I/Q balance with DSP Radio (OS X)
- Hi everyone.
Well I am currently assembling a RXTX Ensemble kit.
I have finished the stage 7 so I wanted to test the receiving capability.
Computers I used here are under Mac OS X (Snow Leopard).
I used DSP Radio software from Sebastian DL2SDR (nice callsign BTW).
Si570 control is ok and basic receiving also.
The only PC under Windows is the one of the accountant, but not easy to drag it close to the antenna...
I was able to decode many signals CW, USB and for the first "see" the chinese OTH.
It was my first experience with a SDR receiver and it was pleasant.
My problem is that I have an image that I am unable to get rejected. It is perhaps 75% as strong as the main signal.
I checked my SoftRock, the cables and it seems ok.
I tried on an iMac (Core 2 Duo 2,4GHz) and a Dell Mini 9 (ATOM N260), both under OS X with 24 bits / 92KHz sound cards.
I checked turning on and off, swapping, left and right channels and no signs of improvement.
I tried to modify the "alpha" and "epsilon" parameters without success...
I tried to run Rocky under VirtualBox. It is running ok but I think audio emulation adds some delay in the audio treatment and sample rate is limited to 48KHz (AC'97 specs).
Phone USB decoding is a bit distorted...
Does anyone has an idea ? Hidden OS parameters for "sound mixing" ?
Is any other software that I can try ?
Does Rocky works with Wine on OS X ?
Thanks by advance for your help.
Yannick DEVOS - XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)