# UHD Announcement - November 16th 2011 **URL:** \ **Category:** GNU Radio\ **Created:** [November 16, 2011, 9:12pm UTC](https://www.ruby-forum.com/t/uhd-announcement-november-16th-2011/213940 "2011-11-16T21:12:04Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![luislavena](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/0ea827/32.png) [@luislavena](https://www.ruby-forum.com/u/luislavena)\ **Post date:** [November 16, 2011, 9:12pm UTC](https://www.ruby-forum.com/t/uhd-announcement-november-16th-2011/213940/1 "2011-11-16T21:12:04Z")
Hello list, Recall from my previous announcements that addition of correction registers and API for DC offset and IQ balance. Well, now you can use special calibration utilities that come with UHD to improve RF performance for WBX and SBX better than the out of the box specs. So, I just merged these self-calibration utilities into the master branch. These utilities can be used to minimize IQ imbalance and DC offset through calibration adjustments. The calibration is automatic, just run the utils, correction factors are saved and applied at runtime. Currently, only SBX and WBX are supported. The utilities will not run on USRP1, because it lacks the necessary FPGA fabric. More details and instructions for how to use can be found here in the application notes: [http://files.ettus.com/uhd\_docs/manual/html/calibration.html](http://files.ettus.com/uhd_docs/manual/html/calibration.html) If you plan on using the IQ balance calibration utility, I recommend grabbing the latest images from here. Basically, these new images have some tweaks to the dynamic range of the correction registers. [http://code.ettus.com/redmine/ettus/projects/uhd/wiki#Binary-downloads](http://code.ettus.com/redmine/ettus/projects/uhd/wiki#Binary-downloads) Happy calibrating, -Josh ---
**Author:** ![Josh\_B](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/8797f3/32.png) [@Josh\_B](https://www.ruby-forum.com/u/Josh_B)\ **Post date:** [November 18, 2011, 10:54pm UTC](https://www.ruby-forum.com/t/uhd-announcement-november-16th-2011/213940/2 "2011-11-18T22:54:59Z")
Hi Figured it out myself WBX didn’t have serial number in eeprom so I used usrp\_burn\_db\_eeprom to create it. Thanks Josh great calibration utillity tempest@ubuntu:/usr/local/share/uhd/utils$ ./usrp\_burn\_db\_eeprom –id=0x0052 --unit=TX --ser=146 linux; GNU C++ version 4.4.3; Boost\_104000; UHD\_003.004.000-65b6acc – Opening a USRP2/N-Series device… – Current recv frame size: 1472 bytes – Current send frame size: 1472 bytes Reading TX EEPROM on A dboard… Current ID: WBX (0x0052) Current serial: “146” Current revision: “” Done tempest@ubuntu:/usr/local/share/uhd/utils$ ./usrp\_burn\_db\_eeprom –id=0x0053 --unit=RX --ser=146 linux; GNU C++ version 4.4.3; Boost\_104000; UHD\_003.004.000-65b6acc – Opening a USRP2/N-Series device… – Current recv frame size: 1472 bytes – Current send frame size: 1472 bytes Reading RX EEPROM on A dboard… Current ID: WBX, WBX + Simple GDB (0x0053) Current serial: “146” Current revision: “” Done ---
**Author:** ![Josh\_B](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/8797f3/32.png) [@Josh\_B](https://www.ruby-forum.com/u/Josh_B)\ **Post date:** [November 18, 2011, 8:22pm UTC](https://www.ruby-forum.com/t/uhd-announcement-november-16th-2011/213940/3 "2011-11-18T20:22:29Z")
Hi I am trying the calibration programs on my USRP2 with WBX board and they all give an error: Error: RX dboard has empty serial! The verbose output is below. Thanks for your effort this will really help my application. David tempest@ubuntu:~/Documents$ uhd\_cal\_rx\_iq\_balance --verbose linux; GNU C++ version 4.4.3; Boost\_104000; UHD\_003.004.000-65b6acc Creating the usrp device with: … – Opening a USRP2/N-Series device… – Current recv frame size: 1472 bytes – Current send frame size: 1472 bytes RX IQ: 78.749809 MHz: best suppression 69.127581 dB, corrected 13.330759 dB RX IQ: 86.049870 MHz: best suppression 68.840208 dB, corrected 15.483059 dB RX IQ: 93.349931 MHz: best suppression 68.952237 dB, corrected 16.616805 dB RX IQ: 100.649992 MHz: best suppression 67.945456 dB, corrected 17.176162 dB … … RX IQ: 2173.849206 MHz: best suppression 69.625957 dB, corrected 39.116919 dB RX IQ: 2181.147741 MHz: best suppression 69.841937 dB, corrected 39.452520 dB RX IQ: 2188.449328 MHz: best suppression 69.643630 dB, corrected 39.248418 dB Error: RX dboard has empty serial!