[Elecraft] CW listening pitch

[Rick Tavan N6XI]

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.

73,

/Rick N6XI

On Sun, Mar 1, 2015 at 7:33 PM, Sverre Holm (LA3ZA) <LA3ZA at nrrl.no> wrote:

> There is evidence that it is advantageous with a low tone for the pitch
> (asuming normal hearing). Some studies give evidence for an improvement in
> recognition rate as the pitch is lowered and it more or less seems to level
> off at 500 Hz, except for the lowest SNRs where recognition even improves
> at
> a pitch of 250 Hz.
>
> Some of the research is summarized here (look for paper 2):
> http://la3za.blogspot.no/2013/10/studies-on-morse-code-recognition.html
>
>
>
>
>
>
> -----
> Sverre, LA3ZA
>
> K2 #2198, K3 #3391,
> LA3ZA Blog: http://la3za.blogspot.com,
> LA3ZA Unofficial Guide to K2 modifications:
> http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
> --
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-- 
Rick Tavan N6XI
Truckee, CA