08-06-2012 11:01 AM
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
Solved! Go to Solution.
08-07-2012 10:58 AM
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.
08-07-2012 01:14 PM
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
03-13-2013 11:47 AM
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.
03-14-2013 04:14 PM
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