At 72 I've discovered that my left ear is pretty much worthless above 1 kHz while my right one works up to about 8 kHz. They both seem to have about the same sensitivity "below cutoff." When I was a kid I could hear the 15 kHz TV horizontal oscillators clearly (and do a lot of other stuff better, too). My best CW pitch seems to be around 520 or 530 Hz.
Vic 4X6GP/K2VCO > On Mar 2, 2015, at 8:35 AM, Jim Brown <[email protected]> wrote: > >> On Sun,3/1/2015 10:25 PM, Rick Tavan N6XI wrote: >> Yes, I've noticed this. I have no real knowledge of why low tones seem to >> make for better copy in QRM but I have guessed that it has to do with the >> relative difference in interfering tone for a given offset from the desired >> signal. If you listen to 1000 Hz (which many ops do) and the interfering >> signal is 100 Hz away, the difference is only 10%. But if you listen to 400 >> Hz, the difference is 25%. So the filter in your brain may be more >> effective distinguishing 400 from 500 Hz than it is in distinguishing 1000 >> from 1100 Hz. Just a guess. > > That's my audio professional's best guess too. In general, we humans hear > logarithmically. Also, we hear differences in sounds that are separated by > some "critical bandwidth" that is in the range of 1/3 to 1/6 of an octave. An > octave is a 2:1 frequency ratio. So figure 2 to the 1/3 power and 2 to the > 1/6 power. > > I set my radios between 500 - 550 Hz. Those with severe high frequency > hearing loss might want to try even lower frequency settings. Most (but > definitely not all) hearing loss is greatest at the higher 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 > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
