Hello,

Do you like software defined radios?  Do you like digital communications?  Me too!

I took a Ubiquiti XR3 radio modem configured to operate in NV2 mode with 20MHz bandwidth centered at 3.65GHz, and mixed it with a 3.68GHz local oscillator.  The resulting unfiltered mess got fed to my oscilloscope which digitized it into the attached file.  The sampling rate was 250MSa/s and the capture length was 32768 samples.  The data in the file represents a single NV2 beacon transmission, which lasts about 84us.  The captured signal should be centered at 30MHz with a 20MHz bandwidth.  Having looked at the signal in the frequency domain before digitizing it in the time domain, I can tell you there are some unwanted mixing products here along with the desired signal:


The above image shows a marker (X) on the main signal at ~30MHz.




The above image shows a marker (X) at one mixing product at ~1.68GHz.



The above image shows a marker (X) at another mixing product at ~2.0GHz.

Can you extract the data from this beacon frame?  The outermost encoding should be 20MHz 802.11a OFDM.

--Bart