It's a feature in fldigi, HRD, MixW etc.
Here's some work I did on it in 2004; I don't know if the MixW version
pre-dates my proposal, as I've not used MixW. Dave W1HKJ implemented it in
fldigi.
http://wa5znu.org/log/2004/09/psk-visual-cq.html
Leigh/WA5ZNU
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On PSK31 some guys know how to transmit a sequence of tones to write a '73' or
a
smiley face on the waterfall. Does anybody here know what software they're
using
to do this? IMO it's a little corny, but I am curious.
Al W6LX
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