[Skimmertalk] Wandering skimmer

Andrew O'Brien k3ukandy at gmail.com
Mon Feb 17 22:22:06 EST 2014

Pitch is 600 Hz in PowerSDR and in CW Skimmer.   Skimmer is set to use
Softrock-IF. Audio IF is 9600 , PowerSDR 9000.  I selected PowerSDR as the
rig type in CW Skimmer.  It is intesrting that is is only a problem with
signals in the middle.
Andy K3UK

On Mon, Feb 17, 2014 at 9:53 PM, Bob Wilson, N6TV <n6tv at arrl.net> wrote:

> 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
> click.
> 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.
> 73,
> 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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