SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)

Radio observation in hydrogen line (1420MHz) SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)

How do the dimensions of the hydrogen line horn made by SETI League & listed on astronomy.me.uk compare to the ones in https://lweb.cfa.harvard.edu/~npatel/hornAntennaAASposterPDF2.pdf and https://www.ece.mcmaster.ca/faculty/nikolova/antenna_dload/

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Here’s a side-by-side comparison of horn-antenna dimensions for hydrogen-line (≈1420 MHz, λ ≈ 21 cm) observation from SETI League / astronomy.me.uk recommendations and the academic designs referenced in the Harvard/McMaster…

Radio observation in hydrogen line (1420MHz) SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna) Waveguides

Show field patterns at 1420 MHz, derive wave impedance vs frequency, explain why feed probes behave oddly near cutoff, and compare WR-650 vs WR-770 specifically for H-line work.

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Excellent — I’ll go through all four, keeping it practical and tied to 1420.405 MHz H-line work with WR-650. 1. Field patterns in WR-650 at 1420 MHz For the dominant…

Radio observation in hydrogen line (1420MHz) SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna) Waveguides

Why do some websites describe WR-650 waveguides as being for frequencies higher than 1420 MHz? Give equations in ASCII format.

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Short answer: because different people are talking about different operating regions of the same waveguide, and some descriptions quietly assume single-mode, low-loss, well-matched operation rather than mere propagation. Here’s the…

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Radio observation in hydrogen line (1420MHz) SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)

The gain of a hydrogen horn or dish depends on its aperture which makes sense as bigger aperture means more light collected. But how does this work with a Yagi antenna tuned to hydrogen?