I can see the opposite possibility in this data. Looks like below 300 the
levels are low, high from about 300-400, then pretty consistent Red line here
is 50-point moving average of 5000 points. Above 2200 we're getting into the
region where bandpass limits might have an effect of some sort (lack of noise
or perhaps more likely to have higher power transmitters?).
Mike W9MDB
On Friday, October 15, 2021, 11:45:16 PM CDT, Rich - K1HTV via wsjt-devel
<wsjt-devel@lists.sourceforge.net> wrote:
Has anyone experienced exaggerated dB signal reports givenby WSJT-X to decoded
FT8 signals of stations transmitting tone frequenciesbelow 500 Hz? I use a K3
with 2.8 KHz filter using WSJT-X Version 2.5.0 . Ihave also seen this in
earlier versions.
When stations using low audio tones are decoded, the signal levelsthat WSJT-X
gives them far exceeds the levels given to signals with higherfrequency tones
of equal intensity level observed visually on the wide graph.
I have run the “Measure Reference Spectrum” tool on a quietfrequency and have
the “Ref Spec” checkbox on the Wide Graph checked. This didn’tresolve the noted
anomaly. I first observed this on Foxes running 3 or 4streams 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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