"Richard Fry" writes:

Reg Edwards wrote
The shape of the pulse, the width of the pulse, the time interval
between pulses, all affect the harmonic frequency spectrum.
They act both independently and in conjunction with each other.
________________

Please explain the reason why the bandwidth characteristics needed to
generate a single transition from one DC level to another is different than
when repeating that same transition any number of times before or after.

One way to look at it is to consider the harmonics produced by all the
rising edges, and spearately consider the harmonics produced by the
falling edges. Both contain all of the harmonics, but since they are
displaced in phase, some of them get cancelled.

Obvious example: a square wave contains only odd harmonics.

Regards,
Allen WA0OHE
--
Allen Windhorn (507) 345-2782 FAX (507) 345-2805
Kato Engineering (Though I do not speak for Kato)
P.O. Box 8447, N. Mankato, MN 56002