The XT-4 is a battery powered CW memory keyer. The pro version now features a stand alone keyboard. . . Logging and Contest Program Interfacing via K1EL Winkey 1. ". I have built several K1EL kits, and they are well-designed and well-made. Another reason is that Ive had problems with MFJ products in the past and dont usually recommend them. I have built several K1EL kits, and they are well-designed and well-made. . The Wabun CW QSOs are popular in 80mb and 40mb, plus 144MHz band, because of the characteristics of the propagation.