Hi Marcus,
Thank you for the quick reply!
Is there any block in GRC that works with the FPGA in the USRP B210? And I have tried lowering the transition width from 1000 to ~150 but I still see overflow, does this means that the only solution to it is
to get a faster computer?
Thank you in advanced!
From:
Discuss-gnuradio [mailto:address@hidden]
On Behalf Of Marcus D. Leech
Sent: Tuesday, 22 May 2018 11:02 AM
To: address@hidden
Subject: Re: [Discuss-gnuradio] GNURadio Companion LPF
On 05/21/2018 10:54 PM, Yeo Jin Kuang Alvin (IA) wrote:
Hi all,
Apparently, I tried connecting the USRP Source to a Low Pass Filter and to a File Sink, I get overflows “OOOOOO”. However, when I removed the LPF, there is no overflow. The question is, why is this happening? Is the Low Pass Filter in GRC
done in the FPGA or in the computer itself? I am using USRP B210 and my sampling rate is 6MHz.
Is there a solution to this?
Thank you in advanced!
'O' are caused by the computer not "keeping up". Gnu Radio is a software-defined-radio framework, and all the
blocks execute on the PC host.
It is typically the case that new users make low-pass filters with very "aggressive" transition bandwidths, which leads to a very expensive-to-compute
filter. Try relaxing the transition bandwidth.