Re: [Discuss-gnuradio] Rx overflow problem related with sample rate

Hi,

These two threads discuss a similar problem, and the conclusion in both seems to be the host PC can not process the incoming samples fast enough.
http://gnuradio.4.n7.nabble.com/Overflow-error-even-at-lower-sampling-rates-td40214.html
http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2011-July/001774.html

I had the same problem, but adding a power squelch block, with a threshold just above my noise floor, fixed it.

On Sun, Mar 27, 2016 at 1:39 PM, SangHyoeg Kim <tkdgur7896@gmail.com> wrote:

Hi tom,

I got overflow when sample rate is over about 5M

As your recommend, my problem is threshold of Rx? 

(Rx grep all noise signal?)

2016. 3. 27. 오후 6:53 tom x <tomx4096@gmail.com> 작성:

Hi,

>I think my PC can handle this sample rate

Have you tried other rates? What's the highest sample rate before overflow occurs?

>How can I handle this problem ?

Maybe a power squelch block? You can filter out signals that don't meet a db threshold before they reach your PC.
https://gnuradio.org/doc/doxygen/classgr_1_1analog_1_1pwr__squelch__cc.html

On Sun, Mar 27, 2016 at 10:56 AM, SangHyuk Kim <tkdgur7896@gmail.com> wrote:

Hi,

I'm using USRP N210 with CBX daughter board on native Ubuntu 14.04

When I open fft_uhd with sample rate about 25 MSps, it spits out of "D"(overfow)

As I know, USRP N210 support sample rate up to 25 MSps and it's possible on Tx mode.

I think my PC can handle this sample rate, but I don't know why this is happened.

How can I handle this problem ? 

Thanks.

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