How to make quarter-wave choke for a hydrogen-line cantenna
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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…
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…
Round cantenna and square pyramidal horn calculators available online
Links to two useful calculators below (I have nothing to do with these websites): https://3g-aerial.biz/en/online-calculations/antenna-calculations/cantenna-online-calculator https://www.everythingrf.com/rf-calculators/pyramidal-horn-antenna-gain-calculator
Can I use a square coaxial to waveguide adapter to act as waveguide on my 1.5m dish for hydrogen line?
Short answer: Yes — but with caveats. A square/coax-to-waveguide adapter can act as a waveguide feed/aperture for a 1.5 m dish at the hydrogen line, provided its internal dimensions support…