Overflow error even at lower sampling rates

GNU Radio
1

Hi,

I am getting overflow error ,even at low sampling rates.I am using USRP
N210 device.If the sampling rate is less than 5MHz then there is no
error.I
know that USRP N210 can support at Max 25MHz.Can you please tell me what
might be the problem?

I just connected UHD source block to FFT sink in my example.

My system specifications.

OS :Ubuntu 12.10
processor :Intel Core i5-3570 CPU @ 3.40GHz 4
RAM 4GB

I am using 1Gbit Ethernet card.

Thanks

2

OS :Ubuntu 12.10
processor :Intel Core i5-3570 CPU @ 3.40GHz 4
RAM 4GB

I am using 1Gbit Ethernet card.

Thanks
Overruns are caused by your computer not being able to “keep up” in real
time with the dataflow from the USRP.

What happens if you use “uhd_fft” at the sames rates you’re getting
overflow with in your simple flow-graph?

–
Marcus L.
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

3

Hi Marcus,
I am not getting overflow,when i use uhd_fft. Can you please tell me
what
might be the problem.

Thanks.

4

On Thu, Mar 21, 2013 at 2:06 AM, john jade [email protected]
wrote:

Hi Marcus,
I am not getting overflow,when i use uhd_fft. Can you please tell me what
might be the problem.

Thanks.

All uhd_fft does is connect a USRP source to an FFT sink. Problems
arise when you add more blocks to your application that take more
processing time. The more CPU intensive the task, the harder it is to
keep up with the flow of data.

Tom