[OT] '73' on the waterfall

[alorona]

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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[Leigh L. Klotz Jr WA5ZNU]

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