Radio Astronomy
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Designing tuneable LRO aluminium stove pipe cantenna H-Line 16/1/2025
Making tuneable length monopole to maximise cantenna waveguide function: As can be seen in photo below, I have purchased a threaded copper sleeve (sold as brass coupling nuts) and a…
Plan and measurements of proposed LRO Hydrogen Line Horn Antenna 14/1/2026
https://www.astronomy.me.uk/wp-content/uploads/2026/01/Plan-Measurements-for-LRO-Horn-of-Plenty-140126.pdf
Small Hydrogen Line Radio Telescope Background Drift/Shift – Dark Frame Correction
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
Principals of design of geodesic radio dish
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…
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…