As a result of "adventures" in my 20's, the entire audio spectrum is a
"notch" with a peak around 590-600 Hz [see K9YC's last sentence].
That's where I put my sidetone/pitch. Around 1990 or so, I built a
little plywood cube with a Mother Bell insert from a standard black
telephone in it. I filled the box with cotton balls and put it on the
side of the rig, pointing up. Over-the-ear headphones had become
ubiquitous and the old "cans" were no longer available so the
"headphones on the desk" trick didn't work well. It was surprising what
I could copy with the little speaker that was mush with the phones on.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 3/13/2021 11:15 PM, Jim Brown wrote:
On 3/13/2021 9:37 PM, Dave Cole wrote:
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%.
One of the most common forms of hearing loss starts at the high
frequencies and works its way down with age, but that's far from
universal. When one or more notches develop at certain frequencies,
it's often the result of noise exposure at work.
73, Jim K9YC
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