> Tom says:
and still says:
> >Keying speed is relatively unimportant as to bandwidth
>
> Well, yes...............and no. At high/very high speeds, the rise and
> fall times can be a greater percentage of the dot. But the main point
> there is the claim that at high speeds, hard edges are easier to read. As
> I can just about do contest exchanges at 30 wpm or so, and certainly can't
> have a chat at that speed, I couldn't judge. I usually figure that 10-90%
> rise and fall time of around 2ms is OK.
You are talking about on-frequency sound, and I am talking about
clicks up and down the band.
> I wonder how they managed to design it like that! Surely it didn't happen
> by accident?
Newer engineers have little grasp of analog systems, and virtually
no understanding of things like bias stability or IMD in receivers or
transmitters. If you look at equipment, it is basically in a downward
performance trend as more and more useless features like 1000
filter DSP systems are added.
I suspect what is happening is younger inexperienced software
engineers are taking over more of the design details.
PSK is a good example, it has a 50dB or so dynamic range and
people are in love with it. Of course they want a world-wide limit of
ten watts with a coathanger antenna so the crummy dynamic
range of the system is hidden. If we tried to operate SSB or CW
with a 50dB dynamic range, we would face the same silly idea that
power is a problem.
73, Tom W8JI
W8JI@contesting.com
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