Maybe only short reminder - "ghosts" are surely from K3 as the same
signal with the same audio level to the same card was without "ghosts"
when delivered from other RIG. (TS-850 in my case)
Hope it was registered in Elecraft.
(Why "ghosts" and not only "harmonic distorsion"? - There are reported
PSK31 ghosts readable/detectable as valid PSK signals so it in not
non-linear harmonics behaviour...imho)
73!
L. -dst-
Julian, G4ILO napsal(a):
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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