Hardware

Designing & Constructing a Cantenna (Circular Waveguide Antenna / Tuned Cylindrical Waveguide) for hydrogen line radio astronomy (1420 MHz)

Here is what you need to build your own Cantenna: Doing the math:Use an online calculator, such as the one at https://www.jefatech.com/products/cnfbst?keyword=cantenna, or https://www.changpuak.ch/electronics/cantenna.php, https://www.wikarekare.org/Antenna/WaveguideCan.html to check can size and…

Pyramidal Horn Calculator with examples for 1420 MHz hydrogen-line pyramidal horn build.

This calculator calculates the optimal dimensions of a Pyramidal Horn. Click on link below to see examples of calculation for hydrogen line radio observing (1420 MHz): https://www.astronomy.me.uk/wp-content/uploads/2025/12/Pyramidal-Horn-Calculator-with-examples-091225.pdf