[CW] GHD Dot Oscilloscope Photographs

[D.J.J. Ring, Jr.]

Yes, Wim, linears can have a problem with sharp corners on CW waveforms -
if they were perfectly square they'd be square  waves  and  generate lots
of harmonics and be quite wide.  Modern day spark perhaps.

Thanks for the addition to the knowledge on this reflector.

73
DR


On Sat, May 5, 2018 at 12:30 PM, pa0wv <pa0wv at amsat.org> wrote:

> Key debouncing can easily be done electronically, The circuit is closed
> when the key closes the first time of the bounce period and keeps closed
> during that bouncing time and beyond, during the dead time of 10 ms. The
> circuit is opened on the first opening of the key that occurs after the
> closing time AND the dead time is also passed.
>
> When you key the dits with maximum 60 wpm the dit mark and dit space are
> 20 ms, so when you allow 10 ms bouncing dead time, you always get perfect
> dits out without delay.
>
> I suppose that every modern commercial transmitter has this already build
> in.
>
> However when I take a look at the waterfall display in the CW part of
> bands during weekends or during contests, which are the same, it turns out
> that a lot of signals have a pretty wide bandwidth due to key clicks. I
> suppose they are introduced by the "linears" in use.
>
> pa0wv
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> =30=
>
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