[Skimmertalk] Wandering skimmer

Bob Wilson, N6TV n6tv at arrl.net
Mon Feb 17 21:53:39 EST 2014

Which device did you select for "Hardware type" in CW Skimmer?
 Softrock-IF?   3 kHz Audio?  Those are the only two modes that cause CAT
commands to be sent by CW Skimmer to the radio via OmniRig, unless you're
using another program like RigSync to do that.

When using Softrock-IF, notice how the Audio IF Frequency can only be set
in 50 Hz increments.  To what values is it set?

What radio type did you select in OmniRig?  Looks like CW Skimmer is
telling the PowerSDR to QSY, which moves the center frequency of the IF (or
maybe to nearest 50 Hz), so it ends up in a new place, which moves all the
signals.  Notice how the frequency at the top changes almost every time you

Maybe there is a QSY resolution limitation (PowerSDR center frequency can
QSY to nearest 100 Hz only when controlled by OmniRig)?

Is the CW Pitch setting in CW Skimmer the same as the CW Pitch setting of
the PowerSDR (500 Hz or ?).

Could be a CW offset issue.

Lots of variables to deal with in this setup.

Bob, N6TV

On Mon, Feb 17, 2014 at 4:52 PM, Andrew O'Brien <k3ukandy at gmail.com> wrote:

> Hmm, I have a wandering skimmer. Take a look at this
> http://www.youtube.com/watch?v=gzDn-brEkHE&hd=1 may be better to view full
> screen . At the beginning of the video CW Skimmer is working as it normally
> does. When I click on a skim, I start decoding it in the bottom window and
> the received signal is lined up with the green marker. It works fine at the
> top of the screen or when i click the bottom of the screen. Look what
> happens when I click on signals in the middle of the waterfall. When I
> click on the signal, nothing is decoded because the received signal climbs
> UP the waterfall each time! This is using CW Skimmer and PowerSDR 2.7.2 .
> Any idea ?
> Andy K3UK

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