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LF: Key Clicks

To: [email protected]
Subject: LF: Key Clicks
From: "Hugh M0WYE" <[email protected]>
Date: Wed, 25 Aug 2004 10:32:43 +0100
References: <[email protected]> <[email protected]>
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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
stuff ]
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
thing ?

73
Hugh M0WYE

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