Jim, K9YC suggested some places to look that I hadn't thought
of. When I turned off the "Flatten" option in the waterfall
window, the noise bands went away. What I think is happening is
that the algorithm in wsjt-x that flattens the response for the
window sees the total lack of energy outside the K3's selected
band and boosts the levels of the signals and noise near it as
part of its compensation strategy.
73 Bill AE6JV
On 11/30/17 at 2:11 PM,
[hidden email] (Bill Frantz) wrote:
>I have a K3 which has been upgraded to have the Elecraft internal USB sound card.
>
>I tried adjusting the DSP bandwidth when running FT8 to
>eliminate a strong signal above the FT8 subband and noticed
>that there was a strong noise bar on the water fall for about
>400 Hz below the high cutoff. Further playing with the controls
>showed a similar noise bar just above the low cutoff. Note that
>these noise bars are in the requested pass band.
>
>Has anyone else observed this noise? Does anyone have an explanation?
>
>73 Bill AE6JV
-----------------------------------------------------------------------
Bill Frantz | Truth and love must prevail | Periwinkle
(408)356-8506 | over lies and hate. | 16345
Englewood Ave
www.pwpconsult.com | - Vaclav Havel | Los Gatos,
CA 95032
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