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Stepped frequency Radar using 5644R

Hi

 

I am trying to generate a stepped frequency radar using a single 5644R. I am using an external trigger connected to the PFI0 port to trigger the generate and acquisition chains. I am using the Spectrum Acq and Arb waveform Gen example, as a starting point. Currently I have a triggering issue as I need the generation and acquisition to start at the same time, which is not happening. I have made sure that the Pulse width of the digital signal is much larger than the size of the generated waveform but it seems like the system is still being triggered before a generation is complete. The attached figure shows a snippet of the current set up. Does it matter where the start digital SubVIs are placed? 

 

Any suggestions will be greatly appreciated

 

Thanks

 

 

 

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