http://www.aa5au.com/rtty.html Jeff, and others...use this link for some good info on RTTY in general, and MMTTY. I strongly suggest you do not use VOX unless you precede each message with several spaces , ect. Vox simply cannot respond quickly enough. The transistor interface I described is simplicity in itself, and will let MMTTY key the rig without missing any letters. 73 Ed