From: "Mike Dennison" <mike.dennison@rsgb.org.uk>
To: rsgb_lf_group@blacksheep.org
Date: Thu, 22 Jun 2000 10:24:42 +0100
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Subject: Re: LF: Reference sound for shrinking
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> Does anybody have recorded sound of Visual-CW (as *.WAV with reasonable
> length) where the signal is not hearable by ear? Could we have such a
> reference sound to compare the results of processing? I would like to try
> to shrink the sound in SW like SoundForge or CoolEdit and compare results
> with the others, mainly with Bill.
> 
> 73, Petr, OK1FIG
>

Petr,

On my web site is a .WAV of a transmission made in 1998 by the 
late Peter Bobeck as DA0LF. The Morse has a 20s dot period. It is 
1.3Mb and lasts for 2 minutes, during which he sends a dash and a 
dot! He is not quite inaudible but certainly would have been 
unreadable at normal speeds as the signal is only just perceptible. 
The page also gives spectrograms traces of the signal - absolutely 
100% with no noise.

http://www.dennison.demon.co.uk/da0lf621.htm

73


Mike, G3XDV (IO91VT)
http://www.dennison.demon.co.uk/activity.htm