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: Main Signal The above image shows a marker (X) on the main signal at ~30MHz. Product 1 The above image shows a marker (X) at one mixing product at ~1.68GHz. Product 2 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
