Tx path problems with RFX-900

Hello,everyone

I have two problems about USRP Tx path as below:

1.General in the TX path,transmit data repeat again and again(I use
RFX-900 daughterboard),but in my reseach I need to transmit data one
period ,or after break some period,continue to transmit data.How do I do
it?

2.I want know Tx FIFO how full it is.Have any command or program script
in Gnuradio can show the FIFO state?


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