> alright to let the > transmitter ALC line operate on PSK31. It has been my experience that when ALC action is allowed for PSK31, the IMD reading will get significantly worse. Another danger that was discussed on FT-817 group was that there are sometimes fixed gain audio amplifiers in front of the ALC circuitry and increased audio drive (although taken care by the ALC circuits) will cause clipping in those fixed gain circuits.
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