The UHD sink has a sample rate parameter. Your whole graph will be
“paced” by that parameter. Make it whatever you want, subject to
the usual restrictions that it must be a proper decimated rate from
the basic sample rate.
What device are you using?
For N2XX, the basic rate is 100e6 so sample rates have to be a proper
integer fraction of that rate
For B100/E100/USRP1 the basic rate is 64e6
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