On Fri, 20 May 2005, Mike Morrow wrote:
I wrote:
Thank goodness for iambic mode A. I never understood how mode B,
the result of a logic design error in an early (1960s) electronic keyer
design, caught on.
Bill wrote:
I built a Mini-MOS key (from a 73 magazine article) back in 1979. It
has dot and dash memories -- the quality that gives it Mode B. It
takes extra circuitry to do this -- it's not just a "logic design
error".
And Dan wrote:
I had a Heathkit keyer on which I learned iambic, and it was all
discrete logic gates and RC circuits. No ICs. It did exactly what
the schematic said it would do. No error there.
True, mode B did catch on (long before 1979) and circuits and chips were
purposely designed to implement it. But the evil that spawned mode B occurred
in an improperly designed keyer from the mid-1960s. Somewhere I've specific
details...but not with me now.
Not quite an answer but the ARRL article on John Curtis said,
"(according to John, Mode B was actually a design error by an unnamed
company)."
http://www.arrl.org/news/features/2002/02/04/2/?nc=1
--
Hisashi T Fujinaka - [EMAIL PROTECTED]
BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte
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