Principals of design of geodesic radio dish
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Radio observation in hydrogen line (1420MHz)
Does a geodesic dome naturally form a parabola? (Relevant to design of geodesic parabolic radio astronomy dish)
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…
One design for making parabolic radio astronomy dishes is to use a geodesic design – how do amateurs make a parabolic dish using this?
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…
If I want to make full scale Ewan hydrogen horn what dimensions should I use for all pieces of wood that form struts?
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…
Alex Pettit: Advantages of process of using SDR# with IFAverage plug-in, and Rinearn-3D for analysis of hydrogen line data 13/1/2025
https://www.astronomy.me.uk/wp-content/uploads/2026/01/Alex-Pettit-SDR-IFAv-Rinearn3D-130125.pdf
Attending & talking at conferences, workshops & societies
NanoVNA
Radio observation in hydrogen line (1420MHz)
NanoVNA Mini-far-field antenna range from EuCARA Sept 2025
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…
Biggest amateur hydrogen line horn antennas
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…
Is there any advantage to making a cantenna feed where the sides are not parallel?
Short answer: usually no for a classic cantenna, but yes in specific variants. Why standard cantennas use parallel sides A conventional cantenna is a cylindrical waveguide designed to support the…
Alex Pettit: SDR# > IFavg > HL3D > Rinearn-3D for Hydrogen Line Radio Astronomy
Useful information from Alex Pettit: H-Line 3D (HL3D) does following: 1) takes theIFavg file set, analyses the drift and slope of each file at ( user specified ) non H…