Oliver, My K3 goes down to 300Hz!
73 Stephen G4SJP On 20 October 2013 18:43, Oliver Johns <[email protected]> wrote: > 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 <[email protected]> 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:[email protected] > > > > 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:[email protected] > > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
