Second what Joe said...
On Tue, Dec 14, 2010 at 12:27 PM, Joe Subich, W4TV wrote:
>
> > If you have the 6-kHz filter installed, you can increase the
> > effectiveness of the DSP NB with some kinds of noise in SSB mode; just
> > set WIDTH above 2.8 kHz so this wider filter will be selected.
>
>
> If you have the 6-kHz filter installed, you can increase the
> effectiveness of the DSP NB with some kinds of noise in SSB mode; just
> set WIDTH above 2.8 kHz so this wider filter will be selected.
Or modify your configuration so the wider roofing filter is always
selected in SSB .
Wayne,
Your "In the absence of strong signals" caveat is a big one.
The entirely DSP key-click nullification works. I would think that if
a pulse is detected, and the wave shape of the pulse artifact after
filtering is known, that the known shape can be used in some digital
fashion to remove it. Or to
My comments apply to ONLY the IF (hardware) noise blanker. Sorry I didn't make
that clear, but I'm a hardware guy.
The reason for having the IF NB is that short-duration noise pulses, like the
ubiquitous power line noise, must be detected ahead of narrow bandpass filters,
which effectively len
The K3 has a dual methodology. 1) DSP and 2) traditional analog IF
pulse detection noise blanking which shuts off the IF for very short
intervals around the pulse.
Doesn't your commentary only apply to the IF NB methods of the K3?
The DSP methods take place in firmware, analyzing and adjusting th
Scott,
On Dec 14, 2010, at 8:28 AM, Scott Ellington wrote:
> The K3 noise blanker bandpass filter appears to have a bandwidth of
> about 400 kHz
> I'm just guessing, but it seems Elecraft took a different approach
> in using the very wide bandwidth. This increases the peak amplitude
>
The K3 noise blanker bandpass filter appears to have a bandwidth of about 400
kHz, so any strong signal within that bandwidth will affect its operation.
This is a problem with all noise blankers of this type, as they can't detect
noise pulses smaller than the strongest signal within the filter
ther radios? Maybe I got a bad pair.
> 73 Hardy N7RT
>
> - Original Message -
> From: "David F. Reed"
> To: "elecraft Reflector";
>
> Sent: Sunday, December 12, 2010 8:59 AM
> Subject: [Elecraft] K3 Questions and gripes
>
>
>> Hi folks;
If you look at the K3 schematic you can see that the noise blanker takeoff
point is at the output of the first post mixer amplifier. The bandwidth here
is necessarily wide. In the blanker itself, there is a double-tuned bandpass
filter at the input of the noise amplifier(s). I don't know what
tightened the
knobs when I built the radio.
Is this a problem with other radios? Maybe I got a bad pair.
73 Hardy N7RT
- Original Message -
From: "David F. Reed"
To: "elecraft Reflector" ;
Sent: Sunday, December 12, 2010 8:59 AM
Subject: [Elecraft] K3 Questions and
This is the way most analog noise blankers work. They look at a wide bandwidth
to detect
noise pulses and if there are loud signals in the range they can be interpreted
as noise.
The K3 has both an analog and a DSP noise blanker. If there are large nearby
signals, you
should reduce the aggres
On Sun, Dec 12, 2010 at 9:59 AM, David F. Reed wrote:
> ...with the NB on, when I noticed that I was getting a strong CW
> signal pumping
Dave, this is gonna happen with any noise blanker. When I turn on NB on my
Brand Y radio, I can hear artifacts from a medium strength CW signal 100
Hi folks;
Yes, I really love my K3 in spite of my questions and gripes; here they are:
1. During the 10 meter contest, I was up around 28.400 operating SSB
with the NB on, when I noticed that I was getting a strong CW
signal pumping my AGC (or so it seemed).
In doing a littl
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