Re: [Discuss-gnuradio] Requested decimation is odd

[Marcus D. Leech]

Hi all,

 

I am using USRP N200 with LFRX daughter board. The newest version of images has been loaded.

The sampling rate is set as 4 MHz. There is constantly a UHD warning:

 

The requested decimation is odd; the user should expect CIC rolloff.

Select an even decimation to ensure that a halfband filter is enabled.

 

How do I change the decimation value?

And what value should I set it?

 

Thanks!

 

Ting Wu

100e6 / 4e6 = 25

Which is odd value which changes the "line up" of filtering in the FPGA.

Select a sample rate that results in an even decimation value, unless you can live with the edge roll-off for an odd value.

-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org