[USRP-users] IQ balance calibration problem

Christophe ALEXANDRE christophe.alexandre at cnam.fr
Mon Feb 20 11:30:09 EST 2012

Hi list,

i'm trying to use the calibration utilities with

N210, WBX, UHD 3.4.0, Ubuntu 11.04

i have troubles using :


1) if i use it with default options, i often get some errors
    while running : 

    Error : RunTimeError : no control response


    OError : Unexpected error code 0x8


    OError: did not get all the samples requested

    then the program stops.

    i have made some tests with 3 different PCs and 3
    differents N210.

    the only way to create successfully a calibration file
    is to reduce the number of samples from 10000 (default value)
    to 2000 or less.

2) my second problem is the efficiency of this calibration.
    i've created a QPSK test signal in order to visualize the correction
    with a scatterplot. The result of my tests is that the costellation is from far better
    without calibration than with it.


 Christophe ALEXANDRE     
 Conservatoire National des Arts et Métiers (CNAM)        
 Département EASY
 Accès 17-1-32, Case 2D2P10  
 292 rue Saint Martin 
 75141 PARIS CEDEX 03 
 email : christophe.alexandre at cnam.fr               
 tel. 0140272699 
 mob. 0651087311
 fax. 0140272994    
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