Hi Christian,
Use command port in USRP source to control center frequency. I've build a
frequency sweeper that can change center frequency automatically using
message strobe and python block that connected to USRP command port.
This page may helpfull for your problem
http://gnuradio.4.n7.nabble.com/Change-frequency-in-USRP-source-automatically-td58751.html
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