dx offset for usrp x310

I would like to know the exact meaning of the result of the uhd_cal_tx_dc_offset for the USRP i am using. what is the significance of this.

does it mean, the peak at a certain frequency i am getting for range profile is not the true frequency?

kindly explain.

Answer 1

[Ousman Sadiq]

Thanks for your question,

These calibration tools are devloped and shipped by Ettus Research, and we would refer to their documentation to understand how to use their tools and what the output means. The relevant link is here

Kind regards,

Ousman

[MOHAMMAD NADIM]

Thanks for the response.

By the way, that warning of "Could not find block with Noc-ID" is a serious issue for the correct functioning of USRP?

[Walter Roberson]

Possibly relevant: https://www.mail-archive.com/[e-mail]/msg14194.html

[MOHAMMAD NADIM]

i noticed one explanation to rectify this in the portal you sent which is- " To alleviate this, you need to set the UHD_MODULE_PATH environment > variable to the path where your out-of-tree library for this block is > located" I could not understand it. Kindly explain.

[Walter Roberson]

My interpretation is that the message is saying that there is a block with identifier 0xffda7703 that has no definition in the libraries that are normally linked to, so you need to setenv UHD_MODULE_PATH to a directory that contains a definition of block with identifier 0xffda7703 (and the other block as well)

At the moment I do not have any idea how to identify some kind of name for block with identify 0xffda7703 so I do not have any idea which block is being referred to.

(I have never used USRP and have never had access to any of the relevant products; I just sometimes get lucky when I google things.)

[MOHAMMAD NADIM]

How can we compensate this offset?

[Ousman Sadiq]

For the error "Could not find block with Noc-ID", this is not a serious error: This bitstream is a custom bitstream from "Wireless Testbench" product and should be used by that product and the associated "Wireless Testbench Support Package for NI USRP Radios".

My understanding is the the tool uhd_cal_tx_dc_offset performs a calibration routine and generates these .cal files.