Concerning the last few days' discussion of noise and artifacts, here is a
spectral analysis plot of my K3's output:
http://www.qslnet.de/member/la3za/bilder/K3-CW-spectran.jpg
First it shows the signal related artifacts in the 10-13 kHz range as
mentioned by Wayne N6KR below. It also shows line
n...@mailman.qth.net] On Behalf Of Sverre Holm (LA3ZA)
Sent: 20 December 2009 13:13
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] K3 Receiver Noise Level -- Evaluation and
Adjustment
Concerning the last few days' discussion of noise and artifacts, here is a
spectral analysis plo
Sverre Holm (LA3ZA) wrote:
>
> Concerning the last few days' discussion of noise and artifacts, here is a
> spectral analysis plot of my K3's output:
> http://www.qslnet.de/member/la3za/bilder/K3-CW-spectran.jpg
>
> [snip]
>
> It is interesting to note that my spectran plot has discrete line
John Lemay wrote:
>
> I have deviated from white or pink noise, because most of the time we are
> listening to real signals (or qrm!). I decided to inject a signal: I used
> my
> K3 and XG1 to perform the test. The line out from the K3 was connected to
> line in on my PC.
>
> With reference to
> It seems to me that there is some non-linearity in the audio stages that
> sets in at a fairly low level. I'm not an expert either, but might the
> isolating transformers in the line output be the cause of this?
Yes, see Jack Smith's work on the topic
http://www.cliftonlaboratories.com/non-line
P.B. Christensen wrote:
>
> It appears your K3 has not yet been modified although don't expect a
> complete elimination of distortion products through the K3's transformers.
> The problem is not lmited to the K3: distortion produced in small, datacom
> transformers is dependent on the source
009 11:59 AM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] [K3] K3 Receiver Noise Level --
> Evaluation and Adjustment
>
>
>
>
>
> John Lemay wrote:
> >
> > I have deviated from white or pink noise, because most of
> the time we
> > are l
As others have stated, using the Line Out as a proxy for the headphone and/or
speaker outputs is probably not a good idea.
The only time it is valid is if you are using the Line Out into the same sound
card for digital modes.
Otherwise, if you are using headphones, you should be looking at the
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