Radio observation in hydrogen line (1420MHz)

If I use a filter at 1420 MHz that causes 3 dB loss and in amplifier beforehand that gives 3dB

A long Yagi antenna tuned for 1430 MHz can still work at 1420 MHz, but with reduced efficiency and some detuning effects.

These are the results so far of my mapping exercise with the 1.5m parabolic solar cooker dish (LRO-H2): Powerpoint Presentation

This version of the map has been relabelled, due to errors in the previous labelling system.

See Powerpoint below: https://www.astronomy.me.uk/wp-content/uploads/2025/05/Comparison-data-collection-peaks-on-LRO-H2-and-LRO-H3-23-240525.pptx

The ideal thickness (gauge) of copper wire for the feed in a cantenna (typically for Wi-Fi at 2.4 GHz) depends on

Link below takes you to web-page where you can compare the hydrogen line spectra you have detected with your radio

I used a screen recorder to record time-lapse of the ezCol screen over 24 hours then choose the frame with

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