Search Articles — Sudonull

https://sudonull.com/esp32-s3-internet-radio-code-and-schematic

Assemble internet radio on ESP32-S3 with UDA1334 and OLED. Full code, I2S connection, web interface. For middle/senior IoT developers.

https://sudonull.com/wspr-protocol-python-encoding-of-callsigns

Study the WSPR design for HF radio: 4-FSK modulation, data packing into 50 bits, code examples for callsigns and locators. Implement signal propagation analysis.

https://sudonull.com/spacex-starship-laser-data-transmission-system-2200-km-test

SpaceX tested laser communication on Starship for the first time without radio interference. Learn how this changes space communications and prepares a revolution by 2027. Read the analysis.

https://sudonull.com/quantum-effect-for-powering-chips-from-air-without-batteries

Scientists have discovered the nonlinear Hall effect in bismuth telluride, allowing microchips to be powered by radio signals. Learn about the technology that will rid sensors of batteries in the 6G era.

https://sudonull.com/tkinter-todo-search-filters-csv-export

Implement status filtering, real-time search and CSV export in Tkinter ToDo. Full code with Combobox, radio buttons and csv.writer. For middle/senior developers.

https://ymaho.com/what-is-the-gold-silver-ratio-and-how-to-use-it

Learn what is the gold silver ratio and how to use it to gauge market sentiment, identify relative value, and make smarter precious metals investment decisions.

Jun 18, 2025 ·

https://sciencenotes.org/radio-waves-or-radio-frequency-radiation/

Jun 18, 2025 · Radio waves are electromagnetic waves with frequencies below 300 GHz (wavelengths longer than 1 mm). Like all EM radiation they travel at the speed of light (c = 3.00×10 8 m/s) in a vacuum, but their long wavelengths give them unique propagation and interaction characteristics.

Aug 10, 2016 ·

https://science.nasa.gov/ems/05_radiowaves/

Aug 10, 2016 · Astronomical objects that have a changing magnetic field can produce radio waves . The radio astronomy instrument called WAVES on the WIND spacecraft recorded a day of bursts of radio waves from the Sun's corona and planets in our solar system.

Mar 4, 2026 ·

https://scienceinsights.org/what-are-radio-waves-types-uses-and-safety/

Mar 4, 2026 · Radio waves power everything from Wi-Fi to medical scans . Learn how they work, where they come from, and what the science says about their safety.

Jul 23, 2025 ·

https://www.geeksforgeeks.org/physics/radio-waves/

Jul 23, 2025 · Radio waves are a special type of energy that travels through space, carrying information without needing wires . They have the longest wavelengths in the electromagnetic spectrum, meaning they stretch out much farther than other waves like visible light or X-rays.

Electromagnetic spectrum - Wikipedia

https://en.wikipedia.org/wiki/Electromagnetic_spectrum

Radio waves , at the low-frequency end of the spectrum, have the lowest photon energy and the longest wavelengths—thousands of kilometers, or more. They can be emitted and received by antennas, and pass through the atmosphere, foliage, and most building materials.

May 4, 2026 ·

https://www.ico-optics.org/the-physics-of-radio-wave-generation-and-transmission/

May 4, 2026 · Radio waves are electromagnetic radiation . They move at the speed of light and carry energy through their wiggling electric and magnetic fields. Their behavior follows physical laws that explain how they’re created, how they travel, and how they interact with stuff around them.

Nov 9, 2025 ·

https://engineerfix.com/what-are-radio-waves-a-description-of-their-properties/

Nov 9, 2025 · Radio waves are an invisible form of energy transmission that moves through space and matter, making them the foundation of modern wireless communication. They possess a wave-like nature, oscillating through the air to carry signals that our devices can interpret.