Darrell, VA7TO wrote:
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?
---
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 Belleriv
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 - Fundamen
On Wed, 20 Sep 2006 21:07:48 EDT, [EMAIL PROTECTED] wrote:
>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
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
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
>differen
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 slig
Wow, I never thought my question would spur on such a discussion!
So, if I understand correctly we have three components in the transmitted CW
signal that affect what we hear on our receivers:
1) The carrier and it's stability in frequency,
2) the actual keying on and off of the carrier, and
3) t
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
On 9/20/2006 at 3:03 PM, Mike W8UR wrote:
97.307(a) No amateur station transmission shall occupy more bandwidth than
necessary for the information rate and emission type being transmitted, in
accordance with good amateur practice.
(b) Emissions resulting from modulation must be confined to th
t certainly is not
> > 'neighborly'.
> >
> > I am glad to see that this statement does not appear in the more
> > recent
> > handbooks.
> >
> > 73,
> > Don W3FPR
> >
> >
> >> -Original Message-
> >>
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, Sep
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
int
--
From: [EMAIL 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
> Obse
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
nt: 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 a
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:
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 distinctive
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 distinctively different voices. B
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
m
Sent: Tuesday, September 19, 2006 9:32 PM
To: [EMAIL PROTECTED]; Elecraft List
Subject: RE: [Elecraft] Hearing CW - Fundamental Keying Waveform?
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
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: [Ele
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
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) un
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 s
-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 ca
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 absenc
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