Evaluating Keying Characteristics
Posted by
Jim Brown-10 on
Jun 12, 2020; 6:21pm
URL: http://elecraft.85.s1.nabble.com/CW-rise-time-setting-tp7661876p7662107.html
On 6/12/2020 3:23 AM, E.H. Russell wrote:
> Thanks for the scope shot and info. I compared the waveform to the QST K3S review, which seems to show a little over 10ms before RF appears. Is this because they used different settings?
I repeat my advice that keying characteristics must be evaluated in the
FREQUENCY domain (as occupied bandwidth), NOT in the TIME domain
(oscilloscope). The reason has been stated here many times -- it's not
only the TIME of the transition that determines bandwidth, it is the
SHAPE of the transition from off to on and on to off that matters, NOT
the time it takes, and this cannot be seen on a scope.
73, Jim K9YC
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