CW Skimmer mirror images

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  • Updated 2 months ago
FLEX 6600M with SliceMaster and CW Skimmer:

I have had a problem with CW Skimmer that has come up recently that is best explained by displaying the screenshot. 



As you can see mirror images of the CW signals are being displayed. Both images decode but understandably, there is only audio from the center frequency. I did contact Alex VE3NEA, Skimmer's author and he responded quickly as follows:

Hi Terry,

I am not familiar with Flex 6000 and SliceMaster, all I can tell is that images appear when one of the I/Q signals is missing, or both signals are the same. The problem seems to be caused by some wrong settings, e.g. VAC configured for the mono mode, or a similar error in SmartSDR or SliceMaster.

73 Alex VE3NEA

Alex may be right on but I don't understand which is why I am posting it here.

Terry
K8EET







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Terry K8EET

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Posted 2 months ago

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K1DBO

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Terry,

This is usually related to driver corruption.  But it might not be that bad.  



Let's take a look at Alex's suggestion.  Can you verify that your DAX IQ devices are set to "2 channel" mode?

--Don

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Terry K8EET

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Don,

Thanks, Don that was the problem.
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K1DBO

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Great!  There's a good chance the other three IQ channels are set incorrectly too.  If you havent already, it might be worth a look.
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Mark - W6MSB

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This is great. I was having the same problem. Easy fix.

Should this also be the correct setting for other DAX devices, such as DAX Audio RX [x], DAX Mic Audio, etc? All of mine were set to 1 Channel. 

Don, awesome software! Thank you!

73,
Mark
W6MSB
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K1DBO

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You're welcome Mark!

As far as I can tell it doesnt really matter if the others are set to one channel or two.  I use a lot of multi-channel audio application and find that having the RX and TX devices set to one channel makes them a bit easier to deal with.  The information though is signal channel.  Setting it to two channel seems to just make the same information appear on both channels.

IQ, on the other hand, requires two channels... the I channel and the Q channel.  So for it to work properly, the driver must be set to two channel.

The big question here though, is why did it change?
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Mark - W6MSB

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Good question. In my case, this is a new computer build completed about a month ago. My OS (Win 10 Pro) and all apps were installed from scratch. I have been wrestling with the problem since the beginning, so I *think* in my case, the drivers were installed that way. Of course, that makes no sense, and I have no way of knowing for sure. My previous system did not experience the problem at all. If there's something I can check for you, let me know.