alien_signal_or_meteor_scatter

Alien Signal or Meteor Scatter?

Aside from its conspiracy debunking nature, this video explains really clearly how meteor scatter and sporadic E works. I had to lookup what NTSC was though.

esp32_antenna_array_can_see_wifi

ESP32 Antenna Array Can See WiFi

From the youtube video description:

More information is available on the project website of the ESP32 antenna array “ESPARGOS”: https://espargos.net/

Source code for Python library + demos: https://github.com/ESPARGOS/pyespargos (directory “demos/camera” for “WiFi camera” demo)

As a research assistant at the Institute of Telecommunications at the University of Stuttgart, I work on multi-antenna systems like (distributed) massive MIMO, with a focus on wireless channel measurement platforms and algorithms for processing channel measurements (classical and deep learning-based).

One day, my (incredibly talented) colleague Marc Gauger suggested to use ultra low-cost ESP32 chips instead of software defined radios for channel measurements. I was highly sceptical at first, but when he showed me a minimalistic prototype he had soldered together, I was intrigued by the idea of being able to demonstrate my algorithms in real time using WiFi signals. In a series of Bachelor's / Research theses, my excellent students Tim Schneider, David Engelbrecht and David Kellner helped me develop the ESP32 antenna array “ESPARGOS”.

Measured CSI dataset used for AoA / TDoA visualization: https://espargos.net/datasets/data/es... AoA / TDoA localization source code (needs some minor modifications to be applied to espargos-0005 dataset): https://github.com/Jeija/ToA-AoA-Augm... Channel Charting source code for the animation in the video: https://github.com/Jeija/Geodesic-Unc... Tutorial on Channel Charting: https://dichasus.inue.uni-stuttgart.d...

My research on (distributed) massive MIMO, Channel Charting and other algorithms for multi-antenna systems is funded by the German Federal Ministry of Education and Research (BMBF) within the project Open6GHub (grant no. 16KISK019). I also want to express my gratitude towards ARENA2036, who hosted our measurement campaign for Channel Charting, and to my colleague and Channel Charting expert Phillip Stephan, with whom I co-authored several papers on Channel Charting and who assisted me with the creation of this video.

rtl-sdr_compatible_android_app

RTL-SDR Compatible Android App

Posted on Aug 23, 2025:

RF Analyzer V2.0 Released: RTL-SDR Compatible Android App.

I haven't tried it myself, but I thought it was worth spreading the word...

what_does_impedance_matching_actually_look_like

What Does "Impedance Matching" Actually Look Like?

This is a really cool video that shows what impedance means in terms of transient currents and potentials.

Sun Coast Amateur Radio Club Society - blog:2025-11-11