[Elecraft] Elecraft K2 CW key shaping

[Matt Maguire]

Generally a chirp would be due to an unstable power supply, resistance in
the fuse holder, etc.. It can also be cause by poor decoupling/loading of
the oscillator circuit, but in the case of a well-designed circuit like the
K2, this would normally  only arise with misplaced components or poor
connections.

On Tue, 14 Jul 2020 at 18:01, Victor Rosenthal 4X6GP <k2vco.vic at gmail.com>
wrote:

> A chirp can't be seen visually on an oscilloscope (well, maybe on a
> panadpter or spectrum analyzer if it is a very big one).
>
> A chirp is a change in frequency of the transmitted signal. It is not
> the same as a click, which is a wide signal caused by too-short rise and
> fall times of the keyed envelope, or a badly shaped envelope. You can
> see the envelope shape on an oscilloscope. But the change in frequency
> caused by a chirp is very small in comparison with the frequency of the
> signal.
>
> The way to detect a chirp is to listen to the transmitted signal on a
> second receiver. Your ear is very sensitive to changes in pitch.
>
> 73,
> Victor, 4X6GP
> Rehovot, Israel
> Formerly K2VCO
> CWops no. 5
> http://www.qsl.net/k2vco/
> .
> On 14/07/2020 9:29, dl2ki wrote:
> > Hi,
> >
> > since someone told me that there is a small "chirp" in my K2-CW signal, I
> > would like to check the signal visually.
> >
> > How can I display the CW Key envelope as shown in the document "Elecraft
> K2
> > Keying Modification Instructions", page 1.
> >
> > An oscilloscope "Tektronix 2465A" is at my disposal, but I have little
> > experience with measuring instruments, since I only use them
> occasionally.
> >
> > Thank you and 73
> > Wolfgang
> > DL2KI
> >
> >
> >
> >
> > --
> > Sent from: http://elecraft.365791.n2.nabble.com/
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