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USRP B210, PLL did not lock

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Hi. 

 

I have a VI that can transmit or receive radio frequency broadcast over SDR. I use two USRPs B210. I made it possible for my VI to run in multiple instances. I use one instance for receiving with one USRP (let's name it usrp1) and second instance to transmit via usrp2. I have a problem that when I start decoding I get an error (but not all the times, like in 80%) that says:

 

Error -1074118625 occurred at niUSRP Initiate.vi

Possible reason(s):
The reference clock PLL did not lock within the allotted time

 

the error also occurs when I connect only one USRP and one instance. It also occurs only with one USRP. 

 

Can this be a problem with USRP and not my program?

 

Thanks

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