Geodesic Dome Dish Plans
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Creating a geodesic dish can be an exciting project. These structures are efficient, robust, and aesthetically pleasing. Here’s a detailed guide to help you plan and construct a geodesic dish.…
2025
I find that a 2.5 litre paint tin provides the 150mm diameter that seems to suit hydrogen line cantenna. Can I put it inside 5 litre paint tin so that 5 litre tin acts as choke on cantenna? I use the cantenna as waveguide.
Short answer: maybe — but probably not the way you hope. Putting a smaller 2.5 L can inside a larger 5 L can will change the electromagnetic environment of the…
How to make quarter-wave choke for a hydrogen-line cantenna
Below is the simplest and most reliable way to add an effective quarter-wave choke to a hydrogen-line cantenna. This is a standard method used on feedhorns to reduce spillover and…
Ideal diameter and length (or height) of cantenna for hydrogen line radio astronomy
For a hydrogen-line (1420.405 MHz) cantenna, the “ideal length” depends on which style of design you’re aiming for. A cantenna is really a short section of cylindrical waveguide, so its…
Diameter and height of 2.5 litre paint tins in UK
Good question. In the UK, tins of paint come in a standard set of metric sizes. Here’s roughly how diameter corresponds to size — and what you’d see that’s close…
What is widest diameter that works effectively for making hydrogen line cantennas?
Widest usable diameter for a hydrogen-line cantenna For a round “cantenna” (a short section of circular waveguide) working at the hydrogen line (1420.4 MHz), the widest internal diameter that still…
Accessible maser lines for amateur radio astronomers
For amateur-level radio astronomy, the most accessible astrophysical maser lines are those in frequency ranges where equipment is practical, affordable, and atmospheric attenuation is manageable. Here are the best options,…
WR-137 Waveguide and Masers
WR-137 waveguide covers roughly 5.8–8.2 GHz, which puts you squarely in C-band.That is an excellent range for amateur radio astronomy, because it includes one of the brightest and most accessible…
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
Waveguides
WR waveguide numbers and the frequency and wavelengths they cover for amateur adio astronomy projects
Here’s a practical WR waveguide reference table showing common WR numbers, their frequency range, and corresponding free-space wavelengths, and including a selection of sizes useful for radio astronomy and microwave…
Detecting masers associated an amateur radio astronomer
Amateur radio astronomers can indeed detect natural astrophysical masers, though the practical options are limited by sensitivity, equipment, and local regulations. Here’s a breakdown: 1. Hydrogen (H I) Masers 2. Hydroxyl…