Here's an explanation from Chuck Olson - WB9KZY of Jackson Harbor Press about Mode A / Mode B. File attached.
I use Mode A and I use a genuine Curtis keyer chip - like MFJ has in some of their keyers.
Other manufacturers who manufactured Mode A did it incorrectly and you can complete a character and still make an error.
In correct Mode A once a character is sent and you let go, there's no extra dot or dash. That's the way I want it.
I use Mode A and I recommend it because it causes fewer errors if your timing is off.
73
DR
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