Evidence for existence of dark matter
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Evidence for dark matter comes from multiple, independent lines of observation across astrophysics and cosmology. Here are the main ones: 1. Galaxy Rotation Curves 2. Gravitational Lensing 3. Cosmic Microwave…
Radio observation in hydrogen line (1420MHz)
Reducing noise in radio telescope systems
Reducing noise in a 1420 MHz radio telescope setup (i.e., for detecting the hydrogen line) involves addressing both internal and external sources of interference. Here are the most effective steps…
Can 3dB amplifier compensate for 3dB loss in filter at 1420MHz?
If I use a filter at 1420 MHz that causes 3 dB loss and in amplifier beforehand that gives 3dB gain, will that cancel it out? Not exactly — a…
Using long Yagi antenna tuned for 1430 MHz for 1420 MHz
A long Yagi antenna tuned for 1430 MHz can still work at 1420 MHz, but with reduced efficiency and some detuning effects. Here’s a breakdown of what you can expect:…
Results LRO-H2 Mapping exercise 11/4/2025-1/6/2025 (processed 1/6/2025)
These are the results so far of my mapping exercise with the 1.5m parabolic solar cooker dish (LRO-H2): Powerpoint Presentation containing slides at bottom of this page: https://www.astronomy.me.uk/wp-content/uploads/2025/06/Results-LRO-H2-Mapping-exercise-110425-010625-010625.pptx Individual slides:
LRO-H1 Map 2 (cf Wikipedia H-Line Map July 2024 proc 260425@2200) – labelled
This version of the map has been relabelled, due to errors in the previous labelling system.
Easy Radio Astronomy Software (ezRA)
LRO-H3 Radio Telescope (Alex Pettit H-Line Yagi)
Radio observation in hydrogen line (1420MHz)
Comparison of size of peaks on ezCol (ezRA) from LRO-H2 and LRO-H3 in last few days
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
Ideal thickness for copper feed for cantenna at 1420 Mhz
The ideal thickness (gauge) of copper wire for the feed in a cantenna (typically for Wi-Fi at 2.4 GHz) depends on both practical and theoretical factors, mainly skin depth, mechanical…
Hi Profile Search
Link below takes you to web-page where you can compare the hydrogen line spectra you have detected with your radio telescope with more professional results. Andy https://www.astro.uni-bonn.de/hisurvey/euhou/LABprofile
Attending & talking at conferences, workshops & societies
NanoVNA
Radio observation in hydrogen line (1420MHz)
Making a 2nd cantenna for the antenna testing range in the NanoVNA workshop at EUCARA 2025
In September 2025, EUCARA is being held at Harwell Campus in UK. I am giving a talk and also running an introductory workshop on using NanoVNAs to test antennae/aerials. As…