On 12/04/2018 12:07 PM, Rob Kossler via USRP-users wrote:
Does the X310 have any real-time DC offset calibration? I am aware of
the separate calibration procedure and resulting CSV file which
provides a lookup for the correction at a given frequency. But, this
is a fixed correction as opposed to a dynamic one.
I am seeing a large LO leakage signal at the beginning of a capture
but then the level gradually gets canceled as time progresses. This
is behavior i would expect of the B210 or N310, but not the X310.
DC real-time DC-offset correction has been a part of the "standard" FGPA
image for most USRPs since the USRP2. With UHD "Traditional"
(Non-RFNoC) you can turn it off. Not sure how you accomplish that
with RFNoC.
So, just wanted to double-check what I should be seeing prior to
spending too much time investigating.
I am using an X310/UBX with custom FPGA image which adds 2 FFT
blocks. I have my own c++ application linked to UHD master branch and
calling functions out of the RFNoC API to produce a Rx path of
Radio->DDC->FFT->host.
Rob
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