On 11/11/12 09:42 PM, Ting Wu wrote: > > 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:[email protected]] > *Sent:* Monday, November 12, 2012 11:29 AM > *To:* Ting Wu > *Cc:* [email protected] > *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 The warning is new. But nothing else has changed. If your application has been running fine, it will continue to run fine.
-- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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