[Elecraft] SDR-IF and I/Q questions

[John Ragle]

The Infrasonic Quartet card (stereo, 192 kHz) comes with a small applet, 
called "FREEMIXER Panel," that works outside of the WIN sound management 
system. This helper app allows one to independently play with the levels 
(not the phase) of the incoming I/Q stream. I imagine other fast cards 
come the same way. Several of the SDR programs also have an "image 
killer" available. I am guessing when I say that this "image killer" 
works by adjusting the phase (time delay)...the ones I have used are 
offset-specific WRT the particular image that is removed.

John Ragle -- W1ZI

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On 11/11/2011 8:11 AM, Don Wilhelm wrote:
> (snip) ...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...