Hi Matt,
I used to think I could copy CW signals below the noise.
However when I put SPECTROGRAM in line and actually measured the S/N
ratio the results were disappointing.
According the SPECTROGRAM, those "in the noise" signals actually had an
+8-10 dB S/N ratio.
Try it and see for yourself.
Likewise those WSPR and JT65 guys have been mislead by the -dB (e.g.
-20) edited signal strengths. They need to know that those are
calculated with a 2.4 - 2.8 KHz assumed noise power. In reality, many
of the negative "dB" value signals can be copied by ear.
73 de Brian/K3KO
On 11/16/2016 2:37 AM, Matt Murphy wrote:
Louis,
FWIW I like my K3 noisy, almost so it sounds like there is no AGC action,
just enough to protect my ears from an unexpected loud signal. I've found
that this makes it easiest to copy extremely weak CW signals that are below
the noise, and prevents static pops from covering up the signal. The two
settings to adjust are AGC threshold and AGC slope. Start with threshold
as it will make the biggest difference in how strong vs weak signals
sound. If you need finer-grained control, the AGC threshold can be useful.
The other settings should be fine at their default values. The AGC decay
"soft" setting is preferred by some in pileups, so you might try both
settings.
I found this writeup which looks pretty good:
http://www.ad4c.us/Elecraft%20K3/AGC%20Tutorial.pdf
73,
Matt NQ6N
On Tue, Nov 15, 2016 at 7:42 PM, Don Wilhelm <donw...@embarqmail.com> wrote:
Louis,
I am not one to give you specific settings for you to just plug in and
use. If I did so, I would just tell you to use the default settings.
Every location and operating style is different, and you can enhance the
AGC performance to meet your particular situation.
Please read the "Noisy K3" information on my webiste www.w3fpr/com to give
you guidelines on how to adjust your particular AGC.
Pay particular attention to the method for evaluating the results of your
adjustments - it is critical that you listen to short gaps in the CW or SSB
voice to determine the best settings for you.
73,
Don W3FPR
On 11/15/2016 5:46 PM, louis a. ives wrote:
I have been following the thread with regards to the setting of the AGC
of the K-3 with great interest. I am new to the use of the K-3 even though
I have owned the radio for some time. I had a medical issue that delayed
my use of the unit. My K-3 has been updated with all of the current K-3s
upgrades and I use a KPA500. The thread has given several settings for AGC
SLP and AGC THR but I noticed that the setting for the other AGC settings
are not mentioned. Should I assume that the other default settings are to
be used? I tried the suggested settings and found that they did help with
the reception of weak signals. I work a lot of DX SSB and working the
pileups can be a problem. I also would like to thank KE7X for the great
book on the K-3, it has been a great help and has answered a lot of
questions.
Any help would be appreciated.
Thanks in advance
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