All, I spent a little time this weekend comparing FSK-Hell to the standard Feld Hell mode. FSK-Hell is a modified version of PSK-Hell which was developed to improve readability over HF. The difference tends to show up more on long-haul paths where signals are more likely to encounter ionospheric distortion.
Unfortunately, I didn't find any DX, but I did manage to work a few west coast stations from here in W2. I didn't expect to see much of an improvement since conditions on 20 meters were relatively quite (moderate multi-path fading), but in practice, there was a noticeable difference. Contrast was noticeably improved and the text did stand out more with FSK-Hell than it did with Feld Hel. This is especially true with weak signals. The 105 baud mode allows even more contrast which shows up both on-air and with the path simulator. All in all, FSK-Hell does offer better readability over Feld Hell. Click on the link below to see an on-air and example of how the modes compared. FSK-Hell is available in IZ8BLY's Hellschreiber (FM-Hell), DM780, MixW and Multipsk. http://www37.zippyshare.com/v/71092013/file.html Tony -K2MO
