The information provided on this website is provided for reference purposes only, No warranty is provided for its use. You should check information provided with independent data sources before using…
https://www.astronomy.me.uk/wp-content/uploads/2026/01/Plan-Measurements-for-LRO-Horn-of-Plenty-140126.pdf
Click on link below to download Alex Pettit’s PDF document on dark frame correction options in hydrogen line radio astronomy for amateurs. https://www.astronomy.me.uk/wp-content/uploads/2026/01/Alex-Pettit-Dark-Frame-Correction-v04-141125.pdf
Principle behind the design: Reversing the perspective: First and foremost, the conceptual approach is reversed. It is not that “the components of a geodesic structure form a natural parabola,” but…
A geodesic dome doesn’t actually form a parabola—but it very often looks like one, and that’s where the confusion comes from. Here’s what’s really going on. 1. What a geodesic…
Amateurs use geodesic techniques to approximate a true paraboloid with many small, flat facets arranged on a spherical/geodesic framework, then “pulled” into a parabolic shape. The approach is popular because…
A full-scale Ewen (often spelled Ewan) hydrogen horn is a big structure, and most of the confusion comes from the fact that the horn geometry is well defined, but the…
https://www.astronomy.me.uk/wp-content/uploads/2026/01/Alex-Pettit-SDR-IFAv-Rinearn3D-130125.pdf
In September 2025, Jason Burnfield & myself delivered a workshop on creating and using a mini-far-field antenna testing range at home using a NanoVNA. Materials describing how this is done…
In the amateur radio astronomy community, the “biggest” horn antennas for 1420 MHz hydrogen line detection typically follow the design principles of historical and specialized academic projects, balancing size with…
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