Radio observation in hydrogen line (1420MHz)

Evidence for dark matter comes from multiple, independent lines of observation across astrophysics and cosmology. Here are the main ones:

Reducing noise in a 1420 MHz radio telescope setup (i.e., for detecting the hydrogen line) involves addressing both internal and

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