[GreenKeys] Wheatstone Tape setup 1930

[Harold Hallikainen]

So, the Instructograph just had longer dash holes while commercial CW tape
perforators and readers used one hole position to start the symbol and
another to stop it.

I thought it was one position for dit and the other for dah. It allows for
the same size hole to be used for everything. I was thinking along the
lines of a player piano where the length of the hole determines how long
the key is down.

I did a little work on a Bunnell pen recorder. This could be used to copy
Morse, though I think the recorders used on radio circuits were more like
chart recorders where the vertical displacement of the line indicated
signal strength, and the horizontal displacement was time. I think this
made it more readable through fades than a simple threshold and on/off
marking of the tape would get.

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.

Harold
https://w6iwi.org
Autostart on 14.086 MHz LSB



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