[Skimmertalk] Wandering skimmer

Pete Smith N4ZR n4zr at contesting.com
Tue Feb 18 07:15:32 EST 2014

Andy, I think you would be well-advised to put your question to Alex 
(alshovk at dxatlas.com).  Softrock-IF is designed, as the name suggests, 
to be used with a fixed center frequency Softrock SDR, and is limited to 
a 24-KHz bandwidth.  I know it has been worked around by some for use 
with a Flex, including VE2WU, but I do not know the details.

73, Pete N4ZR
Check out the Reverse Beacon Network at
blog at reversebeacon.blogspot.com.
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On 2/17/2014 10:22 PM, Andrew O'Brien wrote:
> 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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