Re: [Discuss-gnuradio] decimate by less than 8 in standard FPGA of USRP

[Firas A.]

Hi,


1) Just use USRP FPGA file (firmware) that contains no halfband filter as in
the following example:

decim = 4
set_fpga_filename="std_4rx_0tx.rbf" # This FPGA firmware contains 4 Rx paths
without halfbands and 0 tx paths.
u = usrp.source_c(0, decim_rate=decim, fpga_filename=set_fpga_filename)


2) See:
usrp_fft.py


Note:
In this case (decimation by 4), you must use 8 bit data format (see the
option -8 in usrp_fft.py) to avoid saturating the USB bus.



Firas
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