On 04/22/2011 01:54 AM, ton ph wrote: > > Hi guys , > I am using DBSRX , now i am trying to trace the data flow in the > usr-gnuradio . I see AD9862 ADC in the usrp and some of the block > diagrams , and i think that the daughterboard > passes the analog signals to the ADC in the I and Q format . Please > guide me if this is right or wrong ... Thanks . > That is precisely correct, yes. Most daughterboards use an analog quadrature mixer to produce a complex (I and Q) baseband signal.
The TV_RX is one that *doesn't* -- it's a conventional superheterodyne receiver, with a final IF frequency of (as I recall) 5.75MHz, which is passed to a single ADC channel, and the FPGA mixes it down to a complex baseband digitally using a digital quadrature mixer. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
