Based on the emails I have been getting, I apparently didn't state this
well. I am VERY happy with the level of filtering that I have been
getting from the K2 in CW mode. The ability to turn the AGC off and
drill down with the filters has been a great improvement over the 718.
That being said, the next time I put the system on spectrogram, I am
going to have a couple more tools available that I didn't have the first
time around, and one of things I am going to be looking at is making the
last two filters a little more narrow. I hope to do this without
greatly attenuating the signal. Neither of these statements is meant to
be a disparaging remark, merely a statement of what I hope to
accomplish. One of the reasons I chose this rig, was because I can
tailor the filters as I see fit.
I played with the SSB on 80m the other night, and didn't get the level
of rejection of adjacent signal interference that I would have liked.
That being said, I have NOT put the rig back on Spectrogram since
setting up the SSB board. So my first assumption was that I have not
done my due diligence, not any deficiencies with the rig.
David Wilburn
[EMAIL PROTECTED]
K4DGW
K2 #5982
David Wilburn wrote:
I have an 718 with the 250 Hz filter. That filter locks down things
quite well, but it also allows "blow by" with large nearby signals that
make things difficult also. In the short time I have been a CW op, the
skill that Ron mentions is just starting to get to me. I have often
been frustrated by other ops nearby. That is part of what drove me to
the K2, was the many choices of filters.
I agree with Scott, in the since, that I am seeking a way to make that
last filter have more isolation capability without further attenuating
the signal. Now that I have a little bit better idea what is going on
with Spectrogram, after I have all the pieces finished, I plan on making
another pass with that while sending some tones through and seeing what
kind of tweaking I can accomplish.
Scott, have you put your K2 through the Spectrogram alignments yet? I
was not terribly impressed with the filters after the default settings
were installed, but I was amazed after (several tries) I gave the
filters a good alignment with Spectrogram.
David Wilburn
[EMAIL PROTECTED]
K4DGW
K2 #5982
Ron D'Eau Claire wrote:
I can't speak about the 718 or the Elecraft DSP, but in my experience
such
"brick wall" filtering creates far more problems than solutions. A huge
amount of unwanted stuff is produced by signals on the sharp edges of
such a
filter that appear throughout the passband - much of it is that
'noise' you
mention.
I work 99% CW and my K2 is seldom set for less than 1.0 kHz bandwidth. My
minimum is 0.4 kHz used only when I get a "loudmouth" shouting from
almost
on top of the signal I'm copying. That occasionally happens during a
contest, but that's about it.
I do have a skill that a great many experienced CW ops have that might be
the difference. We can copy easily with several signals within the
passband.
It's like listening to one voice in a crowded party; we just "tune
out" the
other babble going on around us unless it's something we want to
follow. It
only gets difficult if one nut starts shouting in my ear when I'm
trying to
listen to someone else, Hi!
Ron AC7AC
-----Original Message-----
Hello
I haven't had my K2 (# 5846 ) long enought to fully understand all the
different settings that are possible with it , so I have a question.
My CW
filter setting are FL-1 1.50, FL-2 0.70, FL-3 0.40, and FL-4 is 0.10.
Even FL-4 is no where near as effective as the 250 hz crystal
filter in my Icom 718. When I turn on the 250 hz filter in the Icom, it's
like building a wall right on each side of the signal that I am listening
to. Nothing else is heard except noise and signals that are exactly on
the
same frequency. Is this kind of selectivity possible with the K2? If I
installed the DSP option would that help? And if so, what would the
filter
settngs need to be? The only options I presently have are the 160 meter
option, noise blanker, serial adapter, ssb option, and the KPA100. Thanks
Scott N5SM
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