niUSRP Signal.vi set not allowed inside loops?

It seems that niUSRP than signal.VI set is not allowed in loops. After the decision of the VI, I get this message:

niUSRP configure Signal.vi, this attribute cannot be changed while the driver is in the operating state.

Is there a way to change the frequency of the carrier, while the driver is running? With the help of property Node.vi of niUSRP to set a new frequency within a loop is also not working. My goal is to create with the USRP to frequency hopping.

Hi YYY.

Thanks for your VI, including in the post.  I was able to download it and reproduce what you see.  There are a few things that need to be changed in order to get this to work.

First of all, you don't need to have the niUSRP function to configure Signal.vi inside your time loop.  You can put this outside the loop and a property node allows you to change the frequency with a property node.  You already have the property node in your code, you just need to change it to write instead of read.  There is an example that will do just that, if you just want to use it instead of modify your code too much.  It's called niUSRP EX Tx continuous Async Reconfig on the Fly.vi.

Then, the reason why you are not able to go at the rate of 1 ms/s IQ with the code you have is because you're trying to read and write the frequency during each iteration of the loop.  Because of the time to query the hardware, set the frequency and read the return frequency, the I was able to get the maximum rate of IQ was around 500kS/s.  This is due to a combination of hardware and driver limitations.  Even with the example above uses the property instead of the function of the configuration node, if I put in an indicator to look at frequency I can't use a faster speed of the IQ.

Try to change the property node and the withdrawal of this indicator, you should have a lot more success.  Let me know if this does not work for you or if you have any other questions, I'd be happy to help you.

Tags: NI Products

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