And what about the effects of compression?
Wouldn't the AGC tend to reduce the dynamic range between the noise floor and
the CW elements? Would an audio expander help to make the CW stand out from
the noise better and therefore easier to hear?
73,
Darrell VA7TO K2 #5093
--
Darrell
On Tue, 19 Sep 2006, Ron D'Eau Claire wrote:
Y'know there was actually a time when a fellow could tune across a band,
especially 80 or 40, and immediately recognize various stations by the
keying characteristic of their rig and their fists on a mechanical key.
Different stations had
: [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
At 09:13 AM 9/20/2006, Martin Gillen wrote...
Which FCC or ARRL guideline mentions chirp, or otherwise attempts to
regulate the keying waveform?
97.307(a) No amateur station transmission shall occupy more bandwidth than
necessary for the information rate and emission type being transmitted, in
PROTECTED]
[mailto:[EMAIL PROTECTED] 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
Dan KB6NU wrote:
This discussion is very interesting to me. I hate copying stations whose
keying isn't sharp enough. The dits and dahs seem to blend together. It
seems to me that with all the DSP power that modern rigs have, there
should be a way to sharpen up a CW signal to make it more
]
[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
Bob:
As you correctly note, a CW signal is not a pure sinusoid. The
Fourier spectrum of an individual dot or dash is a distribution of
frequencies with a peak at the dead carrier frequency. There is an
inverse relationship between the width of a pulse in the time domain
and the width of its
Hi Bob,
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
On Wed, 20 Sep 2006 10:57:15 -0400, Stephen W. Kercel
[EMAIL PROTECTED] wrote:
In cognitive processing of sensory data, the brain functions a
differencing engine. Each brain has a capability of distinguishing
audible spectra, but some are more sensitive to particular nuances of
difference than
In a message dated 9/20/06 6:29:25 PM Eastern Daylight Time,
[EMAIL PROTECTED] writes:
My conscious brain only reports differences, not absolutes.
How can that be, assuming you were able to learn to read and write, speak and
understand speech?
The
result is that 'dash dash dot dash'
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
-Original Message-
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
Darrell Bellerive wrote:
What is meant by the fundamental keying waveform?
I've wondered that myself. CW is made up of two separate periodic
waveforms ... one is symmetric (the dits) and one is asymmetric (the
dahs) and they occur in a more or less random sequence. For a given
sending
Ron, AC7AC wrote:
The carrier is keyed on and off sharply. That is, it rises from zero to
maximum quickly at the start of each code element, then drops back to
zero quickly at the end of the element.
==
Not too quickly, or clicks will result. The K2 had quite bad clicks
(+/-1500 Hz)
Earl, K6SE wrote regarding keying:
Not too quickly, or clicks will result. The K2 had quite bad clicks
(+/-1500 Hz) until they developed a mod to cure that problem. K2 kits now
include the mod, and they are among the most click-free of rigs today, with
clicks extending only about +/-200 Hz from
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
Ron, AC7AC wrote:
You missed the rest of that post. I wrote
==
No, I didn't miss any of the rest of your post. I merely commented
further on the key click problems of today's modern rigs.
BTW, Elecraft is the only manufacturer who admitted there was a click
problem (a 3 kHz BW for a CW
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