Jim,
Here is an interesting story:
I had a hearing test many years ago, and asked to see the results.
Turns out I had a null at some frequency I don't remember right now, but
it was exactly where I had selected my sidetone to be... My guess is
because I heard less noise there... Anyway--
I re-selected a new sidetone, lower in frequency, and on a small peak...
My CW speed for copy increased probably 10-15%.
Now whenever I get a hearing test, I ask for a copy, and put the
sidetone where my highest peak is, within the range Elecraft allows for
sidetone.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 3/13/21 3:44 PM, Jim Brown wrote:
On 3/13/2021 10:48 AM, Sverre Holm (LA3ZA) wrote:
A CW sidetone pitch of 400 Hz is consistent with what little research
there
is on this. A paper from 1992 says that "/All subjects improved their
recognition as the frequency was lowered to 500 Hz, some even at 250 Hz.
As a retired designer of large sound systems, I had to learn a lot about
acoustics and psychoacoustics (the science of how humans' ear/brain
interprets what we hear). That science tells us that, like most of our
senses, hearing is logarithmic both with respect to frequency and
loudness. This means that our discrimination of one frequency as
compared to another increases with decreasing frequency. That is, we are
better able to separate signals from each other with RX pitch set to
lower frequencies.
73, Jim K9YC
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