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…
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
Note some of the following is based on AI search results and has not been fully confirmed. So please check other data sources before using this content in your own…
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…
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