Dave, W1EUY, pointed out to me that he has written an article on how to use the Mac to align the K-2. It is entitled Aligning the K2's CW Filters (for Mac Users ONLY) and is on the Elecraft Builder's resource page: http://www.elecraft.com/Apps/new_fil_docs/filter_apps.htm - Duffey -- James R. Duffey KK6MC/5 Cedar Crest, NM DM65