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…
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…
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…
Dimensions of the commercial rectangular WR650 feed I purchased off ebay Dec 2025 are 164mm wide x 82mm high x 128mm deep, with monopole probe located 57mm from back plane.
Process for installation on a your PC – this PC will be wiped by this process so ensure it does not contain data you wish to preserve. This image was…
This design is called a coudé telescope (often written coudé focus). In a coudé system, mirrors redirect the light down the mount or pier so the eyepiece or instrument stays…
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