Thank you for your response!
We need to use the sampling rate of 4 MHz. How can I deal with this problem? Actually we have been running the same application on several USRPs (N200 and N210), and there was no such warning. Any suggestions? Ting Wu From: Marcus D. Leech [mailto:mle...@ripnet.com] Sent: Monday, November 12, 2012 11:29 AM To: Ting Wu Cc: Discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Requested decimation is odd 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
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