On 04/12/2011 04:44 AM, ton ph wrote: > Hi everyone , > I would like to know what is the actual last converted IF frequency > which is actually fed to the ADC in usrp/gnuradio , since ADC rate is > 64MS/s , I hope it IF should be less than 2xSampling rate of ADC, > which implies IF could not be 70Mhz. So what is the value of IF before > entering the ADC and what speed rate does the baseband is fed to the > ADC for samping. > Thanks in advance and also i apologize for any errrormatic information > in my post. > It depends on the daughtercard in use, but most daughtercards down-convert the desired center frequency to a complex baseband, centered at 0Hz.
There are execeptions. The original TV_RX used an IF of 5.75MHz, which was converted to complex baseband (I and Q) in the FPGA with a DDC. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
