All, It's interesting to see how the various Hellschreiber modes print in the noise. There is a noticeable difference in contrast and character definition which is likely to affect the overall readability over HF. The disparity seems more apparent on-air than it does under the controlled environment of the path simulator.
The image below (see link) illustrates the different characteristics of each mode after being subjected to the same level of white noise over a simulated channel. This is purely a sensitivity test - it does not show the affect of HF distortion. Hellschreiber comparison - http://www14.zippyshare.com/v/42533726/file.html Click image to enlarge. Test Software: IZ8BLY's Hellscreiber Path Simulation: White Noise -6db SNR Tony -K2MO
