[USRP-users] power calibration

Marcus Müller marcus.mueller at ettus.com
Tue Jul 28 11:17:53 EDT 2015


Hello Claro,

I think you should take the "proper" calibration route.
I did that once for a N210/WBX, by using a R&S vector signal generator, 
a VNC server running on its Windows OS, and python on the laptop.

Best regards,
Marcus

On 28.07.2015 17:11, Claro Noda via USRP-users wrote:
> Hi.
>
> We are invested in a project which requires a power calibration of a b210.
> Namely, we need to translate complex arbitrary units in the uhd gr module
> to absolute power, for a given set of parameters, i.e. gain, sampling rate, etc.
>
>  From the AD9361 DS, I understand the chip has an internal RSSI calibration.
> However, I'm clueless whether one would obtain absolute power values from
> the uhd baseband signal, derived from any chip factory calibration.
>
> Alternatively, we are thinking of a calibration procedure, by running
> the B210 and
> some of the following equipment (through GPIB) from a python script:
>
> https://www.rohde-schwarz.com/en/product/smr-productstartpage_63493-7569.html
>
> https://www.rohde-schwarz.com/en/product/fsmr-productstartpage_63493-8032.html
>
> Thus, we end up with some matrix to derive absolute power values, using the
> equipment readings as a reference.
>
> Has somebody tried this? Is there some specific trick we need to know?
> Am I missing something?
>
> thank you.
>
> regards,
> Claro.
>
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