http://elecraft.85.s1.nabble.com/K3-Filter-Ring-with-Noise-tp3410069p3411392.html
> You did a wonderful job explaining exactly what I've noticed.
> and at times blips out cw characters. This only happens when
> signals are weak and the band is noisy.
effect of band limited noise. Even though the noise is fairly
desired signal.
noisy conditions but it helps in a couple ways ... first it
appear somewhat stronger than the "random" noise. Second if
ear-brain DSP system to work more effectively.
> settings to no avail. I don't consider this "ringing" since
Try a lower FC and slightly wider filters. Also give the
Dual PB filter a try.
... Joe, W4TV
> -----Original Message-----
> From:
[hidden email]
> [mailto:
[hidden email]] On Behalf Of Steve Ellington
> Sent: Saturday, August 08, 2009 9:32 PM
> To: Edwin Johnson;
[hidden email]
> Subject: Re: [Elecraft] K3 Filter Ring with Noise?
>
>
> Edwin
> You did a wonderful job explaining exactly what I've noticed.
> To me, it
> seems as if the noise mixes or blends with the cw and at
> times blips out cw
> characters. This only happens when signals are weak and the
> band is noisy. I
> recently came across an older TenTec Jupiter which has very
> wide skirts and
> virtually no roofing filter (15kHz). The same noise has no
> effect on it. I
> have done dozens of A/B test and the Jupiter always comes out
> the winner
> until someone with an S9+30 signal gets within the roofing filter's
> bandpass, like 6kHz away, and pumps the hardware AGC
> violently. Then it's
> all over and I either switch back to the K3 and suffer poor
> copy or just
> QRT.
> I've tried all the EQ settings, NR (which helps) and AGC
> settings to no
> avail. I don't consider this "ringing" since that's not what
> I'm hearing.
>
> Steve
> N4LQ
>
[hidden email]
> ----- Original Message -----
> From: "Edwin Johnson" <
[hidden email]>
> To: <
[hidden email]>
> Sent: Saturday, August 08, 2009 3:34 PM
> Subject: [Elecraft] K3 Filter Ring with Noise?
>
>
> > I've had my K3, which I assembled, about a month, outfitted with
> > 13kHz,
> > 6kHz,
> > 2.8kHz, and 400Hz filters. Thus far I've been exceptionally
> pleased with
> > all
> > aspects of the rig. I've read with interest the audio
> discussions of this
> > group. There is one area in which I'm not totally
> satisfied, but this may
> > be
> > due, partially, with my expectations of the rig.
> >
> > When using CW on noisy bands, meaning the sort of
> atmospheric noise we
> > often
> > are having now (NOT static crashes from storms), there
> appears to be an
> > audio
> > product as the bandwidth is narrowed which is annoying to
> my ears, which
> > occurs both in speakers and phones. This is basically like
> a ringing of
> > the
> > filters and especially evident as the passband is narrowed
> to 50-150Hz.
> > This
> > phenomenon is not a problem in quiet conditions nor if the
> station is
> > especially strong, but can overpower a very weak station.
> (I'm using a
> > pitch
> > of 600Hz for CW.)
> >
> > (I've tried eliminating the 400Hz filter to make certain
> there isn't a
> > problem there, and all is well with that filter, apparently.)
> >
> > I've been reducing RF gain and sometimes widening the
> passband to help
> > aleviate the problem, as well as using the NR. I've also
> modified the
> > RX equalizer from flat to settings of: #1=0, #2=3, #3=3,
> #4=-1, #5=-4,
> > #6=-5, #7=-8, #8=-10. Admittedly, part of these settings accomodate
> > SSB to give, what I hear, as a very pleasant sound for that
> mode. The
> > primary ranges of this noise are affected mostly by filters
> #4 and #5.
> >
> > If the RX equalizer settings remain flat, hence 0, the
> sound is even
> > more annoying. But remember this is really only in noisy
> conditions,
> > so my hypothesis is that the chaotic sounds in the noise
> are mixing to
> > produce what sounds like a ringing of the filters. (So not
> necessarily
> > the filters actually ringing, as we think of it.) But this makes
> > working very weak signals very difficult without widening
> the passband
> > quite a bit.
> >
> > So, guess I would like to hear comments regarding this, as well as
> > settings
> > and techniques people use to combat this phenomenon.
> >
> > 73 ...Edwin, KD5ZLB
> > ____________________________________________________________
> > "Once you have flown, you will walk the earth with your eyes turned
> > skyward, for there you have been, there you long to
> return."-da Vinci
> >
http://bellsouthpwp2.net/e/d/edwinljohnson> > ______________________________________________________________
> > Elecraft mailing list
> > Home:
http://mailman.qth.net/mailman/listinfo/elecraft> > Help:
http://mailman.qth.net/mmfaq.htm> > Post: mailto:
[hidden email]
> >
> > This list hosted by:
http://www.qsl.net> > Please help support this email list:
http://www.qsl.net/donate.html>
> ______________________________________________________________
> Elecraft mailing list
> Home:
http://mailman.qth.net/mailman/listinfo/elecraft> Help:
http://mailman.qth.net/mmfaq.htm> Post: mailto:
[hidden email]
>
> This list hosted by:
http://www.qsl.net> Please help support this email list:
http://www.qsl.net/donate.html