Amplitude convergence problem with SBX daughter board

[Whitecloud010]

Hello, everyone.

I am trying to measure the relative phase of continuous wave(CW) with N210 USRP. But the problem is when I use SBX daughter board, CW amplitudes slowly converge to zero(like SBX_figure.PNG). But when I use RFX900, this convergence didn't appear.

I used "GNU Radio Companion" and I disabled DC offset correction and IQ imbalance correction in "USRP Source" block. (see gnuradio.PNG)

If you know why this is happening, and how to disable it, please help me.

Thank you.

Whitecloud

[freeown]

USRP N210 is Ettus product.

You should contact Ettus Technical Support Team. 

https://www.ettus.com/support

[Whitecloud010]

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@freeown  작성:

USRP N210 is Ettus product.

You should contact Ettus Technical Support Team. 

https://www.ettus.com/support

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You are right. I should ask them about this, too.

By the way, aren't the NI and Ettus Research same company?

[freeown]

They might be produced from the same manufacturer but I am not sure the hardware is the same.

What I know is that they are running with different software. 

NI USRP is running with LabVIEW or LabVIEW Communications software.