In article , Leo
writes:

What I found interesting was the pattern on the (Tek?) scope above the
rig.....must have an incredibly slow sweep setting and very long CRT
persistance to display 'CQ' in pulses from the key like that! 0

Not necessarily!

At 30 wpm, the displayed code requires a sweep time of about 1.2 sec

73 de Jim, N2EY