Hi Jim, My only gripe is that the K3 choice range doesn't go down to 400 Hz. I'd like to use 440, a pure standard A.
73, Oliver W6ODJ On 19 Jan. 2013, at 22:30 PM, Jim Brown <j...@audiosystemsgroup.com> wrote: > On 10/19/2013 2:36 PM, Al Lorona wrote: >> When I was a kid 750 Hz was the most popular sidetone frequency. I have >> noticed a steady decrease in the consensus spot frequency over these 40 >> years. I don't know why. > > I'll inject some science into the discussion based on my profession of > electroacoustics. Human perception of sound is logarithmic, both with > respect to amplitude and frequency (pitch). Another way of saying it is that > our ability to separate two notes is a function of their percentage > difference. For the same bandwidth in Hz, we have better discrimination > between two note a lower frequency, because the difference is a higher > percentage of the frequency. So it's easier to discriminate a 100 Hz > difference at 450 Hz than at 750 Hz. That's one good reason to use a lower > pitch. > > Another is that for most (but not all) of us, hearing loss is greatest at > higher frequencies, so we old farts tend to have somewhat better hearing at > 450 Hz than at 1 kHz. That's not universal though -- those of us who were > exposed to noise (usually at work) that's much louder at some frequency(ies) > tend to develop notches in our hearing at those frequencies. > > 73, Jim K9YC > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
