Don Wilhelm wrote:
Darrell,
That has ben dropped from the more recent handbook (does not appear in my
2005 edition).
I am going 'out on a limb' here by saying that this stems from the concept
that 'some keyclicks are good' philosophy. Sidebands on a CW signal are the
result of the keying shape, and there is more to it than just the rise and
fall times - there is the rounding at the corners to consider too.
I have heard many an operator state that 'hard keying' will get you through
a pile-up better. While that may be true, it certainly is not 'neighborly'.
Hi Don, I recall a lot of years ago a really good DXer used a
measured amount of chirp on his signal. It was not bad but it was
distinctive. He was a DX station often and you knew his signal in an
instant.
It was back when a radio transmitter had a crystal holder and we
were all building a VFO with some degree of success. My VFO was about
the size of a K2 and it was mounted on rubber to eliminate mechanical
noise. Had to build a voltage regulater with a OB2 that made a sort of
regulated 150 volts for the vfo tube plate. It worked great.
73 Karl K5DI
I am glad to see that this statement does not appear in the more recent
handbooks.
73,
Don W3FPR
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Darrell Bellerive
Sent: Tuesday, September 19, 2006 6:08 PM
To: Elecraft List
Subject: [Elecraft] Hearing CW - Fundamental Keying Waveform?
The recent thread on filter settings and hearing reminded me of a
question I
would like to get an answer to.
In the ARRL 2001 Handbook on page 15.7 we find:
"The dots and dashes of a CW signal must start and stop
abruptly enough so
we can clearly distinguish the carrier's presences and absences
from noise,
especially when fading prevails. The keying sidebands, which sound like
little more than thumps when listened to on their own, help our brains be
sure when the carrier tone starts and stops.
It so happens that we always need to hear one or more harmonics of the
fundamental keying waveform for the code to sound sufficiently crisp."
What is meant by "the fundamental keying waveform"?
How do we take "the need to hear one or more harmonics of the fundamental
keying waveform" into account when setting up the IF and audio filters?
73,
Darrell VA7TO K2 #5093
--
Darrell Bellerive
Amateur Radio Stations VA7TO and VE7CLA
Grand Forks, British Columbia, Canada
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