[Skimmertalk] Wandering skimmer

Alex, VE3NEA alshovk at dxatlas.com
Tue Feb 18 07:35:49 EST 2014

Hi Andy,

Is spur reduction turned off in PowerSDR?

73 Alex VE3NEA

On 2014-02-18 07:15, Pete Smith N4ZR wrote:
> 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
> http://reversebeacon.net,
> blog at reversebeacon.blogspot.com.
> For spots, please go to your favorite
> ARC V6 or VE7CC DX cluster node.
> 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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