[Elecraft] SDR-IF and I/Q questions

[Richard Fjeld]

Don,  (responding to your paragraph below)

Here is where I have been at for awhile.  I have tested the output on the I/Q leads with a O-scope and they are certainly close.  Rocky verifies that, and shows them within a dB.  WinRad shows 90 degree phase, (and no mirror images).

Neither my soundcard, nor my SoftRock have adjustments for balancing the I/Q leads further. It would be nice if the Audio Mixer Software did this. I wonder if some do?  

So having a soundcard that provides for balance may be the focal point for the solution to this problem. (Provided that ground loops do not exist.)

Thanks again,
Dick, n0ce


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Dick,    The cause of mirror images is normally associated with the two audio 
signals not being of equal amplitude and/or not 90 degrees out of phase 
when they enter the "number crunching" part of the software.  Yes, 
"ground loops" can cause that, but check your cables for integrity and 
be certain the volume controls for the "left" and "right" channels are 
producing the same amplitude input.  Some experimentation with the level 
controls may be necessary.  73,   Don W3FPR
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Richard Fjeld
rpfjeld at embarqmail.com
I'd rather be learning.