Barry I had very similar problems when I first started using the internal K3 keyer after many happy years of using an outboard K1EL keyer with various rigs. I experienced great difficulty forming the letter "C", but perseverance has more or less eliminated the problem. The K3 is obviously not so tolerant of timing errors and if memory serves me right it took week or two to get it right. BTW I use only Iambic Mode A. Guess it's all a question of how long you are prepared to stick it out until you find the timing that suits the K3. 73 Norman GM4KGK
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