[Elecraft] eHam.net forum message

[Guy Olinger K2AV]

Would it be possible to add a function to the utility which creates a
file which lists all the K3 settings and configurations and control
settings when it is invoked?  Something that could be cut and pasted
into an email or attached?  This would be useful for many problem
resolve sessions.

I'm thinking that there are real issues here, solving or
identification made problematic by unintentionally fuzzy descriptions.
 IF this could be boiled down to a certain kind of signal and
precisely defined settings producing a widely agreed upon result,
there could be a resolution.  It is very hard to code solutions to
impressions, particularly it is not at all clear whether NR was on at
the same time, what settings were in use, and whether IF and/or DSP in
use for NB, etc, etc, etc.

Backing off PRE/ATT/RFgain settings in a noisy situation definitely
helps the "clarity" of DSP functions, but this tactic seems eternally
to fall on deaf ears.

It is clear in some posts that the term noise reduction is used when
the NB functions of the K3 are being addressed.

On the other side of this, I've never seen an analog radio nullify key
clicks.  I don't think we know everything that is possible with DSP
processing in the digital realm given time?   Very careful and precise
descriptions would be helpful.

73, Guy.

On Wed, Jul 14, 2010 at 2:54 PM, Geoffrey Mackenzie-Kennedy
<gm4esd at btinternet.com> wrote:
> Thanks for your explanation, I had missed the point of RLVZ's comment.
>
> A related cause and I am speculating here without doing the calculations,
> when the noise is rough and signals are at or under the noise floor might be
> the added in-passband low level intermodulation products generated by a
> narrow bandwidth roofing filter when hit by all of the received noise power,
> which the DSP then has to cope with, given that the OIP3 of a narrow
> bandwidth crystal filter is usually "worse" than that of a wider filter -
> all else being equal. I do have some crystal filter OIP3 vs filter bandwidth
> measured data which shows this effect, but will stop speculating on the
> effect on a DSP :-)
>
> I agree with your comment about DSP radios vs full analogue radios.
>
> 73,
>
> Geoff
> GM4ESD
>
>
>
> Tom W8JI wrote:
>
>> I think people are talking about two different things here.
>>
>> What I am talking about, and what I understand some others to be talking
>> about, is a problem with DSP systems processing noise floor signal,
>> especially when the noise is a bit rough, without adding artifacts that
>> make
>> copy or quality worse.
>
> <snip>
>
>> I have no problem at all with how the K3 blanker and noise reduction
>> works,
>> and actually IMO it does a good job for me. I just don't think any DSP
>> radio
>> is as good as a full analog system when signal levels are near noise
>> levels,
>> especially when the noise floor is a bit rough.
>
>
>
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