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Re: [Discuss-gnuradio] Requested decimation is odd

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Requested decimation is odd
Date: Sun, 11 Nov 2012 21:28:46 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16

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?




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

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