# Receive WiFi Signal with USRP N210

**URL:** <https://www.ruby-forum.com/t/receive-wifi-signal-with-usrp-n210/240648>\
**Category:** GNU Radio\
**Created:** [April 24, 2014, 6:33am UTC](https://www.ruby-forum.com/t/receive-wifi-signal-with-usrp-n210/240648 "2014-04-24T06:33:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [April 24, 2014, 6:33am UTC](https://www.ruby-forum.com/t/receive-wifi-signal-with-usrp-n210/240648/1 "2014-04-24T06:33:58Z")

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I try to receive the WiFi signal with 802.11n standard,and the grc as  
attachment.

It showed many “D”(overflow) in the terminal even at low sample rate  
(2M). I tried other two notebooks and use simple grc( uhd\_usrp\_source -\>  
file\_sink), but they are same. How to solve it?

There is the imformation about the set:  
freq = 2.412G, gain = 30, samp rate = 20M  
USRP N210 Dboard: SBX  
GNU Radio Version: 3.7.3

I tried to change net.core.rmem\_max & net.core.wmem\_max, and that isn’t  
solved the problem.  
(Besides, I need to use gr-ieee802-11 to get the AP address with 20M  
samp rate.)

Thanks.

---

<div class="post-metadata">

**Author:** ![r198947x](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/b77776/32.png) [@r198947x](https://www.ruby-forum.com/u/r198947x)\
**Post date:** [April 24, 2014, 10:14am UTC](https://www.ruby-forum.com/t/receive-wifi-signal-with-usrp-n210/240648/2 "2014-04-24T10:14:29Z")

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Is the problem caused by the Dboard (SBX)?

Bonnie