calculate offset to Rx frequency depending on ts.cw_lsb (CW-L or CW-U)
•
delta1 is first offset in steps of bin_BW
•
delta2 is second offset determined by quadratic interpolation of the three bins
maxbin-1, maxbin and 1 (delta2 is always < bin_BW !)
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delta = delta2
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CW-L: delta = delta + cw_sidetone_freq;
•
CW-U: delta = delta - cw_sidetone_freq;
•
jump to UiSpectrum_CWSnapDisplay (delta)
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clamp data for display (display is +-140Hz at the moment)
•
draw yellow indicator with accuracy of 5Hz/pixel
•
done
