Using large 4-5 metre mesh dishes for hydrogen line radio astronomy
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These mesh dishes are certainly fine for the Hydrogen line and are probably good up to about 3 or 5 GHz. If you want to learn more about the performance…
Radio Astronomy
Cantenna Design for Hydrogen Line Observations
A cantenna, essentially a form of circular waveguide, is a practical tool used in radio astronomy to detect the hydrogen line (1420.405 MHz). Here’s a comprehensive overview of its design…
Internet resources on hydrogen line radio astronomy
Here are some good internet resources — guides, tutorials, and reference material specifically useful for getting into hydrogen-line (21 cm, ~1420 MHz) radio astronomy: 📘 Amateur & Practical Guides •…
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
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
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
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
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
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
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