'Re: [USRP-users] SBX 120 Calibration on Ettus X310'

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List: usrp-users
Subject: Re: [USRP-users] SBX 120 Calibration on Ettus X310
From: engineer1357 via USRP-users <usrp-users () lists ! ettus ! com>
Date: 2016-01-28 6:00:21
Message-ID: 20160128060051.VQBE10784.eastrmfepo101.cox.net () eastrmimpo306
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Yes, the non-RFNoC UHD and associated fpga version of calibration runs with no \
errors.   Thank you!
Paul

-----Original Message-----
From: "Marcus D. Leech via USRP-users" <usrp-users@lists.ettus.com>
Sent: ‎1/‎27/‎2016 10:51 PM
To: "usrp-users@lists.ettus.com" <usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] SBX 120 Calibration on Ettus X310

On 01/27/2016 10:38 PM, engineer1357 via USRP-users wrote:
> Hi, I'm trying to calibrate my two SBX 120 daughterboards in my Ettus X310, and I \
> get the following error, which is shown way at the bottom of this calibration \
> listing.  (I'm running Fedora 23 with the below UHD 3.10 RFNoC version.)  Anybody \
> have this error when calibrating and a fix???  My daughterboards seem to run fine \
> when running GnuRadio, but they definitely need calibration since they both produce \
> different levels with the same input.  The same problem occurs for all calibration \
> applications being: uhd_cal_rx_iq_balance,     uhd_cal_tx_iq_balance,      and      \
> uhd_cal_tx_dc_offset. 
> My Command:
> 
> > uhd_cal_rx_iq_balance  --args "addr=192.168.40.2"
> 
Two comments:

(1) Have you tried this in a non-RFNoC environment with a recent 
non-RFnOC FPGA and host-side UHD?

(2) Calibration is only about I/Q balance and DC offset correction.    
It is entirely normal for RF receivers to produce slightly different
   apparent received power for the same input power level--sometimes as 
much as 2dB or so.   For calibrated laboratory instruments,
   such as spectrum-analysers, and measurement receivers, extensive 
calibration tables are downloaded into tables in the device, and
   said devices must be re-calibrated against precision sources on a 
regular basis, as parts change characteristics--this is usually done
   at the factory.

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<html><head><meta http-equiv="Content-Type" content="text/html; \
charset=utf-8"></head><body><div><div style="font-family: Calibri,sans-serif; \
font-size: 11pt;">Yes, the non-RFNoC UHD and associated fpga version of calibration \
runs with no errors.&nbsp; Thank you! Paul</div></div><div dir="ltr"><hr>From: \
<a \
href="mailto:usrp-users@lists.ettus.com">Marcus D. Leech via \
USRP-users</a> Sent: ‎1/‎27/‎2016 10:51 PM To: <a \
href="mailto:usrp-users@lists.ettus.com">usrp-users@lists.ettus.com</a> Subject: \
Re: \
[USRP-users] SBX 120 Calibration on Ettus X310 </div>On 01/27/2016 \
10:38 PM, engineer1357 via USRP-users wrote: &gt; Hi, I'm trying to calibrate my \
two SBX 120 daughterboards in my Ettus X310, and I get the following error, which is \
shown way at the bottom of this calibration listing.&nbsp; (I'm running Fedora 23 \
with the below UHD 3.10 RFNoC version.)&nbsp; Anybody have this error when \
calibrating and a fix???&nbsp; My daughterboards seem to run fine when running \
GnuRadio, but they definitely need calibration since they both produce different \
levels with the same input.&nbsp; The same problem occurs for all calibration \
applications being: uhd_cal_rx_iq_balance,&nbsp;&nbsp;&nbsp;&nbsp; \
uhd_cal_tx_iq_balance,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
and&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; uhd_cal_tx_dc_offset. &gt; &gt; My \
Command: &gt; &gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
uhd_cal_rx_iq_balance&nbsp; --args "addr=192.168.40.2" &gt; Two \
comments: (1) Have you tried this in a non-RFNoC environment with a recent \
 non-RFnOC FPGA and host-side UHD? (2) Calibration is only about I/Q \
balance and DC offset correction.&nbsp;&nbsp;&nbsp; It is entirely normal for RF \
receivers to produce slightly different &nbsp;&nbsp; apparent received power for \
the same input power level--sometimes as much as 2dB or so.&nbsp;&nbsp; For \
calibrated laboratory instruments, &nbsp;&nbsp; such as spectrum-analysers, and \
measurement receivers, extensive calibration tables are downloaded into tables in \
the device, and &nbsp;&nbsp; said devices must be re-calibrated against precision \
sources on a regular basis, as parts change characteristics--this is usually \
done &nbsp;&nbsp; at the \
factory. _______________________________________________ USRP-users \
mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com </body></html>

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