[Elecraft] K3 #1456 - data modes setup

[Alexandr Kobranov]

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.
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