Good morning all,
I keyed my original LF TX with a relay - crude, but it got me on the air.
I know many designs just filter the keying waveform to "round off the
corners" of the envelope.
But I read that the best envelope shape is a "Gaussian waveform". This
produces the smallest sidebands.
[ http://fermi.la.asu.edu/w9cf/articles/click/click.html and lots of other
RC and LC filter circuits produce exponential waveforms, although the
waveform diagrams that accompany these circuits in the texts often make then
look as though they produce a gaussian waveform.
My question is ...
Is there a circuit that will produce a nice "gaussian wavform" that I could
feed into an AM modulator to produce really clean CW - or is there no such