Version 3.10 of the PC C source is back, linked from http://www.proaxis.com/~boblark/dsp10.htm The link is a bit more than halfway down, under "Ver 3.10 PC SOURCE CODE." The file name is uhfa310a.zip. If you had uhfa310.zip, I believe it is missing a couple of files. These are in the linked zip file. Thanks Jimmy and Lyle. 73, Bob