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USRP 2901 TX Multiple output (Single Device, Multi channel) -> Phase of sinusoidal waveform not changing continuously

Hi,

I am quite new to Ni USRPs. Please help me resolve my problem.

 

Scenario: I am using four channels (RF0 and RF1) of USRP 2901 for transmission and reception of sine waves. My goal is to transmit two tones: one from TX1/RX1 port of RF0 while second from TX1/RX1 port of RF1 with different phases between these two tones in continuous manner. I know the default settings in the example 'TX Multiple output (Single Device, Multi channel).vi'. However, i want to control the phase between two tones by changing it from the front panel. For this purpose, I put the complete code of the given example in a for loop and gave an array of different phases, from outside of the array, to the phase terminal of anyone tone.

 

Problem: Whenever i run the vi, the waveform graph shows sine waves only corresponding to first value in the array of phases. The graph does not show the phase difference corresponding to the remaining phase values in the array. I dont know why it is happening.  

 

Please suggest me any solution. Thank you in advance

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