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USRP x410 Synchronization Problem in GNU Radio

Hi everyone,

 

I'm facing a problem for the transmission with x410 board in GNU Radio. My goal is to transmit two identical signals using two different channels.

 

To check whether the two signals are synchronized, I set both channels to the same center frequency (3.6 GHz) and the same sampling rate (30.72 MHz).

However, when observing the output in the data analyzer, I found that the two signals are not synchronized, and the delay between them varies each time.

 

In the attached files, the terminal result shows the transmission results, and schema1 illustrates how the transmission flowgraph is constructed.

 

Note: I am using the same O/B GPSDO as the internal clock source.

 

Thank you for your help!

 

Best regards,

Yang

 

 

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