Has anyone experienced exaggerated dB signal reports given by WSJT-X to decoded FT8 signals of stations transmitting tone frequencies below 500 Hz? I use a K3 with 2.8 KHz filter using WSJT-X Version 2.5.0 . I have also seen this in earlier versions.
When stations using low audio tones are decoded, the signal levels that WSJT-X gives them far exceeds the levels given to signals with higher frequency tones of equal intensity level observed visually on the wide graph. I have run the “Measure Reference Spectrum” tool on a quiet frequency and have the “Ref Spec” checkbox on the Wide Graph checked. This didn’t resolve the noted anomaly. I first observed this on Foxes running 3 or 4 streams using tones below 500 Hz with the lower tones appearing a few DB stronger than the higher tones. Any idea as to why this may be happening. 73, Rich – K1HTV
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