Peter, I am seeing all kinds of nasty crud around DC, and so are many other SDR-1000 users. On some systems - maybe with some sound cards - maybe with better grounding - the problem is not very prominent. But for optimal (receiver) performance it's always safer to operate at some frequency offset instead of DC. (I haven't checked the source code lately so I'm not sure, but I think the current PowerSDR software actually uses "0 Hz IF" for TX.)
In general, I don't see why using zero IF would be significantly easier. The required calibration for image rejection can be a one-time operation if implemented properly. And you really do need to compensate for I/Q imbalance with zero IF, too. 73, Sami OH2BFO _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
