At 12:20 AM 05/12/2004, Alfred Lorona wrote:
The differences between the two modes are really quite subtle. It was
first identified as a design parameter by famed keyer designed Chet Opal,
w9to, in 1975. He called it 'echo' for want of a better name at the time.
W9TO was Jim Ricks, originator of the "digital" keyer back in the mid
fifties. Don't think he added any subtle features in later years.
Perry w8au
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