While uncalibrated LO leakage has never been great in the UBX for us, the dc offset calibration procedure has given us adequate enough improvement. We’re generally using offset tuning, but we still need that extra 15-20 dB suppression we get from the calibration procedure.
The issue we’re seeing with these newer Rev C boards, though, is that the calibration doesn’t just fail to improve LO suppression; it actively makes it worse. Offset tuning is pretty fruitless when the LO spur alone is >0 dBm at the mid-point of available RF gain. From: ROBIN TORTORA <ti...@comcast.net> Reply-To: ROBIN TORTORA <ti...@comcast.net> Date: Thursday, April 19, 2018 at 1:44 PM To: "Stanley, John P. via USRP-users" <usrp-users@lists.ettus.com>, "Stanley, John P." <john.stan...@jhuapl.edu> Subject: Re: [USRP-users] DC Offset Calibration Issue for Rev. C UBX-40 daughter cards
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