Pulse modulated CW with PXI-5650 and PXI-6653

[Jendzurski]

Hello,

I am trying to generate a pulse modulated CW signal with the PXI-5650 as the RF source and the PXI-6653 as the modulating signal. Basically I am trying to generate a simple radar waveform. It seems like this would be possible to use the Timing Module (6653) to turn the RF output on/off on the Signal Generator (5650), but I am not sure how to route signals from one to the other using LabView.

Has anyone tried this or something similar before? Can anyone please offer some advice?

Thanks!

-John

[A_Donfigulation_Error_Has · Accepted solution]

Hi John,

From reading your post, it sounds like you want to use your timing and sync card to turn the RF output on/off, in others words, On Off Keying. OOK modulation is a built-in feature to the 5650. For more information, you can navigate in the NI RF Signal Generators Help to Devices -> NI RF Signal Generators -> NI 5650/5651/5652 Overview -> Modulation Modes, and just click on Modulation Modes. 

An example of this can also be found in the NI Example Finder by navigating to Help -> Find Examples... in LabVIEW and then navigating in the NI Example Finder to Hardware Input and Output -> Modular Instruments -> NI-RFSG -> Modulated Waveforms -> RFSG 565x Digital Modulation.vi.

Regards,

Jason L.

[Jendzurski]

Hi Jason,

Yes, that's exactly what I'm trying to do. I did not realize that OOK was built in to the 5650. That's great!  Thanks for your response and the clear explanation on where exactly to find the example vi's.

-John

[Eric_001]

Hello,

How is pulse modulated CW done with PXIe-5673E vector signal generator.  I cant seem to find any examples in labview.  The only information I found is using PXI-5652(signal generator) only.

Any help is greatly appreciated.

[dbell0971]

Hi Eric,

What kind of modulation do you want to do?  The 5673E is not compatible with the examples listed previously; however, the 5673E has the ability to generate an arbitrary waveform.  Are you looking to perform OOK?  You could create a waveform that writes pulses at whatever frequency you desire.

In this case, I would recommend starting from either "RFSG Arbitrary Waveform Streaming.vi" or "RFSG Write Waveform From File.vi".  These can be found in the LabVIEW example finder at:

Hardware Input and Output -> Modular Instruments -> NI-RFSG -> Modulated Waveform Generation

Best Regards,

David B

National Instruments

Applications Engineer