Mike Scott-7 wrote:
>
>
> Bob, some of us have measured distortion on the line out connection on our
> K3s and find that it is significant on high line-out drive levels. I think
> the manual suggests nothing higher than 10. Mine has noticeable artifacts
> on
> a waterfall with a single tone RF input from an XG2 signal generator with
> any line-out gain setting above 3. Luckily that is just enough to drive my
> internal soundcard, YMMV.
>
>
I noticed "ghost" CW signals at a multiple of the audio frequency, using CW
Skimmer, when the line out setting was set above 2. It was only noticeable
when using narrow filters, so the noise level at the frequency where the
spurious signal fell was very low. It even confused CW Skimmer, copying the
same call on two different frequencies.
When the filter bandwidth was opened up, as I imagine most people using
Skimmer would do, band noise masked the "ghosts".
Cw Skimmer is very sensitive and will work at a low audio level. Other sound
card programs really need a line out level of 10 or more.
I don't have measuring equipment so I have been unable to determine whether
the fault is in the K3 or the on-board Realtek sound chip in my shack PC,
but it does warrant further investigation.
-----
Julian, G4ILO. K2 #392 K3 #222.
http://www.g4ilo.com/ G4ILO's Shack http://www.ham-directory.com/ Ham
Directory http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3
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