Most people who know a little about BDA and driver implementations will tell you that many driver implementations ignore the comments above and just give 0 - 100 readings as percentages. This being the case, MediaPortal's TV Server currently coalesces the readings to that range (ie. any reading less than 0 is bent up to 0, and any reading greater than 100 is bent down to 100). TV Server also calculates an average over all readings it finds, because tuners may actually offer multiple readings of strength and quality. That adjusted figure is what you get to see.
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