The rampant clicks I am referring to are +/- 500-800hz
from the fundamental and clearly audible with a xtal
filtered receiver. They are not the artifact of the
receiver, they are present in the xmit signal (keying
rise/fall time too fast) of some (not all) modern
rigs. Just tune across 40M and you'll hear some
signals that are completely clean and some signals
that are horrendously clicky.
73,
Barry N1EU
--- Steve Ellington <N4LQ@igLou.com> wrote:
> Now let's tune our RX
> to within 200hz of a strong cw signal. You will hear
> strong clicks. Why?
> Because they are there. That's why. No matter how
> clean his TX is, there's
> still clicks when you tune that close. > -----
Original Message -----
> From: "Barry N1EU" <n1eu@yahoo.com>
> To: <tentec@contesting.com>
> Sent: Tuesday, November 26, 2002 2:57 PM
> Subject: [TenTec] CW Key Clicks and Filters
>
>
> > W8JI deserves a lot of credit for drawing
> attention to
> > this serious problem. Clicks are a function of
> the
> > rise and fall time of the trasmitted waveform, and
> > should therefore be independent of keying speed.
> >
> > I have to take exception to W4BQF: "I seriously
> doubt
> > that there were very many contest stations
> generating
> > key clicks during the contest as most contesters
> are
> > pretty knowledgeable technically."
> >
> > I don't know which contest is being referred to,
> but
> > key clicks were rampant on the bands in CQ WW and
> > they're caused by poor transmitter design, and not
> > poor operators or poor receivers. Some rcvr
> filters
> > can emphasize the clicks, but if the clicks are
> being
> > transmitted you're going to receive them.
> >
> > 73,
> >
> > Barry N1EU
> > www.albany.net/~bg
> >
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>
>
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