TX/RX caliberation utilities provided in UHD

GNU Radio
1

Hi

I would be grateful if anyone could explain more about the TX/RX
calibration
utilities provided by UHD:
uhd_cal_rx_iq_balance: uhd_cal_tx_dc_offset:
uhd_cal_tx_iq_balance:

a) I found them installed in one of the UHD directories. Not sure now,
but
wanted to know if the same version can be used on SBX and WBX
daughterboards. what changes in output should Ii expect to see.
How can I keep a note of it. are there any specific tests I can use.

b) What do these utilities exactly do.
c) do they write into the fw of the motherboard. if so, how can i remove
the
calibration if required.
d) what happens if a serial number is not present in the WBX boards.
e) application notes says: it creates a CSV file. how will it be stored
and
retrieved.

I am trying to use these utilities but before i do I just wanted to
clear my
doubts.

Any help will be appreciated.

Thanks
Gayathri

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2

Hi Gayathri,

this is not GNU Radio related – UHD is ettus’ driver framework for its
USRPs and only used by gr-uhd.

Most of your questions are answered in the UHD users Manual, see the
ettus website, http://code.ettus.com/redmine/ettus/projects/uhd/wiki
as well as in the man pages, usually available by invoking “man
uhd_cal_rx_iq_balance” (or the other program names, respectively)

just to answer the easy questions here:

a) yes, the same utility is used.
b) see the man page, and, if you really want to know in detail, the
source code. Basically, it measures TX leakage on the RX port.
c) no.
d) you’ll get a problem when connecting to your device, I think. You can
burn serial numbers, see the UHD manual. If you’ve bought hardware
without a properly flashed EEPROM, please contact ettus.
e) see the manual, calibration page.

Greetings,
Marcus