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…
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 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…
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…
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…
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
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…
It happens because “WR-650” means two completely different things depending on context, and most search engines don’t know which one you want. 1. The actual WR-650 (large waveguide) is for…
If you want a rectangular waveguide that works well around 1.4 GHz, a common standard choice is WR650. ✅ Why WR650 at ~1.4 GHz ⚠️ What you lose by going too small…
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