Hello all,

I read in the general summary in the SM7CMY report:

"It was found that:
- The ability to recognize telegraphy masked by noise decreases with increasing 
telegraphy speed;
- A low frequency improves recognition. There is a hearing level for best 
recognition;
- Best recognition is obtained with the telegraphy signs 180 degrees out of 
phase between the ears with the masking noise in phase;
- In hearing-impaired telegraph operators, the critical bandwidth is affected 
but not the phase phenomena;
- A human telegraph operator outperforms the electronic decoders at low 
signal-noise ratios;
- Detection of trains of tone pulses masked by noise improves when the duration of 
the tone pulses is increased and when the duration of the gaps between the tone 
pulses is decreased. Thresholds of trains of pulses can be predicted  by a formula 
that accounts for the total energy in the train."

I have been in touch with the author and he is positive to publishing the 
material on the www.
There are 120 pages to scan in case the original files are not available.

/Regards
Christer
sm6pxj