Hi all Newbie here. I am using FLEX 2400 daughterboard with USRP. On the exploring GNUradio
web page it is mentioned under the title "what goes in FPGA" that there
is a NCO and Decimation filter in FPGA. I did a quick scan of the FLEX
2400 receive schematic and it appears to me that it is a direct
conversion receiver. So if it is a direct conversion receiver with the
demodulation and filtering bringing the signal to baseband, why do we
need the NCO and Decimation filter in the FPGA? Please correct me if I
have interpreted this incorrectly.