Tame your VNA
Ports, calibration, the Smith chart, an antenna to tune, a coil to measure: the network analyser step by step, up to the diploma.
Intermediate≈ 45 min6 levels
☆☆☆
F4IOZOlivier · radio amateur · JN18FS
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SAT LIVEDiscovery
Interactive episodes to learn radio hands-on: every idea can be seen, heard and tried, with Gamma, Kepler and Doppler to guide you. Your stars stay in your browser. Meet the trio · The games
Measuring & antennas
Gamma Measure before you cut: that's the golden rule. Here you learn measuring instruments and antennas.
Satellites
Kepler Orbits, passes, Doppler: all you need to catch a satellite. I've worked it all out. Nearly all.
The Doppler effect
A low satellite comes closer, passes, moves away: its frequency goes up, then down. With Doppler and Kepler, see why, hear it, and learn to correct it.
Beginner≈ 25 min6 levels
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LEO satellites
Height, period, ground track, footprint, AOS and LOS, elevation and azimuth, TLEs: with Kepler, understand how low satellites go round, and how to catch them.
Beginner≈ 25 min6 levels
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The ISS and radio
Coming soon: listening to the space station, its repeaters, its SSTV pictures, and the school contacts.
coming soon
Modes & operating
Doppler Modes and operating are coming soon! Meanwhile, my Doppler tutorial is filed with Kepler. He files everything.
More episodes will come here.
A history of communications
From wooden towers to the first radio waves: we go back in time, with real objects that move. And sources for every date.
The Chappe telegraph
1794: news crosses France faster than a galloping horse, without a single wire. With Kepler at the crank, Doppler running and Gamma on the stopwatch, work a Chappe tower and relay a message.
Beginner≈ 30 min6 levels
☆☆☆
The crystal set
Coming soon: the battery-free radio of the 1920s, told as an object of history — the crystal, the « cat's whisker », the coil. In France the last medium-wave transmitter fell silent on 31 December 2025: to hear those bands today, we'll listen on a WebSDR.
coming soon
First steps: the origins of wireless telegraphy
Coming soon: from Hertz's waves to Branly's radioconductor, from the Eiffel Tower to the first radio amateurs.
coming soon
Your stars are kept in this browser only. The site counts each level played, as for the games, keeping nothing that follows you.