First when you overdrive you flat top the CW pulse and make the sides more
straight (vertical) you make it closer to a square pulse. A square wave is an
infinite number of odd harmonics. when you mix the harmonics to the signal it
increases the band width so you got a wide signal. oops forgot to add the
keying speed into the mix. that also adds to the band width.
In the old days using cathode keying we simply put a condenser across the
keying line.
Any of this drivel make sense.
K8OT
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