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I would also like to point out another technicality about the OFDM modes in FLDigi in general. They technically are just multi-carrier modes, not OFDM. OFDM means that the spacing of the carriers is such that the center frequency of each carrier is located at the zero points (nulls) of each adjacent carrier. This produces a spectrum with a flat top. However, in FLDigi, the so-called OFDM modes are such that the zero points (nulls) of each carrier are located at the nulls of the adjacent carriers. So this makes them actually not true OFDM modes. Please fix this. You could get higher data throughput (or at least reduce the bandwidth) if you were to cut the carrier spacing in half, so that they were true OFDM modes where each carrier was located at the null of the adjacent carriers.