Posted by
ROBERT CARROLL-4 on
Sep 20, 2006; 3:11pm
URL: http://elecraft.85.s1.nabble.com/Hearing-CW-Fundamental-Keying-Waveform-tp393945p393960.html
As long as we are discussing hearing cw I'd like to ask a question that has
been bothering me for many years. I am very sensitive to chirp, and that is
not what I am referring to. When I listen to a good cw signal in the range
of about 20-35 wpm I heard the dots and dashes as at slightly different
frequencies. This may simply be some sort of psychological quirk unique to
me. I am not even sure "slightly different frequencies" or tones is correct
way to describe it. Realizing that I am not listening to a sinusoidal tone
but sequences of short and long symbols and that long strings of dots will
have wider sidebands than long strings of dashes, I wonder if this is
relevant in any way. Most likely it is some sort of personal quirk. But I
wonder if anyone on this reflector by any chance notices anything similar or
has an explanation?
Bob W2WG
-----Original Message-----
From:
[hidden email]
[mailto:
[hidden email]] On Behalf Of Martin Gillen
Sent: Wednesday, September 20, 2006 9:13 AM
To: elecraft
Subject: RE: [Elecraft] Hearing CW - Fundamental Keying Waveform?
Hmm,
> Any detectable chirp seems to drive some of today's ARRL "Official
> Observers" into near apoplexy but I enjoy hearing it!
That's interesting.
Which FCC or ARRL guideline mentions chirp, or otherwise attempts to
regulate the keying waveform?
I had a look through our Canadian guidelines:
RIC 2 - Standards for the Operation of Radio Stations in the
Amateur Radio Service
I can't find anything about chirp, although there is a clause about
frequency stability, and I suppose that chirp could be defined as
frequency stability over a period of time equivalent to a code
element. But I rather think that it means drift and not chirp.
So - as long as I keep to 6kHz bandwitdh and 1kHz on 30m, then it
looks like I'm allowed to have chirp on my signal.
Now where do I need to solder a small cap on the KX1 to introduce some
nice distinctive chirp on my signal?...
73
Martin.
VA3SIE.
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