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