Radio observation in hydrogen line (1420MHz)

A simple way to test an antenna with a NanoVNA involves connecting the antenna to the NanoVNA, calibrating the device using

I came across pictures of scaler rings for feedhorns and had a conversation with ChatGPT on whether such a ring

ChatGPT suggested following April 2025: Great — optimizing the feed for your 2 m dish at 1420 MHz will ensure you’re getting the most

The following comes from CHATGPT, when I asked it this question April 2025: Upgrading from a 1.5 m dish to a 2 m dish for observing

My new map (below). In this new map, I felt that only two arms (Perseus and Outer Arms) could be

https://www.astronomy.me.uk/wp-content/uploads/2025/04/ezRA_ProgramsData_from_LRO-H1_RT_250425.zip

At last, successfully got this working! 13-element Patch Yagi tuned to 1420 MHz by Alex Pettit from USA (member of

My latest attempt to generate a map of the Milky Way at hydrogen line 1420.405 MHz on LRO-H2 radio telescope.

I used cable ties to locate centre of opening of cantenna waveguide = I tested them in microwave – only