There's also the simple fact that a given frequency separation at a lower
side tone frequency represents a greater percent difference. That is, the
difference between a desired 200cps tone and an interfering 250cps tone is
25%. The difference between a desired 450cps tone and a 500cps tone is 11%.
That's over a 50% difference in what the operator is asking the brain to
discriminate, and that's a significant difference.
...robert
At 03/13/2008 14:27, John King wrote:
400 Hz is my upper limit as well.
Lower than 300 Hz is certainly desirable to me.
I have forty plus years on CW, and no significant
hearing loss. I do the between-the-headphones DSP
far more effectively at 400 Hz and below.
73,
john WA1ABI
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of David Cutter
> Sent: Thursday, March 13, 2008 2:17 PM
> To: Bill W4ZV; elecraft@mailman.qth.net
> Subject: Re: [Elecraft] CW Secrets of the Masters
>
>
> This makes perfect sense. The ears have a logarithmic response to sound
> pressure and to frequency.
>
> David
> G3UNA
>
> >>
> >>
> >> Another one that Fred K3ZO (many time winner of Dayton CW pileup
> >> contests)
> >> recently mentioned is using extremely low pitch for weak signals. Fred
> >> said many commercial ops he knew used somewhere in the 2-300
> Hz range so
> >> he thought his favored 400 Hz was rather high!
> >>
> > 73, Bill W4ZV
> >
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Robert G. Strickland PhD ABPH - KE2WY
[EMAIL PROTECTED]
Syracuse, New York USA
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