Many thans to all, and a special thanks to KN5L for the oscilloscope traces.... I will insert a debouncer before the key input of my K3S. I have some MAC bugs with the mechanical debouncers, but on the Mac 1937 with debouncer seem to persist a bounces problems, and with the Mecograph the problem seem really a mess... So I have ordered the Jackson Harbour kit. I will say you something about the results using it 73, Ian IK4EWX
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