An ultimatic adapter for iambic keyers", Kevin E. Schmidt, W9CF, 2008):
- Lin = 1, Rin = 1 => Lout = 0, Rout = 0.
- Lin = 1, Rin = 0 => Lout = 0, Rout = 1.
- Lin = 0, Rin = 1 => Lout = 1, Rout = 0.
- Lin = 0, Rin = 0 after Lin = 1, Rin = 0 => Lout = 1, Rout = 0.
- Lin = 0, Rin = 0 after Lin = 0, Rin = 1 => Lout = 0, Rout = 1.
When I implemented the ultimatic adapter after W9CF's instructions, it struck me that it would be both useful and easy to add an emulator for a single-lever paddle also. When both keys are pressed in this mode, the last one to be pressed is ignored. This gives the following inverted outputs in states 4 and 5:
- Lin = 0, Rin = 0 after Lin = 1, Rin = 0 => Lout = 0, Rout = 1.
- Lin = 0, Rin = 0 after Lin = 0, Rin = 1 => Lout = 1, Rout = 0.
The exchange mode is actually quite fun to use. In general for me it is easier to swap the paddles when keying with my left hand. I don't think I am the only one with that experience.
The C code for the main routine is on a separate page. These days I should probably have written it for the Arduino, but the code should be easy to move. Perhaps I'll do that myself, now that I have an Arduino Mega on order.
Many keyers have the ultimatic mode and the possibility to exchange right and left, but no keyers have the single-paddle emulation mode as far as I know. I think it is quite useful. This summer when I implemented it I thought it was novel also.
But that was before I found out that this mode actually had been proposed by Larry Winslow, W0NFU, in QST in October 2009 and that one can get an iambic to single paddle kit from WB9KZY. Oh well, "there is nothing new under the sun" as the wise man of Ecclesiastes said some 3000 years ago. Just like the ultimatic mode has been implemented in many keyers these days, let me propose the single paddle mode for implementation as a new command also.