What is a Power User?
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A power user is someone who uses a product, system, or piece of software far beyond basic or casual use, taking advantage of its advanced features, shortcuts, customizations, and integrations…
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How starquakes allow astronomers to determine a star’s age
Astronomers determine a star’s age using starquakes through a technique called asteroseismology. The basic idea is that a star’s internal structure changes in a predictable way as it ages, and…
Comparing H-Line Cantenna Dimensions different diameters of the can
Key messages from above table: The probe length does not change with cantenna diameter at the same design frequency. The overall can length goes down with increase in diameter. The…
Calculating dimensions for 1420 MHz hydrogen line cantenna to use as waveguide for 150cm dish
The following calculations were developed with help of the calculator at https://3g-aerial.biz/en/online-calculations/antenna-calculations/cantenna-online-calculator
SETI League Excel Spreadsheet Templates (Calculators)
A ZIP file of the entire set of calculators from the SETI League website 1/1/2026. https://www.astronomy.me.uk/wp-content/uploads/2026/01/SETI-League-Excel-Spreadsheet-Templates-Calculators.zip
Suggested dimensions for a 3 metre H-Line Aperture Horn Antenna
These may be debated by other builders……note I haven’t built this sized horn so cannot demonstrate its effectiveness – rather, this is my attempt to calculate the dimensions needed. https://www.astronomy.me.uk/wp-content/uploads/2026/01/Optimal-dimensions-of-3m-H-Line-Aperture-Horn-Antenna.pdf
Notes on SETI-style “Horn of Plenty” horn antenna tuned to H-Line
https://www.astronomy.me.uk/wp-content/uploads/2026/01/Notes-on-SETI-style-Horn-of-Plenty-horn-antenna-tuned-to-H-Line.pdf
Designing my SETI H-Line Horn of Plenty 31/12/2025
From SETI League on building Horn of Plenty: https://www.astronomy.me.uk/wp-content/uploads/2026/01/10629-scaled.jpg https://www.astronomy.me.uk/wp-content/uploads/2026/01/Building-SETI-Horn-of-Plenty2003.docx SETI League Feedhorn Excel Spreadsheet Calculator: https://www.astronomy.me.uk/wp-content/uploads/2026/01/SETI-League-Feedhorn-Analysis-Excel-Calulator.xls Design for my own Horn of Plenty using diagrams and photos from SETI…
Calculating Cantenna Dimensions Talk for BAA Hydrogen Line Sub0group meeting 5/1/2026
https://www.astronomy.me.uk/wp-content/uploads/2025/12/Calculating-Cantenna-Dimensions-for-H-Line-Meeting-050126-DRAFT-301225@2330.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/12/Calculating-Cantenna-Dimensions-for-H-Line-Meeting-050126-DRAFT-301225@2330.pptx
Testing antenna aimed at cold sky vs hot ground – can this be conducted in daytime or must it be done at night?
QUESTION:Testing antenna aimed at cold sky vs hot ground – can this be conducted in daytime or must it be done at night i.e. does sunshine or even sun behind…