decoding weaker sigs

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Joined: 2009/01/23 - 19:45
decoding weaker sigs

I notice that on the visual display there are sigs that the software didn't decode. Watching those sigs in argo I can see they're wspr, but they don't register. They are weak, only just visible on screen.
Is it that these are below the threshold of the software's ability? Am I seeing something beyond about 30 or so dB?