I just made two basic samples using K3 and TS-850 using Firebox
external soundcard and Winrad SW.
You can see screenshot from K3 line-out audio on
http://www.ok1kei.org/K3_audio/line_out_firebox_winrad.jpg
This is K3 with 400Hz roofing filter on some stable carrier.
LINE OUT setting on level 9.
Then the same signal with the same af level (no change in Firebox
input mixer settings) with TS-850
http://www.ok1kei.org/K3_audio/ts850_af_firebox_winrad.jpg
This is my TS-850 with 400Hz inrad filter and output from phones jack.
There are also some "ghosts" in af spectrum, generaly more noisy, but
no "image" of passband af signal visible.
As I do not believe in overloding of the Firebox soundcard (the same
conditions for both RIGs so if overloded so in both cases...), there
is something to explain.
Comments?
Thanks for your attention,
73!
Lexa, OK1DST
K3/10 #727
Alexandr Kobranov napsal(a):
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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