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:address@hidden]
Sent: Monday, November 12, 2012 11:29 AM
To: Ting Wu
Cc: address@hidden
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