Greenkeyers, I've posted a several new AFSK files at 5bits.net These are listed under Technology History in the second column. There are both 170 and 850 shift, with 45.45, 50 and 75 baud for 1st, 2nd and 3rd gears on your 28s! You can print on demand to get the full articles. Let me know if they work out for you. 73, John W1AN