Re: LPF frequency curves #lpf

Daniel Ekman SA2KNG

On Thu, Dec 28, 2017 at 1:39 PM, Al Holt <grovekid2@...> wrote:
On Wed, Dec 27, 2017 at 10:49 pm, Paul Jorgenson KE7HR wrote:
.......A square wave is the fundamental and all the harmonics.......
I learned recently prepping for the Extra Class exam a sawtooth wave is composed of the fundamental and all harmonics; square waves are going to be predominately made up of odd harmonics as Bob Sutton's measurement bear out.

AFAIK, these single transistor amplifiers (class C, E) have a non symmetric output, looking more like half wave recitified AC even when driven with a square wave, thus contains large even harmonics. Of course it will be a mix of both, but it's not free from the even ones (:


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