I can confirm cca 20dB lower level of 3rd harmonics on front panel
phones output against rear panel line out. Main versus 3rd harmonics
is 50dB resp. 7OdB on line-out resp. phones output here.
Just tried with on-board sound card od my Dell workstation.
(using Spectran SW and output level adjusted for the same peak out
level on Spectran screen).
Maybe later will try with Firebox sound card which has better parameters.
Lexa, ok1dst
Joe Subich, W4TV napsal(a):
There is still a bit of a problem on receive audio. This has
been there for some time and exists in the form of harmonics.
The 3rd harmonic is quite easy to see and repeatable. I
used HRD to show this on the waterfall after a conversation
with a friend. You can clearly see the harmonic at..
You are overdriving your sound card or the line out transformer
in the K3.
I have measured the third harmonic using an audio spectrum analyzer
at both the line out and headphone jacks of my K3. Until the level
becomes excessive (> .7V RMS on the Line Out) the third harmonic is
more than 50 dB down (Line Out) and more than 70 dB down (headphones).
73,
... Joe, W4TV
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