We have a number of old flowgraphs that take advantage of quadrature sampling and work fine in USRP1 non-uhd, but once converted to UHD (for USRP1 and 2), we've been wholly unable to come up with subdev specs that work- the I and Q are not synchronized in any way and any change in frequency changes the relative phase between I and Q. The main flowgraphs we're trying to convert are Charles Swiger's VNA and related flowgraphs from http://swigerco.com/gnuradio/index.html . Can anyone offer some proven working flowgraphs, or reduced version of them, for UHD that depend on quadrature sampling at the USRP (LFRX or BasicRX) as an example to us?
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