Radio observation in hydrogen line (1420MHz)

A choke can be added to a cantenna feed to improve performance by suppressing unwanted common-mode currents on the outside

This calculator calculates the optimal dimensions of a Pyramidal Horn. Click on link below to see examples of calculation for

Below is a complete, practical guide to designing and building a 1-metre-aperture horn antenna for 1420.405 MHz suitable for hydrogen-line work.

In normal retail use paint tins are not made of stainless steel. Here’s the breakdown: ✔ What paint tins are made of

Creating a geodesic dish can be an exciting project. These structures are efficient, robust, and aesthetically pleasing. Here’s a detailed

Short answer: maybe — but probably not the way you hope. Putting a smaller 2.5 L can inside a larger

Below is the simplest and most reliable way to add an effective quarter-wave choke to a hydrogen-line cantenna. This is a

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

Good question. In the UK, tins of paint come in a standard set of metric sizes.  Here’s roughly how diameter

Widest usable diameter for a hydrogen-line cantenna For a round “cantenna” (a short section of circular waveguide) working at the