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The Hydrogen Line Telescope Andrew Thornett 2025 Beneath the sky so vast and deep, Where ancient signals drift and sleep, A secret song from stars unknown— At 1420.405 MHz, it's shown. 1. The Dish or Aerial Wide First, you need to catch the light, But not in hues of day or night. A dish of parabola grand, To gather waves from distant land. 2. Waveguide’s Silent Flow A waveguide smooth and bright, Guides the whispers through the night. A metal tunnel, carved with care, To keep weak echoes trapped in air. 3. The LNA Stands Tall Next, a filter cold and keen, A low-noise preamp, crisp and clean. It lifts the whispers, makes them bold, Yet guards their form from growing cold. 4. The SDR's Keen Ear A software radio takes its place, To turn these waves to time and space. A digital heart that scans the past, To hear the hydrogen’s song at last. 5. The Computer’s Final Sight Now comes the code to draw the chart, To map the clouds that drift apart. A plot of peaks, a spectral line, Reveals the gas in curves so fine. The Universe in Silent Sound From all these parts, a scope is made, To pierce through time and gas that swayed. A whisper faint, yet clear and grand, From cosmic seas to guiding hand.

Hi Radio Astronomy Section Zoom Friday the 7th Feb 2025 Terrestrial Navigation from Cosmic Radiation by Jaron Samson Radio Frequency Systems Division ESTEC, European Space Agency Video is now on YouTube here You can find links to previous meeting videos and associated materials here Kind Regards John B

Sourcing a dish for H-Line observations can be a challenge in the UK. The link below may be useful if you are looking for one.... https://www.crowdsupply.com/krakenrf/discovery-dish The cost is about ?224 excluding taxes, shipping etc. -- ??? Paul Hearn ?? paul@... ?? RA Section Director ??

I am proposing to start an online Zoom series of sessions, to support people who would like to get started in hydrogen line (1420 MHz) radio observing. It will be aimed at folks who have never done this before, beginners but also more experienced radio astronomers who have never tried H-Line. This will be at a basic level, and will cover basic theory (I’m only a GP!), hardware and software, and then lead through helping folks to select what they would like to do and then the group will give support to its members as they embark on their first projects. This is intended for people who want to give it a go practically – expect the costs of purchasing materials for a project of this nature to be around ?200 plus you will need some form of computer which does not need to be powerful nor modern – I use 2nd hand mini-PCs, some people use Raspberry Pis, etc. At this stage, I would like to gauge whether there is any interest in this – so if it interests you then please email me on andrew (at) thornett (dot) net Andy Dr Andrew Thornett M6THO www.astronomy.me.uk

On holiday in Marrakech once I bought some magnetic rocks, said to be meteorites gathered in the desert, but on return home was told they were volcanic ejecta descending through the atmosphere. Andy g0sfj Yahoo Mail: Search, organise, conquer

Hi, I spotted this journal on a television programme from Al Maghribia TV in Morocco about meteorites in that country. https://onlinelibrary.wiley.com/journal/19455100 Best Regards, Mike.

Thankyou everyone who pointed out the correct syntax for our web address. Should be https://eucara.org/ Do take a look. The BAA Radio Astronomy Section with RAL Space are pleased to announce the EU Conference on Amateur Radio Astronomy. Further information and registration can be found at https://eucara.org/ This conference will be held at the Harwell and Science Innovation Centre, September 5th – 7th. We are delighted that Professor Jocelyn Bell Burnell will be our keynote speaker. This event will have speakers from academia and the amateur community. There will be posters and demonstrations. The event organisers are Paul Hearn and Andrew Thomas. -- ??? Paul Hearn ?? paul@... ?? RA Section Director ??

Hi, An interesting web page I found while researching into Siple Station VLF Whistler mode experiments. https://vlfstanford.ku.edu.tr/research/ Regards, Mike.

A lot of academic journals have moved to "open -source" which means that the writer pays quite a lot. But on top of this there are others who solicit research papers and then charge for publication . My spam folder is littered by them. Avoid! Andy Yahoo Mail: Search, organise, conquer

Hello everyone, i found an interesting article here, I was not aware of this phenomenon. “On ten NASA space shuttle missions, “electromagnetic plasmas” were observed in the thermosphere at an altitude of 320 kilometers above the earth.” I wonder, could our passive radar receive an echo of this? Here is the link: https://www.scirp.org/journal/paperinformation?paperid=131506 73 Josef DE3JGA

https://www.ebay.co.uk/itm/286243909797 Has anyone tried one of these at VLF? 73 de Andy g0sfj