[GreenKeys] Wheatstone Tape setup 1930

[Harold Hallikainen]

>> It's interesting that the FCC
>> distinguishes CW from data
>> communications in part 97. Though
>> there is a symbol rate limit for
>> data communications, I do not see a
>> speed limit for CW. It would be fun
>> to try running CW at 400 wpm.
>
> I've heard that some of the hot-shots have done that,
> but probably with electronic keyers.  As noted above,
> it was not unusual to run the cable channel at those
> speeds when conditions were good.
>
> Jim  w2jc

It would be fun to do high speed CW on amateur radio using either the old
mechanical equipment or a computer.

Years ago I needed to design a CW ID system for a telemetry system that
could work over radio circuits (FCC part 74 P channels). The ID was saved
in ASCII. The ASCII to Morse conversion was a table lookup. The ASCII bias
for numbers followed by punctuation then letters was subtracted out so a
zero gave an index value of 0. This indexed into an array of bytes where
the 5 lsb of each byte was Morse with 0 being dit and 1 being dah. The 3
most significant bits told the system how many of the lower bits to use
(such as 1 for E or T and 5 for numbers). This was all done in MC6800
assembly language.

Fun stuff!

Harold
https://w6iwi.org




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