[Elecraft] [K3] 150 watt "boots" for 160m

[Bill W4ZV]

Guy, K2AV wrote:
> 
> If one wants to dig up the research...
> 

http://www.audioholics.com/education/acoustics-principles/human-hearing-amplitude-sensitivity-part-1

"Speaking now in terms of dB SPL, the minimum discernable changes by the
human ear/brain mechanism I've seen in the research that I've reviewed
ranged from about 0.5 dB to 3 dB, depending on a number of factors."

Table 1 (see the referenced link above or below)

In Table 1 we see a collection of studies spanning 60 years. It should be
kept in mind that in each case the results were obtained under
laboratory-ideal conditions. Even so, we see a range of values from .25 dB
to 3 dB. The resultant range is owing to varying methodologies used by the
researchers and, of course, the response of the human hearing apparatus to
the applied acoustic signals.

<SNIP>

>From the third column of Table 1, we see the minimum detectable value, for
the most part, hovers around 1 dB, +/- a fraction of a dB, and that
attainable only with ideal (or at least as ideal as technology allowed for
at the time the study was done) laboratory test conditions and test
subjects. I tend to use .75 dB to 1 dB when considering minimums."

http://www.audioholics.com/education/acoustics-principles/human-hearing-amplitude-sensitivity-part-1

73,  Bill



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