# Need Tx/Rx loopback test for USRP2 with a wbx daughter board

**URL:** <https://www.ruby-forum.com/t/need-tx-rx-loopback-test-for-usrp2-with-a-wbx-daughter-board/193126>\
**Category:** GNU Radio\
**Created:** [August 11, 2010, 7:58pm UTC](https://www.ruby-forum.com/t/need-tx-rx-loopback-test-for-usrp2-with-a-wbx-daughter-board/193126 "2010-08-11T19:58:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Mark\_Hemmerlein](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e36b37/32.png) [@Mark\_Hemmerlein](https://www.ruby-forum.com/u/Mark_Hemmerlein)\
**Post date:** [August 11, 2010, 7:58pm UTC](https://www.ruby-forum.com/t/need-tx-rx-loopback-test-for-usrp2-with-a-wbx-daughter-board/193126/1 "2010-08-11T19:58:08Z")

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Hi

I now have a USRP2 with a wbx daughter board up and working under Ubuntu  
(  
usrp2\_fft.py ). I would like to perform a transmit / receive loopback  
test to  
verify transmit as well as receive. Is there a program or utitility  
which  
may perform this function?

gnuradio newbie  
mark

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**Author:** ![Mark\_Hemmerlein](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e36b37/32.png) [@Mark\_Hemmerlein](https://www.ruby-forum.com/u/Mark_Hemmerlein)\
**Post date:** [August 11, 2010, 8:02pm UTC](https://www.ruby-forum.com/t/need-tx-rx-loopback-test-for-usrp2-with-a-wbx-daughter-board/193126/2 "2010-08-11T20:02:49Z")

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On 08/11/2010 10:55 AM, Mark Hemmerlein wrote:

> Hi
> 
> I now have a USRP2 with a wbx daughter board up and working under Ubuntu (  
> usrp2\_fft.py ). I would like to perform a transmit / receive loopback test to  
> verify transmit as well as receive. Is there a program or utitility which  
> may perform this function?

Don’t put a cable between the tx and rx.

Matt

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<div class="post-metadata">

**Author:** ![Mark\_Hemmerlein](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e36b37/32.png) [@Mark\_Hemmerlein](https://www.ruby-forum.com/u/Mark_Hemmerlein)\
**Post date:** [August 11, 2010, 9:30pm UTC](https://www.ruby-forum.com/t/need-tx-rx-loopback-test-for-usrp2-with-a-wbx-daughter-board/193126/3 "2010-08-11T21:30:38Z")

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I just plug the wbx to simple antennas, matched to the frequency you  
want  
to transmit/receive.  
And as Matt said, do not blow your board, don’t connect tx to rx.