Ed,
It seems to make little to no difference what operating system you
use. CW Skimmer will never out perform your ears for weak signals; I
don't think it was ever designed for weak signals. But, for most every
other CW signal that is reasonably sent, it does seem to work well. And,
to me it seems to work better when using I&Q data vice just the audio
out of the radio. This just may be the sound card I was using at the
time. I just haven't done the in depth testing; I do admit it would some
interesting testing.
I'm presently using LP-Pan and a Steinberg UR22 running at 196KHz
sampling rate with my receiver usually set to around 250-300 Hz while
contesting. I do suspect that the A/D will make a difference and my
external sound card should be superior to my internal one. What I do
know is that Skimmer uses a statistical approach vice just sampling, and
in a contest when I'm tired, it does better than I do. Do keep us up
with whatever you find.
73,
Barry
K3NDM
------ Original Message ------
From: "Edward R Cole" <[email protected]>
To: "Elecraft Reflector" <[email protected]>
Sent: 10/9/2019 2:43:58 PM
Subject: Re: [Elecraft] K3 CW Text Decoding
Barry,
I had CW skimmer installed on my old winXP computer but was not impressed with
CW detection of weak CW (same for the K3). But I was using K3 line-out audio
so maybe I will try it with my new i5 64-bit machine and feed IF via LP-Pan and
UADC4 (brand new A/D converter which supplies 96KHz dual IQ for diversity Rx).
The UADC4 is the latest toy for the digital-eme crowd (but should find use
outside of eme for general digital op). Its not cheap but has totally flat
audio bandwidth which is supposed to improve IMD performance for urban users.
I am just building my new i5 win-10pro so haven't used it on the air, yet. I
will add a webpage for the UADC4, once operational.
73, Ed - KL7UW
Subject: Re: [Elecraft] K3 CW Text Decoding
Message-ID: <em20cef813-a61b-4d8e-9912-a225efc24835@office-desktop-i>
Content-Type: text/plain; format=flowed; charset=utf-8
Dave,
Your last comment is correct. However, CW Skimmer comes into its own
when you feed it IF I&Q data. You can see what is happening across the
band or a portion of it and still read the signal narrow band. You do
this by clicking on the signal you want to pursue and and listen in
narrow band. By clicking on the wanted signal, the radio is tuned to it.
This does require a little set up and setting offsets, but it is really
worth it. A little interesting point: in a little less than rigorous
testing, I found that that Skimmer seems to work a bit better using I&Q
data rather than just the receiver audio. But, that was not a rigorous
test and someone who is really interested can do the follow up.
73,
Barry
K3NDM
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
[email protected]
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