On Tue, Nov 27, 2012 at 8:31 AM, nexy_sm <[email protected]> wrote: > Hallo people, > > During my adventure of designing 433MHz receiver i have recently discovered > misterious simetrical signal which I am not able to explain to myself. I am > using USRP1 with WBX daughter board. While observing complex baseband > signal, I realized that depenting on RF gain I have a signal simmetrical to > the transmitted signal. I have also attached a photo. > > Hope that you have some explanation. > > <http://gnuradio.4.n7.nabble.com/file/n38503/Screenshot.png> > <http://gnuradio.4.n7.nabble.com/file/n38503/Screenshot-1.png> >
Looks like the effects of IQ imbalance. I didn't read this closely, but this page looks like a pretty good explanation: http://www.dsplog.com/2009/03/08/iq-imbalance-in-transmitter/ Tom
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